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Статті в журналах з теми "Irradiation par ion"
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Han, X. G., J. F. Lv, Y. Z. Chen, Y. C. Shan, and J. J. Xu. "Influence of irradiation intensity on corrosion properties of microarc oxidation film on AZ31 magnesium alloy with HIPIB." Anti-Corrosion Methods and Materials 66, no. 4 (July 1, 2019): 418–24. http://dx.doi.org/10.1108/acmm-10-2018-2007.
Повний текст джерелаАнотація:
Purpose The purpose of this paper is to investigate the effect of high-intensity pulsed ion beam (HIPIB) intensity on the structure and corrosive properties of microarc oxidation (MAO) films on AZ31 magnesium alloy and explore the mechanism for modified anti-corrosion properties of irradiated films. Design/methodology/approach The energy deposited on the coating surface influences the remelting process of the MAO coatings significantly, which was closely related to the intensity of HIPIB; therefore, HIPIB with various intensities of 100-350 A/cm2, was selected to modify the MAO films on AZ31 magnesium alloy. The changes in film structure and phase structure of modified films were characterized by scanning electron microscopy and X-ray diffractometry (XRD) with CuKα, respectively. The corrosive behavior of the MAO films was featured with polarization curves and electrochemical impedance spectrum in 3.5 per cent NaCl solution on a PAR 2273 electrochemical workstation. Findings The results clearly show that a dense, continual and remelted layer with a few micrometers in thickness was obtained on the irradiated surface at 200 A/cm2, which are mainly responsible for the modified and optimal anti-corrosion property of MAO films by suppressing/retarding the process of the corrosive electrolyte infiltration into magnesium substrate surface. Originality/value The paper reveals that HIPIB irradiation could modify the corrosion resistance by producing a remelted compact layer on the MAO film surface at a suitable irradiation parameter and explored the modified mechanism of MAO films.
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Gnaser, Hubert. "Nanostructures on surfaces by ion irradiation." Pure and Applied Chemistry 83, no. 11 (July 17, 2011): 2003–25. http://dx.doi.org/10.1351/pac-con-11-03-05.
Повний текст джерелаАнотація:
The bombardment of the surface of a solid by energetic ions often results in pronounced surface modifications, leading to characteristic topographical features. In this report, the development of specific morphological nanostructures on surfaces under ion irradiation is discussed. The following aspects will be emphasized: (i) on an atomic scale, the generation of isolated defects such as adatoms and surface vacancies due to single-ion impacts, and their possible clustering; (ii) the transition from such individual defects toward extended morphological features on the surface and suitable scaling relations to describe them; (iii) the formation of highly periodic structures with nanoscale dimensions such as nanodots and “ripple”-like features, and the dependence of these nanostructcures on various ion-irradiation parameters and substrate materials; (iv) the theoretical concepts proposed to model the observed patterns which are thought to be related to (and caused by) the interplay between ion erosion and diffusion of adatoms (vacancies), thus inducing a surface reorganization.
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Milosavljević, Srdjan, Djordje Lazarević, Koviljka Stanković, Milić Pejović, and Miloš Vujisić. "Effects of Ion Beam Irradiation on NanoscaleInOxCooper-Pair Insulators." International Journal of Photoenergy 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/236823.
Повний текст джерелаАнотація:
This paper examines the effects of irradiating indium oxide films of nanoscale thickness by ion beams, when these films are in the Cooper-pair insulator state. Radiation effects are predicted on the basis of Monte Carlo simulations of ion transport. Results of numerical experiments are interpreted within the theoretical model of a Cooper-pair insulator. The study suggests that radiation-induced changes inInOxfilms exposed to ion beams could significantly alter their current-voltage characteristics and that a transition to a metallic state is possible, due to radiation-induced perturbation of the fine-tuned granular structure. Furthermore, incident and displaced ions can break up enough Cooper pairs inInOxfilms to cause dissolution of this specific insulating state.
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Jung, Chan-Hee, In-Tae Hwang, Ho-Je Kwon, Young-Chang Nho, and Jae-Hak Choi. "Patterning of cells on a PVC film surface functionalized by ion irradiation." Polymers for Advanced Technologies 21, no. 2 (April 12, 2009): 135–38. http://dx.doi.org/10.1002/pat.1437.
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Sharma, Swati, Mausumi Mukhopadhyay, and Zagabathuni Venkata Panchakshari Murthy. "Photolytic degradation of chlorophenols from industrial wastewaters by organic oxidants peroxy acetic acid, para nitro benzoic acid and methyl ethyl ketone peroxide: identification of reaction products." Water Science and Technology 69, no. 6 (January 2, 2014): 1259–66. http://dx.doi.org/10.2166/wst.2014.001.
Повний текст джерелаАнотація:
In this investigation, chlorophenol (CP) containing industrial wastewater was remediated by ultraviolet irradiation in conjunction with organic oxidants, peroxy acetic acid (PAA); para nitro benzoic acid (PNBA); and methyl ethyl ketone peroxide (MEKP). CP mineralization was studied with regard to chemical oxygen demand (COD) and chloride ion release under identical test conditions. COD depletion to the extent of 81% by PAA, 66% by PNBA, and 67% by MEKP was noted along with an upwardly mobile trend of chloride ion release upon irradiation of samples at 254 nm. A 90–99% decrease in CP concentration (as per high pressure liquid chromatography (HPLC) analysis) was achieved with an additional 15.0 ml of organic oxidant in all cases. Gas chromatography high resolution mass spectroscopy (GC-HRMS) results also indicated the formation of such reaction products as are free from chlorine substitutions. This treatment also leads to total decolorization of the collected samples.
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KUKSENOVA, L. I., and D. A. KOZLOV. "ALLOYING THE SURFACE OF STEEL 30KHGSN2A TO INCREASE ITS TRIBOLOGICAL CHARACTERISTICS." Fundamental and Applied Problems of Engineering and Technology 4, no. 2 (2020): 55–60. http://dx.doi.org/10.33979/2073-7408-2020-342-4-2-55-60.
Повний текст джерелаАнотація:
The results of evaluating the wear of samples of the model of the same name pair of friction from alloy steel 30KhGSN2A after ion beam treatment and dry friction under conditions of heavy contact are presented. It was shown that in the steady state friction, the wear resistance of steel as a result of implantation of copper ions at an irradiation dose of 1017 ion / cm2 and 5.1017 ion / cm2 increases by 2 and 1.5 times, respectively. The mechanism of the «long-range effect» in ion-doped structural materials under conditions of contact deformation is discussed.
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Chen, Tao, Junfeng Zhen, Ying Wang, Harold Linnartz, and Alexander G. G. M. Tielens. "Photodissociation processes of Bisanthenquinone cation." Proceedings of the International Astronomical Union 13, S332 (March 2017): 353–59. http://dx.doi.org/10.1017/s1743921317007864.
Повний текст джерелаАнотація:
AbstractA systematic study, using ion trap time-of-flight mass spectrometry, is presented for the photo-dissociation processes of Bisanthenquinone (Bq) cations, C28H12O2+, a ketone substituted Polycyclic Aromatic Hydrocarbon (PAH). The Bq cation fragments through sequential loss of the two neutral carbonyl (CO) units upon laser (626nm) irradiation, resulting in a PAH-like derivative C26H12+. Upon further irradiation, C26H12+ exhibits both stepwise dehydrogenation and C2/C2H2 loss fragmentation channels. Quantum chemistry calculations reveal a detailed picture for the first CO-loss, which involves a transition state with a barrier of ∼ 3.4 eV, which is lower than the energy required for the lowest H-loss pathway (∼ 5.0 eV). The barrier for the second CO-loss is higher (∼ 4.9 eV). The subsequent loss of this unit changes the Bq geometry from a planar to a bent one. It is concluded that the photodissociation mechanism of the substituted PAH cations studied here is site selective in the substituted subunit. This work also shows that an acetone substituted PAH cation is not photo-stable upon irradiation.
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Feng, Xin, Xinwei Li, Wen Cui, Fan Dong, and Tierui Zhang. "An ion-exchange strategy for I-doped BiOCOOH nanoplates with enhanced visible light photocatalytic NOx removal." Pure and Applied Chemistry 90, no. 2 (February 23, 2018): 353–61. http://dx.doi.org/10.1515/pac-2017-0509.
Повний текст джерелаАнотація:
Abstract A simple ion-exchange method was developed for I-doped BiOCOOH nanoplates from the replacement of COOH− ions with I− ions in the interlayers of BiOCOOH. The as-prepared catalysts were characterized by XRD, SEM, TEM, XPS, UV-vis DRS PL and photocurrent generation. The photocatalytic activity of the as-prepared catalysts was evaluated by removal of NO in air at ppb level under visible light irradiation. As expected, the I-doped BiOCOOH (IHB-X, the X represents the molar ratio of KI to BiOCOOH) displayed increased visible light absorption and enhanced charge separation due to I-doping. At a saturate I-doping content, the IHB-1.00 catalyst with optimized electronic structure demonstrated the highest NO removal of 49.7% and excellent photochemical stability. This present work has demonstrated a new strategy for modification of layered photocatalyst via ion exchange.
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Hiruma, Hitomi, Shoichiro Asayama, and Hiroyoshi Kawakami. "Control of cell morphology on the polyimide surface patterned by rubbing and ion-irradiation." Polymers for Advanced Technologies 22, no. 8 (April 25, 2011): 1311–14. http://dx.doi.org/10.1002/pat.1949.
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Holdsworth, Eccles, Rowbotham, Bond, Kavi, and Edge. "The Effect of Gamma Irradiation on the Ion Exchange Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites under Spent Fuel Recycling Conditions." Separations 6, no. 2 (April 24, 2019): 23. http://dx.doi.org/10.3390/separations6020023.
Повний текст джерелаАнотація:
The caesium radioisotopes 134Cs, 135Cs, and 137Cs are highly problematic medium-lived species produced during nuclear fission, due to their high radioactivity and environmental mobility. While many ion exchange materials can readily isolate Cs+ ions from neutral or basic aqueous solutions, only ammonium phosphomolybdate (AMP) functions effectively in acidic conditions, removing caesium even down to trace levels. Composites of AMP in a porous polymeric support such as polyacrylonitrile (PAN) can be used to selectively remove Cs+ ions from acidic aqueous decontamination liquors as well as other liquid wastes, and are promising for the isolation of Cs+ isotopes in spent fuel reprocessing. While both AMP and PAN have demonstrable acid stability, and PAN has known resistance to gamma radiation, AMP-PAN composites have received only a limited analysis of their physiochemical and ion exchange performance following irradiation. In this publication, we explore the effect of high levels of gamma irradiation on the ion exchange properties of AMP and AMP-PAN as a Cs+-selective adsorbent under spent fuel dissolver liquor concentrations and acidity. We demonstrate no significant reduction in performance with respect to uptake kinetics or capacity upon irradiation, abiding by the same absorption mechanism observed in the established literature.
Дисертації з теми "Irradiation par ion"
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Barberet, Philippe. "Développement d'une ligne d'irradiation microfaisceau en mode ion par ion pour la radiobiologie expérimentale à l'échelle cellulaire." Bordeaux 1, 2003. http://www.theses.fr/2003BOR12708.
Повний текст джерелаАнотація:
Un dispositif micro-irradiation par ions isolés a été développé au CENBG pour des applications en radiobiologie à lé́chelle cellulaire. Cette installation consiste en un aménagement de la ligne microfaisceau préexistante qui permet déjà d'obtenir un faisceau de protons ou de particules alpha entre 1 et 3 MeV, de faible intensité, et d'une résolution spatiale sous vide inférieure au micromètre. La majeure partie de ce travail a consisté à développer un étage d'irradiation adaptable sur la microsonde et permettant de délivrer les ions à l'air avec une précision absolue de quelques micromètres. Un programme permettant le contrôle de la totalité des instruments ainsi que des phases d'étalonnage et d'irradiation automatiquess a également été mis au point. Des outils de simulation Monte carlo, nécessaires à la caractérisation et à l'optimisation du dispositif et notamment en terme de résolution spatiale, ont été validés à l'échelle du micromètre par comparaison à des résultats exp̀érimentaux. Les performances du dispositif, notamment en terme de contrôle du nombre d'ions, de résolution spatiale et de précision d'irradiation ont été testées sous faisceau. Les résultats obtenus permettent d'envisager les premières applications dans des études de radiobiologie. Dans un futur proche cet outil va permettre l'étude des réponses cellulaires aux faibles doses, allant jusqu'au cas extrème d'un ion pour une cellule. Il devrait permettre par ailleurs d'aborder des mécanismes cellulaires fondamentaux tels la signalisation, la communication intercellulaire ou encore la mort cellulaire programmée (apoptose).
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Lin, Jun. "Radiation-induced alterations in mesoporous silicas : The effect of electronic processes involving ions and electrons." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2022. http://theses.enscm.fr/ENSCM_2022_LIN.pdf.
Повний текст джерелаАнотація:
Les matériaux utilisés dans le nucléaire (combustible, matrice de conditionnement, matériaux de structure…) sont soumis à des contraintes importantes liées à la création de défauts qui modifient leurs propriétés. Plusieurs études ont montré que les interfaces peuvent agir comme un puits pour les défauts causés par l'irradiation, ce qui suggère que les nanomatériaux pourraient avoir une plus grande résistance à l'irradiation que les matériaux présentant une structure « micrométrique ». Par ailleurs, les silices mésoporeuses ont gagné en popularité ces dernières années et sont envisagées pour le traitement des effluents radioactifs (séparation, conditionnement…). Bien que de nombreuses études aient été réalisées sur le comportement de silices non poreuses sous irradiation, très peu de travaux s’intéressent à celui de la silice mésoporeuse en particulier lorsqu’elle est irradiée en régime d‘électronique.Le but de cette thèse est de comprendre et d'expliquer les modifications induites par irradiation dans les silices mésoporeuses en régime électronique. Ce travail a permis de quantifier l’évolution de propriétés physico-chimiques (polymérisation du réseau, création de défauts…) et structurales (volume poreux, diamètre et distribution des pores…) de la silice mésoporeuse irradiée par des faisceaux d'ions de haute énergie dans une gamme de pouvoirs d'arrêt variant entre 1 keV/nm et 12 keV/nm, ainsi que par des électrons (10 - 300 keV et 0.6 - 2.4 MeV). Des méthodes de caractérisation post-irradiation (réflectivité des rayons X, adsorption de gaz, SAXS et FTIR, etc.) ont été utilisées, ainsi que le suivi in situ de la structure des pores à l'aide de microscopie électronique. Les résultats expérimentaux ont indiqué que la structure des pores était sensible à l'irradiation conduisant dans certaines conditions à son effondrement, tandis que le réseau de silice lui-même évolue peu par rapport à la silice non poreuse. Parallèlement, un modèle TS3D (modèle de pointe thermique 3D) a été utilisé avec succès pour décrire et expliquer le comportement de contraction des pores observé en réponse à l'irradiation ionique. De plus, le mécanisme de contraction des pores sous irradiation par des électrons a été délimité en fonction du domaine des énergies incidentes des électrons et de la dose. Cette recherche a montré que par rapport à une silice non poreuse, la présence de pores nanométriques réduit l’accumulation des dommages causés par les irradiations. Conjointement à cet effet bénéfique, le pore se contracte jusqu’à disparaitre sous l’impact de l’irradiation. Par conséquent, d’un point de vue applicatif cette caractéristique pourrait être mise à profit pour imaginer de nouvelles voies de traitement des effluents radioactifs, par une stratégie de type « séparation/conditionnement » ou pour l'autoguérison des couches de gel poreux formées à la surface des colis de déchets vitrifiés dont l’exutoire envisagé est le stockage géologique profondMaterials used in nuclear energy (fuel, packaging matrix, structural materials...) are subject to significant stresses due to the creation of defects that modify their properties. Several studies have shown that interfaces can act as a sink for defects caused by irradiation, which suggests that nanomaterials could have a higher resistance to irradiation than materials with a "micrometric" structure. Simultaneously, mesoporous silica materials have grown in popularity in recent years and are becoming more involved in the domain related to radiation conditioning, such as the prospective use of conditioning for nuclear waste. While research has begun to focus on the behavior of non-porous silica materials when exposed to radiation, no extensive investigations have been conducted on the behavior of mesoporous silica when exposed to radiation, particularly at electronic irradiation regime.This thesis aims to comprehend and explain the radiation-induced changes in mesoporous silicas under electronic regimes. This work quantified the evolution of physical (pore volume, pore diameter and distribution...) and structural (polymerization of the network, creation of defects...) properties of mesoporous silica irradiated with high-energy ion beams with stopping powers ranging from 1 keV/nm to 12 keV/nm, and with electron beams (10 - 300 keV and 0.6 - 2.4 MeV). Post-irradiation characterization methods (X-ray reflectivity, gas adsorption, SAXS, FTIR, etc.) have been used, as well as in-situ pore structure monitoring using electron microscopes. The experimental findings indicated that pore structures were susceptible to a certain degree of irradiation-induced shrinking. In contrast, evidence shows that the silica network itself does not alter much in porous silica compared to non-porous silica. Meanwhile, a 3DTS (3D thermal spike) model has been successfully applied to describe and explain the observed pore contraction behavior in response to ionic irradiation. Additionally, the mechanism of pore contraction under electron irradiation has been delineated according to the domain of incident electron energies. When compared to non-porous silica, this research has demonstrated that the existence of nanoscale pores reduces the accumulation of damage induced by irradiation. In conjunction with this effect, the pore contracts until it completely disappears under the impact of irradiation. This characteristic could, from an applicative point of view, be of interest to practitioners in the context of new methods of treating radioactive effluents, such as through the use of a "separation/conditioning" strategy, or in the context of the self-healing of porous gel layers formed on the surface of vitrified waste packages whose final destination is deep geological disposal
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Bachiller, Perea Diana. "Ion-Irradiation-Induced Damage in Nuclear Materials : Case Study of a-SiO₂ and MgO." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS158/document.
Повний текст джерелаАнотація:
Un des plus grands défis de la Physique aujourd’hui est de créer une source d’énergie propre, durable et efficace qui puisse satisfaire les besoins de la société actuelle et future avec le minimum d’impact sur l’environnement. Dans ce cadre, un grand effort de recherche internationale est dévoué à l’étude de nouveaux systèmes de production d’énergie ; réacteurs de fission de Génération IV et réacteurs de fusion nucléaire sont en particulier en train d’être développés. Les matériaux utilisés dans ces réacteurs seront soumis à des hauts niveaux de radiation, ce qui rend nécessaire l’étude de leur comportement sous irradiation pour permette le succès du développement de ces nouvelles technologies. Dans cette thèse, deux matériaux ont été étudiés : la silice amorphe (a-SiO₂) et l’oxyde de magnésium (MgO). Ces deux matériaux sont des oxydes isolants avec des applications dans l’industrie de l’énergie nucléaire. Des irradiations avec des ions de haute énergie ont été réalisées sur différentes plateformes d’accélérateurs d’ions pour induire l’endommagement de ces deux matériaux par irradiation ; ensuite, les mécanismes d’endommagement ont été caractérisés en utilisant, principalement, des techniques d’analyse par faisceau d’ions (techniques IBA).Un des objectifs de cette thèse était de développer la technique d’ionoluminescence (qui est une technique IBA très peu connue) et de l’appliquer à l’étude des mécanismes d’endommagement par irradiation des matériaux, démontrant alors le potentiel de cette technique. L’ionoluminescence de trois types différents de silice (avec des différentes teneurs en OH) a ainsi été étudiée en détail et utilisée pour décrire la création et l’évolution des défauts ponctuels sous irradiation. Dans le cas de MgO, l’endommagement produit par irradiation avec des ions Au⁺ à 1.2 MeV a été caractérisé en utilisant la technique de spectrométrie de rétrodiffusion Rutherford en configuration de canalisation et la diffraction des rayons X. Finalement, l’ionoluminescence de MgO sous différentes conditions d’irradiation a aussi été étudiée. Les résultats obtenus dans cette thèse aident à comprendre les processus d’endommagement par irradiation dans les matériaux, ce qui est indispensable pour le développement de nouvelles sources d’énergie nucléaireOne of the most important challenges in Physics today is the development of a clean, sustainable, and efficient energy source that can satisfy the needs of the actual and future society producing the minimum impact on the environment. For this purpose, a huge international research effort is being devoted to the study of new systems of energy production; in particular, Generation IV fission reactors and nuclear fusion reactors are being developed. The materials used in these reactors will be subjected to high levels of radiation, making necessary the study of their behavior under irradiation to achieve a successful development of these new technologies. In this thesis two materials have been studied: amorphous silica (a-SiO₂) and magnesium oxide (MgO). Both materials are insulating oxides with applications in the nuclear energy industry. High-energy ion irradiations have been carried out at different accelerator facilities to induce the irradiation damage in these two materials; then, the mechanisms of damage have been characterized using principally Ion Beam Analysis (IBA) techniques. One of the challenges of this thesis was to develop the Ion Beam Induced Luminescence or ionoluminescence (which is not a widely known IBA technique) and to apply it to the study of the mechanisms of irradiation damage in materials, proving the power of this technique. For this purpose, the ionoluminescence of three different types of silica (containing different amounts of OH groups) has been studied in detail and used to describe the creation and evolution of point defects under irradiation. In the case of MgO, the damage produced under 1.2 MeV Au⁺ irradiation has been characterized using Rutherford backscattering spectrometry in channeling configuration and X-ray diffraction. Finally, the ionoluminescence of MgO under different irradiation conditions has also been studied.The results obtained in this thesis help to understand the irradiation-damage processes in materials, which is essential for the development of new nuclear energy sources
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Garric, Victor. "Etude du gonflement par cavités d'un alliage d'aluminium irradié sous faisceau d'ions." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI091.
Повний текст джерелаАнотація:
L’alliage d’aluminium 6061-T6 (Al-Mg-Si), choisi pour la conception du caisson et du casier du réacteur Jules Horowitz (RJH), doit ses propriétés mécaniques au durcissement structural T6 induit par une précipitation nanométrique : une mise en solution suivie d’une trempe et d’un revenu. En raison de l’épaisseur des composants, la vitesse de trempe obtenue sur les éléments d’un réacteur expérimental est plus faible que celle des pièces fines couramment étudiées. Afin d’étudier l’effet de la vitesse de trempe sur la microstructure et le comportement sous irradiation, trois cubes de 10 cm de côté d’alliage 6061 ont subi un traitement T6 dans trois conditions de trempe (eau, huile, air). A la suite de ces traitements, une caractérisation microstructurale et mécanique a été réalisée sur chaque état.La contribution au gonflement de l’aluminium des cavités qui se forment sous flux de neutrons rapides est mal connue. Par des irradiations ioniques de lames MET à différents niveaux d’endommagement (entre 15 dpa et 100 dpa), une évaluation des modifications microstructurales suivie d’une quantification du gonflement et d’une modélisation a été entreprise.Des irradiations en triple faisceau (W, He, Si) permettant de cumuler les dommages avec l’implantation d’éléments produits en réacteur par transmutation de l’aluminium, ont montré que l’implantation de silicium conduit à l’apparition d’une nouvelle phase riche en Si. En simple faisceau d’ions lourds (Au), les cavités se localisent autour des défauts linéaires et des dispersoïdes, mais en présence d’hélium elles apparaissent aussi réparties dans toute la matrice. Compte tenu des fortes teneurs en hélium implanté, les mesures quantitatives du gonflement ont été réalisées sur les lames irradiées en simple faisceau.Le gonflement mesuré, plus élevé que sous flux neutronique, a conduit à considérer pour la modélisation deux séries de données (ions/neutrons). Les bases d’une modélisation du gonflement par cavités ont été posées, et les paramètres physiques restant à déterminer ont été identifiés6061-T6 (Al-Mg-Si) aluminum alloy chose for the core of the Jules Horowitz Reactor (JHR) benefits from the T6 structural hardening induced by nanoprecipitates formed after an annealing followed by a quench and an artificial ageing. Because of the thickness of reactor parts, the quench rate is far slower than what is commonly seen on usual thin plates. In order to study the influence of the quench on the microstructure and the behavior under irradiation, three 10 cm side cubes of 6061 alloy have been tempered with a T6 treatment in three different quenching conditions (water, oil and air). Treatment have been followed by microstructural investigations on each temper.The contribution of voids, formed under fast neutron flux, to the global swelling of the alloy is poorly known. Using ion irradiation on bulk TEM samples at different damage levels (from 15 dpa to 100 dpa), microstructural evolutions have been characterized and swelling has been both quantified and modeled.Triple beam irradiations (W, He, Si) alloying to obtain a consistent damage level while implanting fission products (Si, He) showed silicon implantation lead to the precipitation of a new Si enriched phase. Simple beam irradiations (Au), showed voids are localized around linear defects and dispersoïds. Implantation of helium lead to a homogeneous distribution of bubbles in the whole matrix. Acknowledging the very high dose of helium implanted, quantitative measurements of swelling has been performed exclusively on single beam irradiated samples.The measured swelling, higher than what has been observed under neutron flux, lead to consider two series of data (ions and neutrons) in order to model the swelling. The base of a swelling model has been performed and the remaining physical parameters to determine were identified
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Vianna, François. "Micro-irradiation ciblée par faisceau d'ions pour la radiobiologie in vitro et in vivo." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0030/document.
Повний текст джерелаАнотація:
Les microfaisceaux d’ions ont, au cours de ces dernières décennies, montré leur efficacité dansl’étude des effets des rayonnements ionisants sur le vivant notamment concernant les effets des faiblesdoses ou l’étude de l’effet de proximité. Le CENBG dispose depuis 2003 d’un dispositif permettant la micro-irradiation ciblée d’échantillons biologiques vivants. Les applications des microfaisceaux dans ce domainese sont récemment diversifiées et des études plus fines sur les mécanismes de réparation desdommages ADN radio-induits aux échelles cellulaire et multicellulaire sont devenues possibles via lesévolutions en imagerie par fluorescence et en biologie cellulaire. Ces approches ont nécessité une évolutionimportante de l'instrumentation de la ligne de micro-irradiation du CENBG qui a été entièrementredessinée et reconstruite dans un souci d’optimisation d’apport de nouvelles fonctionnalités. Les objectifsde mes travaux ont été i) la mise en service du dispositif, ii) la caractérisation des performances dusystème, iii) la mise en place de protocoles pour l’irradiation ciblée à dose contrôlée aux échelles cellulaireet multicellulaire, in vitro et in vivo, et le suivi en ligne des conséquences précoces de cette irradiation,iv) la modélisation des irradiations afin d’interpréter les observables biologiques au regard des donnéesphysiques calculées.Ces travaux ont permis i) de caractériser les performances du dispositif : une taille de faisceau d’environ2 μm sur cible et une précision de tir de ± 2 μm, de développer des systèmes de détection d’ions pour uncontrôle absolu de la dose délivrée, ii) d’induire des dommages ADN fortement localisés in vitro, et devisualiser en ligne le recrutement de protéines impliquées dans la réparation de ces dommages,iii) d’appliquer ces protocoles pour générer des dommages ADN in vivo au sein d’un organisme multicellulaireau stade embryonnaire, Caenorhabditis elegans.Ces résultats ouvrent la voie vers des expériences plus fines sur la ligne de micro-irradiation ciblée duCENBG pour étudier les effets de l’interaction des rayonnements ionisants avec le vivant, aux échellescellulaire et multicellulaire, in vitro et in vivoThe main goal of radiobiology is to understand the effects of ionizing radiations on the living.These past decades, ion microbeams have shown to be important tools to study for example the effects oflow dose exposure, or the bystander effect. Since 2003, the CENBG has been equipped with a system toperform targeted micro-irradiation of living samples. Recently, microbeams applications on this subjecthave diversified and the study of DNA repair mechanisms at the cellular and multicellular scales, in vitroand in vivo, has become possible thanks to important evolutions of fluorescence imaging techniques andcellular biology. To take into account these new approaches, the CENBG micro-irradiation beamline hasbeen entirely redesigned and rebuilt to implement new features and to improve the existing ones. My PhDobjectives were i) commissioning the facility, ii) characterizing the system on track etch detectors, and onliving samples, iii) implementing protocols to perform targeted irradiations of living samples with a controlleddelivered dose, at the cellular and multicellular scales, and to visualize the early consequencesonline, iv) modelling these irradiations to explain the biological results using the calculated physical data.The work of these past years has allowed us i) to measure the performances of our system: a beam spotsize of about 2 μm and a targeting accuracy of ± 2 μm, and to develop ion detection systems for an absolutedelivered dose control, ii) to create highly localized radiation-induced DNA damages and to see onlinethe recruitment of DNA repair proteins, iii) to apply these protocols to generate radiation-induced DNAdamages in vivo inside a multicellular organism at the embryonic stage: Caenorhabditis elegans.These results have opened up many perspectives on the study of the interaction between ionizing radiationsand the living, at the cellular and multicellular scales, in vitro and in vivo
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Hérault, Joël. "Etude experimentale du ralentissement d'ions lourds de 20 a 100 mev par nucleon dans la matiere." Toulouse 3, 1988. http://www.theses.fr/1988TOU30075.
Повний текст джерелаАнотація:
Etude experimentale a l'aide d'ions lourds de l'accelerateur ganil sur le spectrometre lise (analyse en energie et en angle) pour determiner le pouvoir d'arret de 11 cibles gazeuses avec une incertitude de plus ou moins 3%. Mise en evidence d'une disparition de la difference entre pouvoirs d'arret des materiaux solides et gazeux lorsque la charge de l'ion tend vers son numero atomique. Analyse des distributions en energies pour de nombreux ions (de l'oxygene au molybdene) et analyse de la distribution angulaire dans des cibles solides et gazeuses. Comparaison des donnees experimentales aux calculs quantiques et classiques
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Mahfoudhi, Mohamed. "Eu3+ ion environment modification by Electron and femtosecond laser irradiation in metaphosphate and polyphosphate glasses." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLX066.
Повний текст джерелаАнотація:
Les verres phosphates dopés terres rares (TR) sont des matériaux attractifs en optique en raison de leur basse température de transition vitreuse et de leur grande capacité à dissoudre les ions de terres rares par rapport aux verres silicates. Dans ce travail, nous sommes intéressés à comprendre les mécanismes conduisant à la modification structurale des verres polyphosphates de zinc et métaphosphates sous irradiation avec pour finalité de contrôler l'environnement des ions terres rares (ions Eu3+ en particulier) par l’irradiation. Nous avons comparé les effets obtenus sous irradiations aux électrons et par laser fs en faisant varier la dose et l’énergie des électrons (700 keV et 2.5 MeV), le taux de répétition du laser ainsi que les compositions de verre qui comportent différents ions alcalins et alcalino-terreux (Na, Li, K et Mg) et teneurs en Zn.Nous avons mis en évidence la diminution de la symétrie du site Eu3+, l’augmentation de la dispersion des sites ainsi qu’une réduction efficace des ions Eu3+ en Eu2+ sous irradiation électronique.La présence de Zn atténue la variation de l’ordre local autour de la terre rare, alors que le réseau vitreux est moins stable sous irradiation. La formation d’ion Eu2+ (sous deux types d’environnement de haute et basse symétries est par ailleurs accrue en présence de Zn et en utilisant des électrons de 700 keV. Le laser femtoseconde à 10 KHz engendre une cristallisation des verres métaphosphates sans réduction des ions Eu3+Rare Earth (RE) doped phosphate glasses are attractive materials in optic due to their low glass transition temperature and their high ability to dissolve rare earth ions compared to silicate glasses. In this work, we are interested in understanding the mechanisms leading to the structural modification of zinc polyphosphate and metaphosphate glasses under irradiation with the aim of controlling the environment of rare earth ions (in particular Eu3+ ions) by irradiation. We compared the effects obtained under electron and femtosecond laser irradiation by varying the dose and electron energy (700 keV and 2.5 MeV), the laser repetition rate as well as the glass compositions that contain different alkaline and alkaline earth ions (Na, Li, K and Mg) and Zn contents.We have demonstrated the decrease of the Eu3+ site symmetry, the increase of the sites dispersion as well as an effective reduction of Eu3+ to Eu2+ under electron irradiation.The presence of Zn attenuates the variation of the local order around the rare earth, while the vitreous network is less stable under irradiation. The formation of Eu2+ ions (under two types of high and low symmetry environments) is further enhanced in the presence of Zn and using 700 keV electrons. The femtosecond laser at 10 KHz gives causes crystallization of metaphosphate glasses without reduction of Eu3+ ions
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Boccanfuso, Marc. "Relation entre le gonflement et la creation de defauts dans les cristaux ioniques irradies par des ions lourds rapides." Phd thesis, Université de Caen, 2001. http://tel.archives-ouvertes.fr/tel-00002023.
Повний текст джерелаАнотація:
Lorsque des ions lourds rapides pénètrent dans la matière, ils se ralentissent principalement en déposant leur énergie sur les électrons. Ceci peut conduire à de fortes densités d'excitations électroniques dans le matériau et ainsi à des modifications structurales. Dans ce travail, le fluorure de calcium (CaF2) a été utilisé pour approfondir l'étude de l'endommagement des cristaux ioniques par irradiation avec ces ions lourds rapides. Quatre techniques ont principalement été employées pour caractériser cet endommagement. Ces techniques d'analyse sont la diffraction de rayons X aux grands angles, la profilométrie de surface, la spectrométrie de rétrodiffusion Rutherford en canalisation et la spectroscopie d'absorption optique UV-visible. Les résultats de ce travail montrent que le CaF2 répond de manière multiple aux excitations électroniques créées par l'irradiation. Pour des pouvoirs d'arrt supérieurs à environ 5 keV/nm, un phénomène de polygonisation semble se produire. Ceci provoque un désordre structural, un gonflement de 0,27 % du matériau et la formation de fractures. Un deuxième mécanisme d'endommagement est occasionné au-dessus d'environ 13 keV/nm et se traduit par une perte de la structure cristalline d'origine. Cependant, des centres absorbants apparaissent quel que soit le pouvoir d'arrèt des ions, ce qui indique que ces défauts ne peuvent tre la cause des deux mécanismes d'endommagement précédents. L'interprétation par un modèle de pointe thermique permet d'associer les deux seuils précédents respectivement aux énergies de fusion et de sublimation du matériau.
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Tenorio, Castilleros Maria Dolorès. "Contribution a l'etude de l'emission x induit par des ions br et kr acceleres et possibilites d'application analytiques." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13075.
Повний текст джерелаАнотація:
En vue d'eventuelles applications analytiques, l'emission de rayons x lors du bombardement de cibles epaisses par des ions br et kr d'energies comprises entre 3 et 85 mev a ete etudiee. Leurs rendements en rayons x par des cibles epaisses ont ete mesures et les sections efficaces d'ionisation des couches k et l en ont ete deduites. Les variations des rapports d'intensite de certaines raies, ainsi que les deplacements en energie ont egalement ete determines. L'ensemble des resultats est examine a la lumiere des modeles theoriques existant actuellement pour rendre compte de l'ionisation des couches internes lors des collisions atomiques. Comme application pratique, des ceramiques azteques ont ete analysees. Les possibilites et les difficultes de la methode analytique sont mises en evidence
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Marinoni, Mathias. "Étude des modifications morphologiques induites par un ion lourd unique sur des structures SiO2-Si : fiabilité des dispositifs MIS." Nice, 2008. http://www.theses.fr/2008NICE4104.
Повний текст джерелаАнотація:
Les travaux présentés dans ce manuscrit se placent du point de vue de la fiabilité des dispositifs MOS embarqués dans les applications spatiales, face à la contrainte radiative exercée par les ions lourds. L’approche novatrice de cette étude est symbolisée par la prise en compte de la réponse du matériau à l’irradiation, afin d’apporter des éléments de réponse utiles à la compréhension des phénomènes physiques qui conduisent à l’apparition d’effets qui peuvent altérer le fonctionnement des dispositifs, avec en particulier la diminution de la durée de vie des composants. Les travaux entrepris ont permis de proposer une origine physique à la formation de défauts latents, induits par les ions lourds. En effet, au travers d’expériences en recuit thermique et en stress électrique, nous avons montré que les modifications structurelles observées dans du dioxyde de silicium après une irradiation par des ions lourds pourraient agir comme une contribution supplémentaire qui conduit au déclenchement prématuré du claquage de l’oxyde de grille dans les dispositifs MOS irradiés par des ions lourds. Les résultats obtenus dans le cadre de cette étude peuvent avoir des répercussions sur les transistors MOS de puissance, en termes d’assurance radiation et de procédures de qualificationHeavy ion effects on the reliability of on-board satellite MOS devices have been investigated in this PhD dissertation. In order to give some elements to understand better the physical mechanisms leading to electrical effects, such as the reduction of the device lifetime, this new approach is based on the material response to heavy ion irradiation. The obtained results led to find out a physical origin to latent defects formation that is known to result in a device lifetime decrease. Using both thermal annealing experiments and electrical stress procedures, structural modifications induced by heavy ions in silicon dioxide have been shown to possibly act as an extra contribution leading to premature gate oxide breakdown of MOS devices. Those results could have implications on MOSFET devices, in terms of radiation assurance and for tests standards
Книги з теми "Irradiation par ion"
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Hoskin, Peter. Testis. Oxford University Press, 2013. http://dx.doi.org/10.1093/med/9780199696567.003.0011.
Повний текст джерелаАнотація:
Chapter 8c discusses the role of radiotherapy in testicular cancer and how it is becoming less prominent. The mainstay of treatment is radical orchidectomy and, where there is a risk of metastatic disease, combination chemotherapy. Radiotherapy may be indicated in the following situations: 1) Stage I testicular seminoma delivering prophylactic para-aortic lymph nodes irradiation, and 2) Palliative treatment in the management of chemotherapy resistant disease.
Частини книг з теми "Irradiation par ion"
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Müller, W., H. Piazena, and Peter Vaupel. "From Sun to Therapeutic wIRA." In Water-filtered Infrared A (wIRA) Irradiation, 17–33. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92880-3_2.
Повний текст джерелаАнотація:
AbstractLife on Earth is significantly influenced by the electromagnetic radiation of the sun. Its energy most probably stimulated physical/chemical processes and has been used by living organisms for further development during evolution. The radiation is generated by nuclear fusion in the core of the sun and emitted into space with a wide range of different wavelengths. The terrestrial spectrum of this radiation shows characteristic absorption bands caused by atmospheric gases, mainly by water vapor, carbon dioxide, and ozone. The water molecules are excited by the absorption of preferentially long-wavelength radiation, which leads to absorption bands in the spectral range of the IR-A and to the total elimination of IR-B and IR-C. The excitation causes vibrations and rotations of the water molecules, increasing their kinetic energy, i.e., heat. This effect is used in medicine for therapeutic heating of tissues. It is technically achieved by water-filtered IR-A (wIRA) radiatior. Its radiation is comparable to the IR-A part of the terrestrial solar spectrum, but its total irradiance in the IR-A is much higher than that of the sun and can be adapted to therapeutic needs.
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Klemm, P., I. Aykara, and U. Lange. "Water-Filtered Infrared A Irradiation in Axial Spondyloarthritis: Heat for Lower Back Pain." In Water-filtered Infrared A (wIRA) Irradiation, 233–43. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92880-3_20.
Повний текст джерелаАнотація:
AbstractThe effect of serial locally applied wIRA (sl-wIRA) in patients with axial spondyloarthritis (axSpA) is described: time of onset and duration of pain reduction, changes in disease activity and functionality, and changes at the molecular level (cytokines).Seventy-one patients with axSpA receiving an inpatient 7-day multimodal rheumatologic complex therapy (MRCT) were randomized into two groups: 35 patients with standardized MRCT (control group = CG) and 36 patients (intervention group = IG) with additive serial sl-wIRA (2 irradiations/day, total of 12 applications) of the back region.In IG, a significant pain reduction compared to daily baseline values was observed on days 1, 2, and 6 and compared to CG. There was a significant improvement of the global health and functional parameters in IG, a significant reduction of disease activity, and a significant drop in TNF-α serum levels, also significantly different to CG. Levels of IL-1, -6, -10 remained unchanged.sl-wIRA, as part of an MRCT in axSpA patients, caused a significant pain decrease on days 2 and 6, allowing an analgesics reduction. Improvement in the general state of health was noted. Decreasing serum levels of TNF-α may explain, at the molecular level, the subjective pain relief.
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Boycheva, Irina, Ralitsa Georgieva, Lubomir Stoilov, and Vasilissa Manova. "Effects of light and UV-C radiation on the transcriptional activity of COP1 and HY5 gene homologues in barley." In Mutation breeding, genetic diversity and crop adaptation to climate change, 478–86. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789249095.0049.
Повний текст джерелаАнотація:
Abstract Photomorphogenic regulators COP1 (Constitutive Photomorphogenic 1) and HY5 (Elongated Hypocotyl 5) play a key role in plant development by guiding the transition from dark to light growth. In Arabidopsis they are also implicated in the transcriptional control of photolyase genes. Here we characterize the transcript abundance of COP1 and HY5 gene homologues in barley in relation to light-grown conditions and UV-damage response. Etiolated and green 6-day-old seedlings were UV-C irradiated and exposed to light or kept in darkness. The abundance of barley COP1 and HY5 transcripts was assessed by real-time RT-PCR. In etiolated leaves we found several-fold lower levels of COP1 transcripts which reached the levels of the green ones after 1 h of light exposure. Barley HY5 transcripts were very low in the dark-grown seedlings and after 1 h of illumination they increased drastically to levels significantly exceeding those measured in the green leaves. Both genes were upregulated by light in the irradiated plants as well, but to a lesser extent compared with their controls, probably due to the presence of non-repaired DNA damage in the etiolated leaves soon after irradiation. The enhanced transcription of barley COP1 under light is unexpected in view of the well-known function of COP1 as a negative regulator of plant photomorphogenesis but conforms to the positive role reported for AtCOP1 in UV-B signalling. HY5 is recognized as a stimulator of light-inducible genes and our data support such a role for the barley HY5 homologue as well. Our study shows that, in barley seedlings, the regulation of COP1 and HY5 gene expression is achieved through light-positive transcriptional modulation, suggesting that both genes contribute to the de-etiolation phase in barley. According to our knowledge, this is the first quantitation of the COP1 and HY5 mRNAs in barley that also regards the UV-damage response of this crop.
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Boaventura, Paula, Dina Pereira, Paula Soares, and José Teixeira-Gomes. "The ringworm campaign in Portugal, 1940–1970." In Ringworm and Irradiation, 181–214. Oxford University Press, 2022. http://dx.doi.org/10.1093/med/9780197568965.003.0007.
Повний текст джерелаАнотація:
This chapter discusses the fight against the tinea capitis (ringworm) epidemic in Portugal, especially the campaign that took place in the northern part of the country. This campaign was centered in Porto, an important coastal city in northwestern Portugal, and was conducted from the former social hygiene dispensary (DCHSP). Mobile teams were employed, equipped with an x-ray device, so that irradiation treatments could be carried out in the most remote areas of the country. The chapter is divided into four sections: diagnosis and disease evolution, epidemiology, treatment, and possible late effects from the treatment. The latter section addresses the long-term health problems observed in more than 1,300 individuals who underwent x-ray epilation as children at the DCHSP.
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Hoskin, Peter. "Testis." In External Beam Therapy, 279–81. Oxford University Press, 2019. http://dx.doi.org/10.1093/med/9780198786757.003.0012.
Повний текст джерелаАнотація:
Chapter 12 discusses the role of radiotherapy in testicular cancer and how it is becoming less prominent. The mainstay of treatment is radical orchidectomy and, where there is a risk of metastatic disease, combination chemotherapy. Radiotherapy may be indicated in the following situations: 1) stage I and IIa testicular seminoma delivering prophylactic para-aortic lymph nodes irradiation, and 2) palliative treatment in the management of chemotherapy resistant disease.
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W. Nims, Raymond, and Mark Plavsic. "Physical Inactivation of SARS-CoV-2 and Other Coronaviruses: A Review." In Disinfection of Viruses [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.103161.
Повний текст джерелаАнотація:
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the virus responsible for the ongoing pandemic of Coronavirus Disease 2019 (COVID-19). Other members of the enveloped RNA virus family Coronaviridae have been responsible for a variety of human diseases and economically important animal diseases. Disinfection of air, environmental surfaces, and solutions is part of infection prevention and control (IPAC) for such viruses and their associated diseases. This article reviews the literature on physical inactivation (disinfection) approaches for SARS-CoV-2 and other coronaviruses. Data for thermal (heat) inactivation, gamma irradiation, and ultraviolet light in the C range (UVC) irradiation have been reviewed. As expected, the susceptibilities of different members of the Coronaviridae to these physical inactivation approaches are similar. This implies that knowledge gained for SARS-CoV-2 should be applicable also to its emerging mutational variants and to other future emerging coronaviruses. The information is applicable to a variety of disinfection applications, including IPAC, inactivation of live virus for vaccine or laboratory analytical use, and waste stream disinfection.
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Maruyama, Yuji, Yasushi Ikarashi, C. Leroy Blank, and W. B. Stavinoha. "Current status of rapid enzyme inactivation through the use of microwave irradiation." In Methods in Neurotransmitter and Neuropeptide Research, Part 1, 273–309. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-444-81369-5.50014-6.
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Hanu, Alina-Mihaela, Eveline Popovici, Pegie Cool, and Etienne F. Vansant. "A facile synthesis of MCM-41 by ultrasound irradiation." In Recent Progress in Mesostructured Materials - Proceedings of the 5th International Mesostructured Materials Symposium (IMMS2006), Shanghai, P.R. China, August 5-7, 2006, 169–72. Elsevier, 2007. http://dx.doi.org/10.1016/s0167-2991(07)80291-6.
Повний текст джерела
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Dutta, Debnarayan, and Yarlagadda Sreenija. "Radiation Induced Liver Toxicity." In Hepatotoxicity [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.105410.
Повний текст джерелаАнотація:
Liver was always considered to be ‘highly sensitive’ to radiation therapy (RT) and was not considered ‘safe’ for radiation therapy treatment. The most significant radiation induced liver toxicity was described by Ingold et al. as “Radiation hepatitis.” Historically, radiation to liver lesions with curative intent or incidental exposure during adjacent organ treatment or total body irradiation implied whole organ irradiation due to lack of high precision technology. Whole organ irradiation led to classic clinical picture termed as “Radiation Induced Liver Disease (RILD).” In conventional fractionation, the whole liver could be treated only to the doses of 30–35Gy safely, which mostly serves as palliation rather than cure. With the advent of technological advancements like IMRT, especially stereotactic radiation therapy (SBRT), the notion of highly precise and accurate treatment has been made practically possible. The toxicity profile for this kind of focused radiation was certainly different from that of whole organ irradiation. There have been attempts made to characterize the effects caused by the high precision radiation. Thus, the QUANTEC liver paper distinguished RILD to ‘classic’ and ‘non-classic’ types. Classic RILD is defined as ‘anicteric hepatomegaly and ascites’, and also can also have elevated alkaline phosphatase (more than twice the upper limit of normal or baseline value). This is the type of clinical picture encountered following irradiation of whole or greater part of the organ. Non-classic RILD is defined by elevated liver transaminases more than five times the upper limit of normal or a decline in liver function (measured by a worsening of Child-Pugh score by 2 or more), in the absence of classic RILD. In patients with baseline values more than five times the upper limit of normal, CTCAE Grade 4 levels are within 3 months after completion of RT. This is the type of RILD that is encountered typically after high-dose radiation to a smaller part of liver. It is commonly associated with infective etiology. Emami et al. reported the liver tolerance doses or TD 5/5 (5% complication rate in 5 years) as 50 Gy for one-third (33%) of the liver, 35 Gy for two-thirds (67%) of the liver, and 30 Gy for the whole liver (100%). Liver function (Child Pugh Score), infective etiology, performance status and co-morbidities influence the radiation induced toxicity. Lyman–Kutcher–Burman (LKB)-NTCP model was used to assess dose-volume risk of RILD. Lausch et al. at London Regional Cancer Program (LRCP), developed a logistic TCP model. Quantitative Analysis of Normal Tissue Effects in the Clinic (QUANTEC) reported recommendations that mean normal liver dose should be <18 Gy for baseline CP-A patients and < 6 Gy for those with CP-B, for a 6-fraction SBRT regimen. The University of Colorado phase 1 clinical trial of SBRT for liver metastases described the importance of the liver volume spared, that is, ‘critical volume model.’ It is estimated that a typical normal liver volume is approximately 2000 mL and specified that a minimum volume of 700 mL or 35% of normal liver should remain uninjured by SBRT i.e. at least 700 mL of normal liver (entire liver minus cumulative GTV) had to receive at total dose less than 15 Gy. In treatment regimen of 48 Gy in 3 fractions, CP-A patients were required to either limit the dose to 33% of the uninvolved liver (D33%) < 10 Gy and maintain the liver volume receiving <7 Gy to <500 cc. In more conservative treatment regimen, such as in 40 Gy in 5 fractions schedule, CP-B7 patients had to meet constraints of D33% < 18 Gy and/or > 500 cc receiving <12 Gy. The concept of body surface area (BSA) and Basal Metabolic Index (BMI) guided estimation of optimal liver volume is required to estimate the liver volume need to be spared during SBRT treatment. Radiation induced liver injury is potentially hazardous complication. There is no definitive treatment and a proportion of patient may land up in gross decompensation. Usually supportive care, diuretics, albumin supplement, and vitamin K replacement may be useful. Better case selection will avert incidence of RILD. Precise imaging, contouring, planning and respecting normal tissue constraints are critical. Radiation delivery with motion management and image guidance will allow delivery of higher dose and spare normal liver and hence will improve response to treatment and reduce RILD.
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Boterberg, Tom, Yen-Ch’ing Chang, Karin Dieckmann, Eve Gallop-Evans, Mark Gaze, Paul Humphries, Anna Kelsey, Øystein Olsen, Derek Roebuck, and Chitra Sethuraman. "Lymphoid and haematological malignancy and related conditions." In Radiotherapy and the Cancers of Children, Teenagers, and Young Adults, edited by Tom Boterberg, Karin Dieckmann, and Mark Gaze, 278–300. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198793076.003.0008.
Повний текст джерелаАнотація:
Chapter 8 discusses lymphoid and haematological malignancy and related conditions in children and young people. Radiotherapy is less frequently used in haematological malignancy and allied disorders than it once was. In Hodgkin lymphoma, better risk stratification, more effective systemic therapy and the use of 18F-fluoro-deoxyglucose positron emission tomography (18F-FDG-PET) imaging to assess response to chemotherapy have facilitated a safe reduction in the indications for radiotherapy. Nonetheless, radiotherapy remains an important component of multimodality therapy in patients with advanced or poorly responding disease. In acute leukaemia, radiotherapy is no longer used as part of first-line treatment schedules. Instead, it is reserved for refractory and relapsed disease. Total body irradiation remains valuable as part of conditioning prior to haemopoietic stem cell transplantation. Cranial and testicular radiotherapy is helpful for selected patients who relapse in these sanctuary sites. Radiotherapy is also indicated infrequently in some unusual and benign haematological conditions.
Тези доповідей конференцій з теми "Irradiation par ion"
1
Ruxandra, Caramitu Alina, Zaharescu Traian, and Mitrea Sorina. "Irradiation effect on PA6 properties of electrical insulation." In 2015 9th International Symposium on Advanced Topics in Electrical Engineering (ATEE). IEEE, 2015. http://dx.doi.org/10.1109/atee.2015.7133852.
Повний текст джерела
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Peithmann, Konrad, Mohammad-Reza Zamani-Meymian, Hilke Hattermann, Matz Haaks, Karl Maier, Birk Andreas, Michael Kösters, and Ingo Breunig. "Permanent modification of material parameters in LiNbO3 crystals by irradiation with low-mass, high-energy ions." In Photorefractive Effects, Photosensitivity, Fiber Gratings, Photonic Materials and More. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/pr.2007.sub2.
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Mimura, Hitoshi, Shunsuke Susa, Yoshiyuki Ito, Yasuo Saito, and Minoru Matsukura. "Adsorption Properties of Sr(II) on Zeolite Type Adsorbents and Their Irradiation Stabilities." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30329.
Повний текст джерелаАнотація:
Radioactive waste treatment is planned in LWTF (Low-level radioactive Waste Treatment Facility, JAEA) for LLW generated from the Tokai-reprocessing facility. The target LLW consists of highly concentrated sodium nitrate (5 M NaNO3) containing low-level 90Sr. In this study, selective adsorption properties of Sr2+ for highly functional A type zeolites (A51-JHP, A51-J (Union Showa) and A-4, X type zeolite (F-9) and Titanic acid-PAN (polyacrylamide) were clarified by batch and column adsorption methods. The irradiation stabilities of these adsorbents were also evaluated. The distribution properties of Sr2+ on different adsorbents were compared in simulated waste solution (5 M NaNO3, 0.1 ppm Sr2+, 85Sr as tracer). The order of distribution coefficients (Kd,Sr) was Titanic acid-PAN > A51-JHP > A51-J > A-4 > F-9. The largest value of Kd,Sr for titanic acid-PAN was estimated to be 218 cm3/g, while the saturated capacity (Qmax) was very small. Titanic acid-PAN had also the largest uptake rate of Sr2+ ions and the uptake attained equilibrium within 8 h. On the other hand, A51-JHP had a relatively large Kd,Sr value above 100 cm3/g and a Qmax value of 0.65 mmol/g. The breakthrough properties of Sr2+ were examined by varying cations present (single and mixed solutions) and flow rate (0.08 and 0.17 cm3/min). The components for the single solution were 400 g/L NaNO3, 100 ppm Sr2+, 85Sr as tracer, and the mixed solution contains 200 ppm Cs+, 100 ppm Ca2+, 50 ppm Mg2+, 50 ppm RuNO3+ in addition to the single solution components. The breakthrough curve for Titanic acid-PAN column using single solution had an S-shaped profile, while the “concentration phenomenon” exceeding C/C0 (breakthrough ratio) = 1 was observed in the case of mixed solution. As for the A51-JHP column, the breakthrough curve for single solution was similar to that for mixed solution and the 5% breakpoint was enhanced by decreasing the flow rate. The A51-JHP was stable under 60Co-irradiation up to 2.54 MGy; Kd,Sr and Qmax values were almost constant. In contrast, Titanic acid-PAN was affected above 0.28 MGy, due to the radiolysis of PAN matrix, and this surface alteration led to the release of active component of titanic acid. The novel A type zeolite (A51-JHP) is thus expected for the selective removal of Sr2+ in LWTF. The optimization of particle size and flow rate should be examined before practical use.
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Lin, Dong, Sergey Suslov, Chang Ye, Yiliang Liao, C. Richard Liu, and Gary J. Cheng. "Nanoparticles Embedding Into Metallic Materials by Laser Direct Irradiation." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7379.
Повний текст джерелаАнотація:
We report a method to half-embed nanoparticles into metallic materials. Transparent and opaque nanoparticle (laser wavelength 1064 nm) were both successfully half-embedded (partial part of nanoparticles embedded into matrix while other parts still stay above the matrix) into metallic materials. Nanoparticles were coated on sample surface by dip coating before laser irradiation. After laser irradiation of different pulses and laser fluencies, nanoparticles were embedded into metal. The mechanism and process of embedding were investigated.
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Alhadri, Muapper, Waleed Zakri, and Siamak Farhad. "Second-Life Analysis of Lithium-Ion Battery in a Residential Solar Photovoltaic Grid-Tied System." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-73403.
Повний текст джерелаАнотація:
Abstract The behavior of retired lithium-ion battery (LIB) from its first-life application such as electric vehicles and electric aircraft for its second-life in a solar photovoltaic (PV) grid-tied system for residential applications is studied through mathematical modeling. The rate of capacity-fade and the useful remaining life of the retired- or used-LIB particularly investigated in this paper. The first part of this paper presents the optimal size of a small-scale battery energy storage system (BESS) to store a part of the solar energy for postponing consumption in the near future for a typical home in Akron, Ohio. The LIBs in this study has lithium nickel manganese cobalt oxide (NMC) chemistry. The sizing is determined based on a set of PV panels, power rate of the BESS, and hourly data of temperatures, irradiation and home demand load. Using PVWatts® Calculator from National Renewable Energy Laboratory (NREL), the hourly PV performance data of the PV generation system is obtained. In this study, the home is connected to the grid, but the net energy usage from the grid in one year is zero. The duty-cycle of the PV generation is obtained in order to design a LIB energy storage system using calculations of the PV system hourly energy production. The difference between the residential home demand and PV generation is used to evaluate the excess energy that charges the battery and is sold to the electric grid. In the second part, the retired- or the used-battery degradation rate and its remaining useful second-life in the BESS are estimated using an empirical battery model. This model includes the capacity-fade of the LIB for both first- and second-life applications under different operating and environmental conditions. It is shown that a used-LIB from first-life applications is still suitable to be used for this system. The results show that the investigated used-LIB is capable of being in-service for another 10 years in the PV system for residential application. The results of this paper can potentially reduce the battery cost for electric vehicles and electric aircraft because the retired battery from these applications have still value to serve for another applications such as PV system for residential homes. Since this study is based on mathematical modeling, several assumptions have been made in the model. Although the results of mathematical modeling is very promising, these results should be proved experimentally. The experimental studies is out of the scope of this paper.
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Autsavapromporn, Narongchai, Ianik Plante, Cuihua Liu, Teruaki Konishi, Noriko Usami, Tomoo Funayama, Yukio Uchihori, et al. "Abstract 1815: Bystander effect and genomic instability in human cells and their progeny after irradiation with X rays, protons or carbon ions: role of gap junction communication." In Proceedings: AACR 106th Annual Meeting 2015; April 18-22, 2015; Philadelphia, PA. American Association for Cancer Research, 2015. http://dx.doi.org/10.1158/1538-7445.am2015-1815.
Повний текст джерелаЗвіти організацій з теми "Irradiation par ion"
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Garner, F. A., and M. B. Toloczko. Irradiation creep and swelling of various austenitic alloys irradiated in PFR and FFTF. Office of Scientific and Technical Information (OSTI), October 1996. http://dx.doi.org/10.2172/414882.
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Gray, P. L. Thorium-1.4 wt per cent 235Uranium Metal Fuel Tubes - Fabrication and Irradiation in HWCTR. Office of Scientific and Technical Information (OSTI), March 2003. http://dx.doi.org/10.2172/810365.
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Toloczko, M. B., F. A. Garner, and C. R. Eiholzer. Irradiation creep of various ferritic alloys irradiated {approximately}400 C in the PFR and FFTF reactors. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/335392.
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Bates, J. K., D. F. Fischer, and T. J. Gerding. Reaction of glass during gamma irradiation in a saturated tuff environment. Part 1. SRL 165 glass. Office of Scientific and Technical Information (OSTI), February 1986. http://dx.doi.org/10.2172/59835.
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Toloczko, M. B., F. A. Garner, and B. Munro. The compositional dependence of irradiation creep of austenitic alloys irradiated in PFR at 420{degrees}C. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/543297.
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Toloczko, M. B., F. A. Garner, and C. R. Eiholzer. Irradiation creep of various ferritic alloys irradiated at {approximately}400{degrees}C in the PFR and FFTF reactors. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/543290.
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Hendel, Susanne, Carmel Margaret Lindkvist, Gabriele Lobaccaro, Romain Nouvel, Alexander Saurbier, Nava Shahin, Tanja Siems, Tjado Voss, and Maria Wall. State-of-the-Art of Education on Solar Energy in Urban Planning - Part 2: Solar Irradiation Potential Tools in Education. Edited by Tanja Siems, Katharina Simon, and Karsten Voss. IEA SHC Task 51, February 2018. http://dx.doi.org/10.18777/ieashc-task51-2018-0002.
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Abrajano, T. A. Jr, J. K. Bates, T. J. Gerding, and W. L. Ebert. The reaction of glass during gamma irradiation in a saturated tuff environment: Part 3, long-term experiments at 1 x 10{sup 4}rad/hour. Office of Scientific and Technical Information (OSTI), February 1988. http://dx.doi.org/10.2172/60456.
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Ebert, W., J. Bates, and T. Gerding. The reaction of glass during gamma irradiation in a saturated tuff environment; Part 4, SRL 165, ATM-1c, and ATM-8 glasses at 1E3 R/h and O R/h. Office of Scientific and Technical Information (OSTI), May 1990. http://dx.doi.org/10.2172/137753.
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