Relevant bibliographies by topics / Radioluminescenza

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  2. Dissertations / Theses
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Academic literature on the topic 'Radioluminescenza'

Author: Grafiati
Published: 9 March 2023
Last updated: 10 March 2023

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Journal articles on the topic "Radioluminescenza"

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Cooper, Daniel R., John A. Capobianco, and Jan Seuntjens. "Radioluminescence studies of colloidal oleate-capped β-Na(Gd,Lu)F4:Ln3+ nanoparticles (Ln = Ce, Eu, Tb)." Nanoscale 10, no. 16 (2018): 7821–32. http://dx.doi.org/10.1039/c8nr01262h.

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Shvindin, Mikhail A., and Vadim V. Bakhmetyev. "SYNTHESIS OF ZINC SULFIDE RADIOLUMINESCENT PHOSPHORS WITH USE OF ELECTRONIC BEAM MODIFICATION AND INVESTIGATION OF THEIR PROPERTIES." Bulletin of the Saint Petersburg State Institute of Technology (Technical University) 58 (2021): 46–50. http://dx.doi.org/10.36807/1998-9849-2021-58-84-46-50.

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Synthesized recombination-type zinc sulfide phosphors used in solid-state radioluminescent light sources (SSRLS) are the object of the research. In the course of the study, experimental data were obtained for the first time on the effect of the amount of the incorporated activator on the brightness-spectral characteristics of radioluminescence upon excitation by β-radiation of tritium. Data were obtained on the changes in the radioluminescence parameters under various synthesis conditions, phase composition and electron-beam modification of the crystal structure of the initial phosphors. The results of the work make it possible to find the best light compositions for the use in solid-state radioluminescent light sources
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Bai, Tingting, Fei Kang, Shouping Zhu, Xueli Chen, Yihan Wang, and Xu Cao. "Painted radioluminescence imaging with radioluminescent nanophosphors." Applied Physics Letters 121, no. 23 (December 5, 2022): 233701. http://dx.doi.org/10.1063/5.0130428.

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Optical strategies like Cerenkov luminescence imaging (CLI) or radioluminescence imaging (RLI) to image clinically available positron emission tomography and single photon emission computed tomography probes still suffer from low sensitivity or resolution. This study investigated a painted radioluminescence imaging (PRLI) approach that employed a painted scintillator to improve signal and resolution for imaging clinical used 18F-fluorinated deoxyribose (18F-FDG). Results of phantom and in vivo experiments revealed that PRLI could achieve ∼100 times higher signal intensity than CLI and higher resolution compared to Flexible radioluminescence imaging (FRLI), a flexible scintillation-based RLI. PRLI increased signal-to-background ratio in the pseudotumor model by 81.8% (compared to CLI) and 73.9% (compared to FRLI) as well as in the tumor model by 60.0% (compared to CLI) and 33.3% (compared to FRLI). As a conclusion, PRLI is a more effective optical approach for detecting tumors using 18F-FDG.
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Zelenina, Elena V., Vadim V. Bakhmetyev, Maxim М. Sychov, and Mikhail A. Shvindin. "Synthesis and Electron-Beam Modification of Zinc-Sulphide Phosphors for Solid-State Radioluminescent Light Sources (SRLS)." Materials Science Forum 1040 (July 27, 2021): 35–40. http://dx.doi.org/10.4028/www.scientific.net/msf.1040.35.

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Radioluminescence technologies are at the front line of the optic and electronic studies. Effective, self-contained and safe radioluminescent light sources can find their application in space industry, in medicine and in military technologies. The question of the performance improvement of the solid-state radioluminescent light sources (SRLS) without raising the included activity of working radionuclide can be solved by upgrading the phosphor crystalline structure. The electron-beam treatment for zinc-sulphide phosphors initial batch has been studied in a wide range of concentrations of the activating agent (Cu) for improving the radioluminescent performances of the phosphors, for creating the structural defects that form centers of luminescence. The changes of the phase composition were investigated under different synthesis conditions. It is revealed that electron-beam treatment of the initial batch leads to the growth of the wurtzite phase content in zinc-sulphide phosphors synthesized below the phase transition temperature. The changes of the phase content promote the spectral redistribution under the tritium beta-excitation. It is obviously the reflection of the fact of «green» luminescence centers rearrangement between the volume of the crystal and its surface. The correlations between structural configuration and performances of ionizing luminescence were found. Electron beam treatment gave the 20% increase of brightness of the radioluminescence. The achieved enhancement of luminescence performances allows the development of advanced tight-packed SRLS with minimal radioactivity and high energy-light conversion.
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Bakhmetyev, V. V., E. V. Zelenina, and M. A. Shvindin. "Synthesis of ZnS:Cu,Br radioluminescent phosphors using the electron-beam treatment and studying their characteristics." Journal of Physics: Conference Series 2056, no. 1 (October 1, 2021): 012047. http://dx.doi.org/10.1088/1742-6596/2056/1/012047.

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Abstract ZnS:Cu radioluminescent phosphors find their applications in medicine nondestructive testing, safety control and can be used as a part of the solid-state radioluminescent light sources (SRLS). This devices are very promising technology due to their independence longevity and safety compared to the gas-filled RLS. Because of the fact that tritium (the most popular radioisotope for RLS) has a very short range in substances, the improving the operating performances of radiophosphors is a crucial task for SRLS. In our study we used the electron-beam treatment to increase the brightness of radioluminescence of ZnS:Cu phosphors. It was found that bombardment of the phosphors initial charge with electrons of 900 kEv energy improves the brightness of radioluminescence by 15 – 20%. Double modifying of the initial charge and ready phosphor cause the 80% increase of brightness. The effect of electron-beam treatment on the phase content and the surface properties was studied at varying the content of activator (Cu) in the range of 0 – 0.6 % mass. As a result the model describing structure of the acid-base sites on the ZnS:Cu phosphor surface was suggested.
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Purbandari, Dessy, Ferdiansjah Ferdiansjah, and Tjipto Sujitno. "Optimization of the Alpha Energy Deposited in Radioluminescence Thin Film for Alphaphotovoltaic Application." Proceeding International Conference on Science and Engineering 2 (March 1, 2019): 41–44. http://dx.doi.org/10.14421/icse.v2.52.

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Activated zinc sulfide (ZnS) is a semiconductor material which able to emit photon in the form of visible light when expose to external energy. The capability of activated ZnS, mainly doped with silver (Ag) and copper (Cu), to convert radiation become light to make it potentially applicable as the radioluminescent thin film for alphaphotovoltaic-type nuclear battery. One of the important specifications of the radioluminescence layer that influences the fluorescence efficiency is the thickness. This work presents a study on the thickness optimization for ZnS:Ag:Cu as the radioluminescent film for alpha particles using Monte Carlo model. Simulation to study alpha particles’ energy deposited by using Stopping and Range of Ions in Matter/TRansport of Ions in Matter (SRIM/TRIM) code. The model examined the transport of 5.485 MeV alpha particles emitted by to determine the best thickness based on energy deposition depth. Based on TRIM module simulation, the optimal thickness for radioluminescence film is approximately 19-22 µm. Most energy from 5.485 MeV alpha particles is deposited in 18.92 µm depth activated zinc sulfide. The results from SRIM/TRIM model then compare with analytical calculation using Bragg-Kleman rule. The alpha particles stop at 22 µm from the SRIM/TRIM simulation while using Bragg-Kleman formula the alpha particles stop at 23.51 µm.
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Yamaji, Akihiro, Shunsuke Kurosawa, Akira Suzuki, Jan Pejchal, Kei Kamada, Yuui Yokota, and Akira Yoshikawa. "Optical and Scintillation Properties of Cr Doped Y3Ga5O12 Crystal for Infra-Red Scintillators." Key Engineering Materials 616 (June 2014): 92–95. http://dx.doi.org/10.4028/www.scientific.net/kem.616.92.

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We evaluated optical and scintillation properties of a Cr 0.5%:Y3Ga5O12 (YGG) and Cr 0.5%:Y3Al5O12 (YAG) crystals grown by the micro-pulling down method for infrared emission scintillators. In the photoluminescence and X-ray induced radioluminescence measurements, the emissions peaks of Cr:YGG were located in the longer wavelength than those of Cr:YAG. Radioluminescene spectrum of Cr:YGG had a broad peak at 716 nm related to Cr3+2E→4A2 and 4T→4A2 transitions.
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Chiodini, N., A. Vedda, and I. Veronese. "Rare Earth Doped Silica Optical Fibre Sensors for Dosimetry in Medical and Technical Applications." Advances in Optics 2014 (October 14, 2014): 1–9. http://dx.doi.org/10.1155/2014/974584.

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Radioluminescence optical fibre sensors are gaining importance since these devices are promising in several applications like high energy physics, particle tracking, real-time monitoring of radiation beams, and radioactive waste. Silica optical fibres play an important role thanks to their high radiation hardness. Moreover, rare earths may be incorporated to optimise the scintillation properties (emission spectrum, decay time) according to the particular application. This makes doped silica optical fibres a very versatile tool for the detection of ionizing radiation in many contexts. Among the fields of application of optical fibre sensors, radiation therapy represents a driving force for the research and development of new devices. In this review the recent progresses in the development of rare earth doped silica fibres for dosimetry in the medical field are described. After a general description of advantages and challenges for the use of optical fibre based dosimeter during radiation therapy treatment and diagnostic irradiations, the features of the incorporation of rare earths in the silica matrix in order to prepare radioluminescent optical fibre sensors are presented and discussed. In the last part of this paper, recent results obtained by using cerium, europium, and ytterbium doped silica optical fibres in radiation therapy applications are reviewed.
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Kerst, Thomas, Rikard Malmbeck, Nidhu Banik, and Juha Toivonen. "Alpha Radiation-Induced Luminescence by Am-241 in Aqueous Nitric Acid Solution." Sensors 19, no. 7 (April 2, 2019): 1602. http://dx.doi.org/10.3390/s19071602.

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When exposed to air, alpha particles cause the production of light by exciting the molecules surrounding them. This light, the radioluminescence, is indicative of the presence of alpha radiation, thus allowing for the optical sensing of alpha radiation from distances larger than the few centimeters an alpha particle can travel in air. While the mechanics of radioluminescence in air and other gas compositions is relatively well understood, the same cannot be said about the radioluminescence properties of liquids. Better understanding of the radioluminescence properties of liquids is essential to design methods for the detection of radioactively contaminated liquids by optical means. In this article, we provide radioluminescence images of Am-241 dissolved in aqueous nitric acid ( HNO 3 ) solution and present the recorded radioluminescence spectrum with a maximum between 350 nm and 400 nm , and a steep decrease at the short wavelength side of the maximum. The shape of the spectrum resembles a luminescence process rather than Cerenkov light, bremsstrahlung, or other mechanisms with broadband emission. We show that the amount of light produced is about 150 times smaller compared to that of the same amount of Am-241 in air. The light production in the liquid is evenly distributed throughout the sample volume with a slight increase on the surface of the liquid. The radioluminescence intensity is shown to scale linearly with the Am-241 concentration and not be affected by the HNO 3 concentration.
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Mysiura, I. "Photo- and radioluminescence of poleskiy amber." Functional Materials 23, no. 4 (December 20, 2016): 582–86. http://dx.doi.org/10.15407/fm23.04.404.

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Dissertations / Theses on the topic "Radioluminescenza"

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MONTI, ANDREA MAURIZIO. "Point defects in quartz: Role in trapping and luminescence." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2021. http://hdl.handle.net/10281/311082.

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In questo lavoro di tesi sono state studiate le proprietà di intrappolamento e luminescenza dei difetti di punto nel quarzo. Tali proprietà sono usate in dosimetria retrospettiva al fine di valutare età archeologiche di reperti ceramici, età geologiche di sedimenti e radiazioni assorbite in casi di incidenti nucleari. Lo studio vuole fare chiarezza sui meccanismi specifici che governano tali proprietà nel quarzo. Nonostante il materiale sia arcinoto e già esistano applicazioni di questo materiale nei campi citati, queste ultime si basano su metodi empirici ed una teoria che possa spiegare e prevedere nel dettaglio le emissioni del quarzo è ancora incompleta. Per fare ciò, sono state sfruttate sia tecniche di luminescenza indotte, direttamente o indirettamente, da radiazioni ionizzanti quali termoluminescenza (TL) e radioluminescenza (RL), sia una tecnica che studia i difetti paramagnetici, o in generale elettroni non accoppiati, ovvero la risonanza paramagnetica elettronica (EPR). TL e RL infatti non sono in grado da sole di poter identificare quali difetti siano responsabili delle emissioni del quarzo, ma è possibile cercare correlazioni usando tecniche che invece possono osservare direttamente tali difetti, come appunto la tecnica EPR. Correlando dati di TL ed EPR è stato possibile identificare impurezze di germanio con elettroni intrappolati, in particolare le trappole per elettroni [GeO4]- e [GeO4/Li+]0, come responsabili di emissioni di TL, i cosiddetti picchi a 110 °C e 375 °C. Nel corso dello studio è stato inoltre possibile individuare un'anomalia nella stabilità termica di uno di questi centri germanio, responsabile per il picco a 110 °C, confermando comunque la correlazione tra i due segnali ma sollevando nuove possibili criticità nelle applicazioni a fini di datazione e dosimetria. Tramite gli studi EPR è stato inoltre possibile individuare nuovi centri paramagnetici mai riportati in letteratura e ne è stata caratterizzata la stabilità termica. Uno di essi è stato assegnato a un centro compensato con idrogeno interstiziale, mentre gli altri ancora necessitano una precisa assegnazione. È stata inoltre studiata la stabilità termica di centri legati a impurezze di titanio e alluminio al fine di cercare possibili correlazioni con proprietà di luminescenza. Delle possibilità sono state proposte, ma sono necessari ulteriori studi riguardo questo specifico punto. Tramite RL e TL è stato mostrato inoltre come le lunghezze d'onda di emissione del quarzo siano molto dipendenti dal tipo di campione studiato e dalla sua storia termica. In particolare, tramite TL risolta in lunghezza d'onda è stato possibile mostrare come le proprietà dei campioni studiati non siano in accordo con alcuni modelli teorici pubblicati in letteratura. Lo studio ha consentito di proporre un'alternativa, seppur finora come modello qualitativo. Tale proposta sostiene che possano esistere correlazioni spaziali tra diversi difetti di punto nel quarzo, consentendo ricombinazioni specifiche senza l'ausilio delle bande di conduzione e valenza del materiale. Benché lo studio sia ben lontano dall'aver trovato una descrizione completa nei comportamenti del quarzo, nuovi importanti tasselli sono stati aggiunti ai decenni di studi pubblicati, avvicinando la comunità scientifica al traguardo finale della comprensione dei processi di luminescenza di questo materiale.
In this thesis work, the trapping and luminescence properties of point defects in quartz have been studied. Such properties are used in retrospective dosimetry in order to evaluate the age of archaeological artefacts, the age of geological sediments and the absorbed radiation in the event of nuclear accidents. The study aims at clarifying the specific mechanisms that rule such properties in quartz. Despite being quartz a well-known material and many applications in the aforementioned fields already existing, these are based on empirical methods and a theory that can explain and predict the emissions in quartz in a detailed way is still incomplete. To do so, two luminescence techniques are used, both induced, directly or indirectly, by ionizing radiation such as thermoluminescence (TL) and radioluminescence (RL), and a technique to study paramagnetic defects, or in general unpaired electrons, that is electron paramagnetic resonance (EPR). In fact, TL and RL alone are not enough to directly identify the defects that are responsible for such emissions, but it is possible to try to correlate their data with other techniques that can directly observe such defects, such as EPR. By correlating TL and EPR data, germanium related centres with trapped electrons, specifically [GeO4]- and [GeO4/Li+]0, have been identified as responsible for the TL emissions known as the peaks at 110 °C and 375 °C. At the same time, it was also possible to identify an anomaly in the thermal stability of one of these germanium centres, responsible for the 110 °C peak, confirming the correlation of the two signals, TL and EPR, but also raising new potential critical issues in the applications for dating and dosimetry. Through EPR studies, new unreported paramagnetic centres have been identified and their thermal stability has been characterized. One of them has been assigned to a centre compensated by interstitial hydrogen, while the others are still lacking a precise labelling. The thermal stability of titanium and aluminium related centres has also been studied, in search of possible correlations with luminescence properties. Some proposals have been advanced, but further studies are needed for this last specific point. Through RL and TL, it has been shown how the emission wavelengths in quartz are very sample dependent and how they are influenced by the thermal history of the studied sample. Specifically, through wavelength resolved TL it was possible to show how the properties of the studied samples do not agree with some published theoretical models. The study was able to propose an alternative, although so far just at a qualitative level. Such proposal claims that there may be spatial correlations between point defects in quartz, allowing specific direct recombination with no passage in the conduction and valence bands of the material. Despite this study is far from having found a complete description of quartz behaviour, new important steps have been added to the huge specific literature, contributing to a deeper comprehension of the luminescence properties of this material.
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Peyrot, Donald. "Fluorescence induite par radioluminescence et applications." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23730/23730.pdf.

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França, Leonardo Vinícius da Silva. "Development of a Thermoluminescence - Radioluminescence Spectrometer." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-29052018-162229/.

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In this work, initially the radioluminescence (RL) and thermoluminescence (TL) techniques are presented. The radioluminescence is the prompt luminescence emitted by a material under ionizing radiation exposure. The thermoluminescence is the luminescence emitted by a material previously exposed to ionizing radiation when excited by heat. Enegy bands concepts, defects in crystals and the different processes of ionization that take place in matter when exposed to ionizing radiation are briefly discussed in order to present the mechanisms involved in RL and TL processes. The usage of the techniques in characterization of materials and dosimetry is reported, legitimating the importance of the instrument developed. Mechanical and structural parts as well as a description of each component of the instrument are fairly described. The implemented algorithm for controlling the instrument and acquiring data is also discussed. The development of the instrument enabled us to generate temperature ramps with a quite good performance, reaching temperatures up to 500 °C with deviations up to 2 °C, having used heating rates between 0.5 °C/s and 5 °C/s. Calibrations of optical spectrometer used in light collection and irradiation system were carried out. Lastly, TL and RL spectra tests were performed. The RL tests were carried out using several materials which emission spectra are well known by literature, namely, carbon-doped aluminium oxide Al2O3:C, terbium-doped gadolinium oxysulphide Gd2O2S:Tb, europium-doped yttrium oxide Y2O3:Eu and dysprosium-doped calcium borate CaB6O10:Dy. For the TL spectra test, the aluminium oxide doped with carbon Al2O3:C was used. The results of RL and TL spectra tests showed a good agreement with the literature, pointing out that the instrument developed in this work is comparable to others instruments in operation from others research groups, making our results reliable.
Nesse trabalho, inicialmente as técnicas de radioluminescência (RL) e termolumi- nescência (TL) são apresentadas. A radioluminescência é a luminescência imediata emitida por um material quando exposto à radiaçao ionizante. A termoluminescência é a luminescência emitida por um material previamente exposto à radiação quando este é aquecido. Conceitos de bandas de energia, defeitos em cristais e os diferentes processos de ionização que ocorrem na matéria quando exposta à radiação ionizante são brevemente discutidos a fim de apresentar os mecanismos envolvidos na RL e TL. A utilização das técnicas na caracterização de materiais e na dosimetria é reportada, justificando a importância do instrumento desenvolvido. As partes mecânicas/estruturais e uma descrição de cada componente do instrumento são descritos. O algoritmo implementado para controle do instrumento e aquisição de dados é também descrito. O desenvolvimento do instrumento possibilitou a geração de rampas de temperatura com uma boa performance, atingindo até 500 °C com variações de até 2 °C ao utilizar taxas de aquecimento entre 0.5 °C/s e 5 °C/s. Calibrações do espectrômetro óptico utilizado na aquisição da luminescência e do sistema de irradiação foram executadas. Por fim, testes de aquisição de espectros de RL e TL foram realizados. Os testes de RL foram realizados utilizando vários materiais cujos espectros de emissão são bem conhecidos pela literatura, a saber, óxido de alumínio dopado com carbono Al2O3:C , oxisulfeto de gadolínio dopado com térbio Gd2O2S:Tb , óxido de ítrio dopado com európio Y2O3:Eu e borato de cálcio dopado com disprósio CaB6O10:Dy. Para o teste dos espectros de TL, o Al2O3:C foi utilizado. Os resultados dos espectros de RL e TL mostraram concordância com a literatura, indicando que o instrumento desenvolvido é comparável a outros instrumentos em operação de outros grupos, tornando os nossos resultados confiáveis.
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Peyrot, Donald A. "Fluorescence induite par radioluminescence et applications." Doctoral thesis, Université Laval, 2006. http://hdl.handle.net/20.500.11794/18321.

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Lindström, Jan. "Radioluminescence : A simple model for fluorescent layers." Licentiate thesis, Linköpings universitet, Medicinsk radiofysik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-70539.

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The aim of this thesis is to present a simple model for the radiation to light conversion processes in fluorescent layers as an aid in future developments and applications. Optimisation between sensitivity and spatial resolution for fluorescent layers in digital radiology is a delicate task where the extrinsic efficiency for various phosphors needs to be established for varying parameters. The extrinsic efficiency of a fluorescent layer can be expressed as the ratio of the light energy per unit area at the screen surface to the incident xray energy fluence. Particle size is a critical factor in determining the value of the extrinsic efficiency, but in most models it is not treated as an independent variable. Based on the definition of a light extinction factor (ξ), a model is proposed such that, knowing the intrinsic efficiency η, the particle size and the thickness of a certain make of screen, the extrinsic efficiency can be calculated for an extended range of particle sizes and / or screen thicknesses. The light extinction factor ξ is an optical parameter determined from experimental data on extrinsic efficiency. The proposed model is compared to established methods. Further experiments have confirmed the validity of the model. Monte-Carlo simulations have been utilised to refine the calculations of energy imparted to the phosphor by taking into account the escape of scattered and K-radiation generated in the screen and interface effects at the surfaces. The luminance was measured for a set of in-house manufactured screens of varying thicknesses and particle sizes. Utilising the proposed model, the corresponding calculated values deviated ± 14 %.within the studied range.
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Bulin, Anne-Laure. "Processus de relaxation d’´énergie dans les nanoscintillateurs." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10195/document.

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Ce travail porte sur l'étude de nanoparticules scintillatrices qui sont capables, par définition, de convertir un rayonnement ionisant en lumière visible ou proche UV. Si le processus de scintillation est actuellement bien connu dans le cas des matériaux macroscopiques, les perturbations susceptibles d'apparaître pour des nanomatériaux le sont moins. En effet, des modifications peuvent être induites par le confinement spatial et les spécificités de structure propres aux nanomatériaux. L'étude de ces perturbations constitue l'objet de cette thèse. Le manuscrit se divise en trois parties. La première vise à quantifier la fraction d'énergie qui se dépose dans une assemblée de nanoparticules après interaction avec un photon haute énergie (X ) ou en réalisant des simulations Monte Carlo basées sur le code de calcul Geant4. La deuxième partie présente un travail expérimental exploratoire qui consiste à comparer des mesures de spectroscopie résolue en temps pour des nanoparticules et un monocristal afin d'extraire des informations sur les étapes de thermalisation et de recombinaison radiative spécifiques aux nanoparticules. La dernière partie de ce manuscrit présente l'étude d'une application novatrice des nanoscintillateurs comme agents thérapeutiques. Ils sont alors utilisés pour activer sous excitation X l'effet photodynamique, base d'une thérapie anti-cancéreuse actuellement limitée au traitement de lésions superficielles
This work deals with scintillating nanoparticles, material able to convert ionizing radiations into visible or Ultra-Violet light. The scintillation process is currently well-known for bulk materials. However, for nanomaterials, several steps of the scintillation process are likely to be slightly modified mainly because of the spatial confinement of charges and the structure specificities in nanomaterials. The study of such perturbations is the aim of this thesis. The manuscript is divided into three parts. The first one aims to quantify the amount of deposited energy within a set of nanoparticles after the interaction with a high energy photon (X or –rays). We thus developed Monte Carlo simulations with the Geant4 toolkit to quantify this energy. The second part presents an exploratory experimental study that consists in comparing time resolved spectroscopy measurements for nanoparticles and a single crystal. The aim is to extract a few tendencies on the thermalization and on the radiative recombination processes specific to nanoscintillators. The last part of this thesis presents an application of nanoscintillators as therapeutic agents. In that case, they are used to activate the photodynamic effect under X-ray irradiation. This last effect is the basis of the photodynamic therapy, an anticancer treatment currently limited to superficial tumors
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Mathis, Stephan Roy II. "Syntheses and Investigations of Photo and Radioluminescent Stilbene- and Anthracene- Based Lanthanide Metal-Organic Frameworks." DigitalCommons@Robert W. Woodruff Library, Atlanta University Center, 2016. http://digitalcommons.auctr.edu/cauetds/25.

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This research explores the synthesis of anthracene and stilbene-based metal-organic framework (MOF) structures as potential scintillating (radioluminescent) materials for use in the detection of gamma radiation. The organic molecules 9,10-anthracenedicarboxylic acid (ADCH2) and trans-4,4’-stilbenedicarboxylic acid (SDCH2), were each used as a linker, in combination with a range of lanthanide metal ions, to synthesize novel three dimensional MOF structures under hydrothermal conditions. With ADCH2, the early period lanthanides yield isostructures with the metal ion in higher coordination (nine) than for those with late period metals (seven). The ADC-MOFs show linker-based photoluminescence properties with well defined vibronic peaks in their emission profile and their emission (λmax~435 nm) blue shifting from that of the ADCH2 powder (~500 nm) and closer to the organic molecule in monomer arrangement (λmax ~ 420 nm). The structures also show photoluminescence lifetimes between 1 and 2 ns, which is similar to the reported value for monomeric anthracene units. The blue-shift and reduction in lifetime, compared to ADCH2, are indicative of minimal π-π interactions amongst the aromatic moieties, thereby limiting the non-radiative relaxation pathways. On exposure to ionizing radiation (protons and g- rays), the ADC-MOFs demonstrated scintillation properties, with a radioluminescence lifetime of ~ 6 ns which is similar to that of the ADCH2 powder. A combination of SDCH2 and lanthanide metal ions produced two isostructured MOFs containing Tm3+ and Er3+, under the hydrothermal synthesis conditions explored. The 3-D structure contained ultra large diamond-shaped pores with dimensions of 16 Å x 30 Å. A blue-shift of fluorescence spectra was observed for the SDC-MOF structures (λmax ~ 425 nm) compared to that of bulk SDCH2 powder (λmax ~475 nm), and closely resembling that of monomeric isolated SDC units (λmax~475 nm). Their photoluminescence lifetime is ~0.76 ns, about half of that observed for SDCH2 powder. The blue shift and reduction in lifetime (compared to SDCH2) is attributed to minimal π-π interactions between SDC units in the MOF structure, thus minimizing associated non-radiative relaxation pathways. The isolation of anthracene and stilbene in MOF structures therefore has the potential to improve their performance as scintillators.
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Miller, T. "An investigation into the growth and characterisation of thin film radioluminescent phosphors for neutron diffraction analysis." Thesis, Nottingham Trent University, 2010. http://irep.ntu.ac.uk/id/eprint/276/.

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This investigation studied the growth and characterisation of thin film phosphors to examine the feasibility of enhancing a solid-state neutron scintillation detector system for increased detection resolution and detection rate. Undertaken in collaboration with the neutron facility ISIS at the Rutherford Appleton Laboratory, it was to examine whether an improved radioluminescent detector could be designed, based on the application of thin film phosphors. Optimisation for the detector was in the areas of increased luminescent emission from each neutron captured, increasing the rate of capture for each measurement and improved spatial resolution. The current ZnS:Ag,Cl phosphor used at ISIS was characterised in terms of its luminescent emission properties and comparisons were made to thin films of potential phosphor materials and the source material used to create the thin films. The phosphors were characterised via photo and radio-luminescent excitation to examine the spectral emission and the luminescent decay properties. Thin films were grown onto a silicon substrate from a ZnS:Ag,Cl phosphor source using RF magnetron sputtering and were characterised in terms of morphology, crystallinity and luminescent properties. Thin films grown using this technique were found to not produce visible emission when excited with UV excitation nor alpha excitation. Following further literature research and using the analysis technique of Rutherford Backscattering it was concluded that the chlorine charge compensation dopant was lost during the growth process resulting in incomplete incorporation of the luminescent silver dopant into the lattice. A range of chlorine doping methods were examined in order to promote charge compensation within the thin films, with the most controlled method using ion implantation, carried out at the Ion Beam Facility at Surrey University. Three samples of ZnS were grown to 800nm, followed by implantation of 0.01at% of silver and either 0.01at%, 0.05at% or 0.20at% of chlorine. Following implantation the thin films were thermally annealed to activate the samples and characterised by their luminescent emission via photo- and radioluminescent excitation. The result of the study was that although a luminescent emission was created using laser excitation, the emission using a 241Am source was of such low intensity they were uncharacterisable using the detection setup. The emission spectrum created by ZnS:Ag,Cl using the PL setup was not the standard broadband emission peak centred around 450nm, but was distorted so that it preferentially enhanced the emission around 485nm, hence create a shoulder peak. This is not significant to the optimisation of the detector, but important to know for characterisation purposes. The emission and decay characteristics of the wafer used for neutron detection by ISIS and the ZnS:Ag,Cl powder purchased from Phosphor Technology are the same. Combining this with extensive experience within the research group of growing ZnS and ZnS:Mn thin films made this powder a suitable as a potential target material for thin film growth. Independent of the calibration problem, the PL emission spectrum from thin films grown using RF magnetron sputtering should have been the same as the PL emission spectrum of the target material used in this technique. However, once a thin film had been grown there was no resultant emission observed. Testing the thin films using Rutherford Back Scattering found that although there were relative proportions of zinc, sulphur and silver there was no chlorine detected. Alternative method of forming a thin film of ZnS:Ag,Cl were investigated, with the most significant method using ion implantation. This technique can accurately implant the small concentrations of dopant required into a thin film with good distribution, hence requiring minimal thermal processing for the dopants to be incorporated into the lattice to activate it. The result was a thin film that when annealed in a furnace in air it rapidly oxidised, where as when annealed under vacuum this did not occur. After a period of eight hours annealing at 600°C a PL emission was observed from the implanted thin films. When the emission spectrum was analysed there was a series of emission peaks. There was potential that one of these peaks related to the ZnS:Ag,Cl emission, however there was a prominent peak at 575nm which when further analysed with RBS and PIXE confirmed there had been contamination of manganese in the thin films.
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Ismail, Anas. "Etude et développement d'un système de dosimétrie in vivo implantable basé sur la radioluminescence du nitrure du gallium GaN." Phd thesis, Université Joseph Fourier (Grenoble), 2009. http://tel.archives-ouvertes.fr/tel-00452623.

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Cette thèse a pour objectif de caractériser un système dosimétrique in vivo implantable pour la radiothérapie externe capable de réaliser, en temps réel, une mesure directe de la dose absorbée dans le volume cible. Ce système, nommé SECURIDOSE, met en œuvre une sonde implantable qui comporte à son extrémité distale un cristal de nitrure de gallium radioluminescent. La transduction par radioluminescence du nitrure de gallium a été étudiée et ses performances intrinsèques ont été comparées avec celles d'autres techniques de transduction mises en œuvre en dosimétrie in vivo. Ce mode de transduction offre un avantage en termes de un rendement de transduction qui est de 100000 photons/MeV. Le GaN a un temps de réponse très court (<1ns). Son émission bande à bande dans le UV est bien adaptée à une mesure en temps réel de la dose. Son spectre d'émission est étroit ce qui facilité la réjection spectrale des luminescences parasites. Le système proposé offre une réponse linéaire avec la dose d'irradiation qui ne dépend pas du débit de dose. Cette réponse reste linéaire même pour des doses d'irradiation très supérieures à celles délivrées au patient. De plus, les sondes SECURIDOSE restent opérationnelles après un cycle de stérilisation Gamma avec une irradiation par une source de 60Co à une dose de 29 kGy. Le GaN n'a pas une dépendance angulaire. Le seul désavantage du système, est la dépendance à l'énergie du faisceau du fait que le GaN n'est pas équivalent tissu. Une variation de 4.5% de la réponse du système a été observée entre deux énergies de faisceaux de photons 6MV et 18MV.
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Alhelou, Nissrine. "Etude de verres pour la dosimétrie fibrée de rayonnements ionisants." Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R032/document.

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De nos jours, les dosimètres existants sont insuffisants pour la surveillance et le contrôle des rayonnements ionisants dans toutes les configurations et surtout en environnement sévère. En dosimétrie optique, les systèmes fibrés permettent de répondre en temps réel à des débits de dose relativement faibles, de réaliser des mesures dans des endroits difficiles d’accès, avec une résolution spatiale intéressante. Ce travail a consisté en l’étude de verres de silice élaborés par voie sol-gel et dopés par du cuivre ou du cérium ionique, en vue de les utiliser dans un dispositif dosimétrique. Ces verres ont été caractérisés par différentes techniques spectroscopiques avant et après irradiations. Dans le cas des verres dopés Cu, après irradiation X ou γ (1 MGy), les défauts HC1, HC2 et E’ ont été identifiés. Quant aux verres dopés Ce, ils sont plus résistants et restent incolores, même après une dose de 8,8 MGy sous X. Des mesures de la réponse optique des échantillons sous rayons X ont été réalisées grâce à un dispositif fibré. Concernant les verres dopés Cu, la sensibilité en radioluminescence (RL) couvre la gamme de débits de doses allant de 0,25 à au moins 800 mGy/s et la linéarité de la luminescence optiquement stimulée (OSL) a été démontrée entre 40 mGy et 200 Gy. Les verres dopés Ce sont plus performants en termes de linéarité. En effet, les signaux de RL et d’OSL sont linéaires jusqu’à 1,2 Gy/s et 500 Gy respectivement pour ce dopant. Un fading de l’OSL à court-terme a été mis en évidence avant stabilisation du signal. Les résultats obtenus montrent que ces verres dopés présentent un grand intérêt pour la dosimétrie fibrée de radiations ionisantes
Nowadays, existing dosimeters are insufficient for monitoring and control of ionizing radiation in all configurations and especially in severe environments. In optical dosimetry, fiber systems allow to provide a real-time response to relatively low dose rates, making possible some measurements in hard-to-reach places with interesting spatial resolution. This work consisted in the study of sol-gel silica glasses doped with ionic copper or cerium, with the aim of using them in a dosimetry device. These glasses have been characterized by different spectroscopic techniques before and after irradiations. In the case of Cu-doped glasses, after X or γ irradiation (1 MGy), the defects HC1, HC2 and E' have been identified. As for Ce-doped glasses, they are more resistant and remain colorless, even after a dose of 8.8 MGy under X. Measurements of the optical response from the samples under X-rays were carried out using a fibered device. For Cu-doped glasses, radioluminescence (RL) sensitivity covers dose rates ranging from 0.25 to at least 800 mGy/s and the linearity of optically stimulated luminescence (OSL) has been demonstrated in the range 40 mGy-200 Gy. Ce-doped glasses are more efficient in terms of linearity. Indeed, for this dopant, RL and OSL signals are linear up to 1.2 Gy/s and 500 Gy, respectively. Short-term OSL fading was observed before stabilization of the signal. The obtained results show that these doped glasses are of great interest for fibered dosimetry of ionizing radiations
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Books on the topic "Radioluminescenza"

1

Technology Transfer Conference (U.S.) (1990 Annapolis, Md.). Radioluminescent lighting technology: Technology Transfer Conference proceedings : September 25-26, 1990, Annapolis, Maryland. Washington, DC: The Office, 1990.

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1932-, Weber Marvin J., ed. Selected papers on phosphors, light emitting diodes, and scintillators: Applications of photoluminescence, cathodoluminescence, electroluminescence, and radioluminescence. Bellingham, Wash: SPIE Optical Engineering Press, 1998.

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Book chapters on the topic "Radioluminescenza"

1

Lauer, Tobias. "Radioluminescence (RL)." In Encyclopedia of Scientific Dating Methods, 685. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6304-3_104.

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Lauer, Tobias. "Radioluminescence (RL)." In Encyclopedia of Scientific Dating Methods, 1. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6326-5_104-2.

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Lauer, Tobias. "Radioluminescence (RL)." In Encyclopedia of Scientific Dating Methods, 1–2. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-6326-5_104-3.

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Sychov, M. M., A. G. Kavetsky, K. E. Bower, and V. M. Andreev. "Radioluminescent Glass Battery." In Ceramic Transactions Series, 13–21. 735 Ceramic Place, Westerville, Ohio 43081: The American Ceramic Society, 2012. http://dx.doi.org/10.1002/9781118370919.ch2.

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Ismail, Anas, Patrick Pittet, Guo-Neng Lu, Jean-Marc Galvan, Jean-Yves Giraud, and Jacques Balosso. "Implantable in vivo Dosimetric Probe Based on GaN Radioluminescence." In IFMBE Proceedings, 167–71. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03474-9_48.

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Carrasco, I., K. Bartosiewicz, F. Piccinelli, M. Nikl, and M. Bettinelli. "5d-4f Radioluminescence in Pr3+-doped K3YxLu1-x (PO4)2." In NATO Science for Peace and Security Series B: Physics and Biophysics, 489–90. Dordrecht: Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-0850-8_45.

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Ivanov, Andrei A., Sergei N. Tugarinov, Igor N. Rastyagaev, Vladimir N. Amosov, Yuri A. Kaschuck, Anatoli V. Krasilnikov, and Sergei E. Bender. "Investigation of the Fiber Optic Radiating Resistance and Radioluminescence Under Ir-8 Reactor Condition." In Diagnostics for Experimental Thermonuclear Fusion Reactors 2, 287–90. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5353-3_34.

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Sengupta, Debanti, and Guillem Pratx. "Radioluminescence Microscopy: A Quantitative Method for Radioisotopic Imaging of Metabolic Fluxes in Living Cancer Cells." In Methods in Molecular Biology, 45–53. New York, NY: Springer New York, 2019. http://dx.doi.org/10.1007/978-1-4939-9027-6_3.

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Santiago, M., M. Prokic, P. Molina, J. Marcazzó, and E. Caselli. "A Tissue-Equivalent Radioluminescent Fiberoptic Probe for In-Vivo Dosimetry Based on Mn-Doped Lithium Tetraborate." In IFMBE Proceedings, 367–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03902-7_104.

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Kavetsky, A., S. Nekhoroshkov, Y. Kaminski, G. Akulov, and S. Meleshkov. "Radioactive Materials, Ionizing Radiation Sources, and Radioluminescent Light Sources for Nuclear Batteries." In Polymers, Phosphors, and Voltaics for Radioisotope Microbatteries. CRC Press, 2002. http://dx.doi.org/10.1201/9781420041392.ch2.

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Conference papers on the topic "Radioluminescenza"

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Peyrot, Donald A., Jonathan Duquette, Roger A. Lessard, and Rene Roy. "Radioluminescence pumping." In Photonics North, edited by John C. Armitage, Roger A. Lessard, and George A. Lampropoulos. SPIE, 2004. http://dx.doi.org/10.1117/12.569056.

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Jacobsohn, L. G., B. L. Bennett, R. E. Muenchausen, M. S. Martin, L. Shao, Floyd D. McDaniel, and Barney L. Doyle. "Radioluminescence Investigation of Ion-Irradiated Phosphors." In APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twentieth International Conference. AIP, 2009. http://dx.doi.org/10.1063/1.3120206.

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Peyrot, D. A., R. Piché, R. A. Lessard, and R. Roy. "Fluorescence induced by radioluminescence and applications." In Photonics North 2006, edited by Pierre Mathieu. SPIE, 2006. http://dx.doi.org/10.1117/12.707953.

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Mrazek, J., M. Nikl, I. Kasik, O. Podrazky, J. Aubrecht, and A. Beitlerova. "Nanoparticle-doped radioluminescent silica optical fibers." In 15th Conference on Optical Fibers and Their Applications, edited by Jan Dorosz and Ryszard S. Romaniuk. SPIE, 2014. http://dx.doi.org/10.1117/12.2064818.

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Darafsheh, Arash. "Radioluminescent fiber probes for radiotherapy dosimetry." In Biosensing and Nanomedicine XII, edited by Hooman Mohseni and Massoud H. Agahi. SPIE, 2019. http://dx.doi.org/10.1117/12.2532233.

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Yagodin, V. V., A. V. Ishchenko, B. V. Shulgin, Yu F. Kargin, N. S. Akhmadullina, and A. S. Lysenkov. "Radioluminescent properties of Eu2+-doped aluminum oxynitride." In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2016): Proceedings of the III International Young Researchers’ Conference. Author(s), 2016. http://dx.doi.org/10.1063/1.4962608.

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Ignatovych, M., A. Kelemen, A. Peto, and O. Chuiko. "Photoluminescence and radioluminescence spectra of x-ray phosphors." In SPIE Proceedings, edited by Sergey V. Svechnikov and Mikhail Y. Valakh. SPIE, 2003. http://dx.doi.org/10.1117/12.497172.

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Darafsheh, Arash. "Fiber optic radioluminescent probes for radiation therapy dosimetry." In Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIX, edited by Israel Gannot. SPIE, 2019. http://dx.doi.org/10.1117/12.2510398.

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Mysiura, I., O. Kalantaryan, S. Kononenko, V. Zhurenko, and S. Bogatyrenko. "Application of radioluminescence technique for zirkonia powder and nanoceramics." In 2017 IEEE 7th International Conference "Nanomaterials: Application & Properties" (NAP). IEEE, 2017. http://dx.doi.org/10.1109/nap.2017.8190351.

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Doty, F. P., C. A. Bauer, P. G. Grant, B. A. Simmons, A. J. Skulan, and M. D. Allendorf. "Radioluminescence and radiation effects in metal organic framework materials." In Optical Engineering + Applications, edited by F. Patrick Doty, H. Bradford Barber, and Hans Roehrig. SPIE, 2007. http://dx.doi.org/10.1117/12.740829.

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Reports on the topic "Radioluminescenza"

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Tompkins, J. A., K. W. Haff, and F. J. Schultz. Radioluminescent (RL) airfield lighting system program. Office of Scientific and Technical Information (OSTI), September 1990. http://dx.doi.org/10.2172/6558379.

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Traub, R. J., and G. A. Jensen. Tritium radioluminescent devices, Health and Safety Manual. Office of Scientific and Technical Information (OSTI), June 1995. http://dx.doi.org/10.2172/89498.

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Jensen, G. A., and L. E. Leonard. Radioluminescent lighting for Alaskan runway lighting and marking. Office of Scientific and Technical Information (OSTI), March 1985. http://dx.doi.org/10.2172/5925933.

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Adrian, D. K., H. C. Pusey, G. A. Jensen, and R. J. Traub. Radioluminescent emergency egress lighting for US Navy surface ships. Office of Scientific and Technical Information (OSTI), December 1988. http://dx.doi.org/10.2172/6571277.

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Jensen, G. A. Acceptability testing of radioluminescent lights for VFR-night air taxi operations. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6244176.

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Jensen, G. A., R. F. Hazelton, R. E. Ellefson, and H. S. Carden. Assessment of end of life disposal, tritium recovery and purification strategies for radioluminescent lights. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/10103244.

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Jensen, G. A., R. F. Hazelton, R. E. Ellefson, and H. S. Carden. Assessment of end of life disposal, tritium recovery and purification strategies for radioluminescent lights. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/5977932.

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Radioluminescent lighting program description. Office of Scientific and Technical Information (OSTI), November 1987. http://dx.doi.org/10.2172/573285.

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