Дисертації з теми "Scintillation material"
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Sablayrolles, Jean. "De l'ultraviolet à l'infrarouge : caractérisation spectroscopique de matériaux type borate et oxyborate dopés à l'ytterbium trivalent." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2006. http://tel.archives-ouvertes.fr/tel-00289293.
Повний текст джерелаKoudela, Oldřich. "Kontrast v obraze získaném pomocí scintilačního detektoru sekundárních elektronů ve VP SEM." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219044.
Повний текст джерелаMcKinlay, Karen J. "The production and characterisation of scintillating fluoride glasses." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299541.
Повний текст джерелаNelson, Peter C. "Lithium gadolinium borate in plastic scintillator as an antineutrino detection material." Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Jun/10Jun%5FNelson.pdf.
Повний текст джерелаThesis Advisor(s): Smith, Craig F. ; Second Reader: Bowden, Nathaniel S. "June 2010." Description based on title screen as viewed on July 16, 2010. Author(s) subject terms: Antineutrino detection, Inverse Betad Decay, neutron capture, lithium gadolinium borate. Includes bibliographical references (p. 71-73). Also available in print.
Harrison, Mark J. "The effects of using aliovalent doping in cerium bromide scintillation crystals." Diss., Manhattan, Kan. : Kansas State University, 2009. http://hdl.handle.net/2097/1322.
Повний текст джерелаKrishnakumar, Renuka [Verfasser], Wolfgang [Akademischer Betreuer] Ensinger, and Christina [Akademischer Betreuer] Trautmann. "Scintillation screen materials for beam profile measurements of high energy ion beams / Renuka Krishnakumar. Betreuer: Wolfgang Ensinger ; Christina Trautmann." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2016. http://d-nb.info/1113183454/34.
Повний текст джерелаMathis, 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.
Повний текст джерелаKrauser, Maike de Oliveira [UNESP]. "Efeito da microestrutura na cintilação de nanopartículas de Y2O3 : EU3+." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/97927.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Neste trabalho avaliou-se o efeito da microestrutura na cintilação de nanopartículas de Y2O3:Eu3+. Neste contexto utilizam-se dois métodos de síntese, o método Pechini, que apresenta matéria orgânica remanescente de síntese, assim como, aglomerados micrométricos constituídos de partículas nanométricas com variação da forma e tamanho. Utilizando o método de precipitação homogênea modificado, estudou-se a influência de partículas com estreita distribuição de tamanho e morfologia esférica. A estrutura apresenta simetria cubica (grupo espacial Ia3) e com os estudos espectroscópicos caracterizou-se a presença de pelo menos dois sítios de simetria sendo eles C2 e S6. Avaliou-se o efeito da temperatura de tratamento térmico de 700 a 1100 ºC na cristalinidade do material através de difratometria de raios x do pó. Por meio da espectroscopia de luminescência com excitação de raios X, avaliou-se o efeito da microestrutura do material na cintilação. Por meio da área integrada da transição 5D0→7F2 observou-se a relação da intensidade de emissão com as temperaturas de tratamento térmico e com o tamanho de cristalito, calculados pela equação de Scherrer. Observou-se o efeito de defeitos na cintilação das partículas, pois, em menores temperaturas de tratamento térmico e/ou menores tamanhos de cristalitos os defeitos presentes no material se apresentam em maiores proporções, deste modo proporcionando mecanismos não radiativos de recombinação. Utilizando as curvas de danos de radiação pode-se caracterizar algumas etapas envolvidas na cintilação, como a criação de defeitos, que apresentaram dependência com o tamanho de cristalito obtido para o método Pechini. Após longos períodos sob radiação X os materiais apresentam intensidade de emissão inalterada ou até mesmo um aumento significativo, comportamento que depende dos mecanismos de...
In this work one consider the effects of microstructure in the scintillations properties of Y2O3:Eu3+. Two preparation methods were used; the Pechini method, which exhibits remaining organic matter derived from the synthesis, and tends to form agglomerates of nanoparticles with variable shape and size. By using a modified method of homogeneous precipitation one studied the effects of spherical particles with narrow distribution of particle size in its scintillation properties. The Y2O3 presents cubic symmetry (Ia3 space group) and with spectroscopy results at least two Y3+ symmetry sites were identified, a C2 and a S6 site. The firing temperature of the samples (700- 1100oC) was correlated with its crystallinity by X-ray diffractometry data. The relation between the integrated emission intensity of 5D0 ® 7F2 transition and the firing temperature or the Scherrer crystallite size were analyzed, and from these results were observed the influence of defects in the scintillation of particles, since in lower firing temperatures and/or lower crystallite sizes defects are presented in higher concentrations, leading to non-radiactive paths of pairs recombination. By using radiation damage measurements it was possible to identify the steps involved in the scintillation process, as the creation of defects, which presents a direct relation with the particles characteristics. After a long exposition time to the incoming ionizing radiation, the materials present constant scintillation intensity or a linear growth by means of recovery processes. Samples prepared by the homogeneous precipitation presented higher scintillation intensity and a higher recovery ability when fired at high temperatures. A comparison between the two methods in relation to crystallinity (firing temperature of 1100oC) revels similar results, however spherical particles presented higher scintillation intensity and... (Complete abstract click eletronic access below)
Krauser, Maike de Oliveira. "Efeito da microestrutura na cintilação de nanopartículas de Y2O3 : EU3+ /." Araraquara : [s.n.], 2011. http://hdl.handle.net/11449/97927.
Повний текст джерелаAbstract: In this work one consider the effects of microstructure in the scintillations properties of Y2O3:Eu3+. Two preparation methods were used; the Pechini method, which exhibits remaining organic matter derived from the synthesis, and tends to form agglomerates of nanoparticles with variable shape and size. By using a modified method of homogeneous precipitation one studied the effects of spherical particles with narrow distribution of particle size in its scintillation properties. The Y2O3 presents cubic symmetry (Ia3 space group) and with spectroscopy results at least two Y3+ symmetry sites were identified, a C2 and a S6 site. The firing temperature of the samples (700- 1100oC) was correlated with its crystallinity by X-ray diffractometry data. The relation between the integrated emission intensity of 5D0 ® 7F2 transition and the firing temperature or the Scherrer crystallite size were analyzed, and from these results were observed the influence of defects in the scintillation of particles, since in lower firing temperatures and/or lower crystallite sizes defects are presented in higher concentrations, leading to non-radiactive paths of pairs recombination. By using radiation damage measurements it was possible to identify the steps involved in the scintillation process, as the creation of defects, which presents a direct relation with the particles characteristics. After a long exposition time to the incoming ionizing radiation, the materials present constant scintillation intensity or a linear growth by means of recovery processes. Samples prepared by the homogeneous precipitation presented higher scintillation intensity and a higher recovery ability when fired at high temperatures. A comparison between the two methods in relation to crystallinity (firing temperature of 1100oC) revels similar results, however spherical particles presented higher scintillation intensity and... (Complete abstract click eletronic access below)
Orientador: Marian Rosaly Davolos
Coorientador: Marco Aurélio Cebim
Banca: Flávio Maron Vichi
Banca: Vera Regina Leopoldo Constantino
Mestre
Colbaugh, Katherine E. "Czochralski Growth of Doped Yttrium Aluminum Garnet (Y3Al5O12) Crystals and Oxygen Tracer Diffusion Analysis by ToF-SIMS and LEAP." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1429182946.
Повний текст джерелаSalvagnini, Claudio. "Thrombin inhibitors grafting on polyester membranes for the preparation of blood-compatible materials." Université catholique de Louvain, 2005. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-11232005-103604/.
Повний текст джерелаAdell, Barbarà Irina. "Ce or Pr-doped type III KGd(PO3)4 crystalline materials. Growth and characterization as scintillators." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668444.
Повний текст джерелаLos materiales centelleadores son ampliamente utilizados como detectores en los sistemas de detección de diversas aplicaciones, como la imagen médica, la física de alta energía, la astrofísica y en pruebas no destructivas (seguridad aeroportuaria, control industrial, etc.). Hay varios requisitos importantes para evaluar favorablemente el rendimiento de un centelleador. Dado que no existe el centelleador ideal, se están dedicando muchos esfuerzos para buscar nuevos centelleadores inorgánicos con mejores propiedades que los de los centelleadores existentes. En esta tesis, se crecen monocristales con alta calidad cristalina de KGd(PO3)4 tipo III dopados con Ce3+ y Pr3+, y también nanocristales de Pr:KGd(PO3)4 tipo III para posteriormente caracterizarlos estructuralmente y ópticamente como posibles nuevos materiales centelleadores. Estos monocristales se crecen a partir de soluciones de alta temperatura mediante la técnica Top Seeded Solution Growth-Slow Cooling (TSSG-SC) y los nanocristales se sintetizan mediante el método de Pechini. La caracterización estructural incluye la morfología cristalina, estabilidad y expansión térmicas, distribución de tamaño de las partículas, entre otros. Se estudia con detalle la espectroscopia de las transiciones 4f-5d, sobre las que se basa el mecanismo de centelleo. Incluye medidas de absorción óptica, medidas de luminiscencia y del tiempo de decaída de ésta excitando con luz de sincrotrón en el rango espectral desde el ultravioleta de vacío hasta el ultravioleta (VUV-UV), medidas de radioluminiscencia excitando con rayos X, entre otros. Además, se proporcionan los datos espectroscópicos básicos de los monocristales de Pr:KGd(PO3)4 tipo III para aplicaciones láser en la gama de longitud de onda visible basadas en las transiciones electrónicas 4f-4f. También, se determina la región de cristalización primaria de KYP4O12 tipo B y de KY(PO3)4 tipo IV en el sistema ternario K2O-Y2O3-P2O5, ya que son candidatos interesantes para actuar como matriz para iones lantánidos activos en aplicaciones de centelleo.
Scintillators materials are widely used as detectors in the detection systems of a variety of applications, such as medical imaging, high energy physics, astrophysics and non-destructive testing (airport security, industrial control, etc.). There are several important requirements to evaluate favourably the performance of a scintillator. Since the ideal scintillator does not exist, many efforts are dedicated to find new inorganic scintillators with better properties than those of the existing scintillators. Here, Ce3+- and Pr3+-doped type III KGd(PO3)4 bulk single crystals with high crystalline quality and type III Pr:KGd(PO3)4 nanocrystals are grown and structurally and optically characterized as possible new scintillator materials. These bulk single crystals are grown from high temperature solutions by the Top Seeded Solution Growth-Slow Cooling (TSSG-SC) technique, while the nanocrystals are synthesized by the Pechini method. The structural characterization includes the crystal morphology, thermal stability, thermal expansion, particle size distribution, among others. The spectroscopy of the 4f–5d transitions, on which the scintillation mechanism is based, is studied in detail. The spectroscopic characterization includes optical absorption measurements, luminescence and decay time measurements under synchrotron vacuum ultraviolet-ultraviolet (VUV-UV) excitation, radioluminescence measurements after synchrotron X-ray irradiation, among others. In addition, the basic spectroscopic data of the type III Pr:KGd(PO3)4 crystal for lasing applications in the visible wavelength range based on the 4f–4f electronic transitions is provided. Moreover, the primary crystallization region of type B KYP4O12 and type IV KY(PO3)4 in the K2O–Y2O3–P2O5 ternary system is determined, since these are interesting candidates as hosts for active lanthanide ions in scintillation applications.
Tiras, Emrah. "Search for heavy Majorana neutrinos in pp collisions at √s = 8 TeV with the CMS detector & photodetector and calorimeter R&D for particle colliders." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5864.
Повний текст джерелаBarta, Meredith Brooke. "Nanocomposite glass-ceramic scintillators for radiation spectroscopy." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45851.
Повний текст джерелаDeyglun, Clément. "Détection de matière nucléaire par interrogation neutronique avec la technique de la particule associée." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENY058.
Повний текст джерелаThis thesis investigates the detection of Special Nuclear Materials (SNM) by neutroninterrogation with the Associated Particle Technique (APT). 14 MeV neutrons areproduced from the 3H(2H,n)α fusion reaction in a sealed tube neutron generatorembedding a position-sensitive alpha detector. The alpha detector determines thedirection of the nearly opposite neutron and its time of flight. The detection of at leastthree prompt fission particles in coincidence with the tagged neutron signs the presenceof SNM. The acquisition system and simulation tools have been qualified in passive modewith radioactive sources and active mode with the generator and various targets,validating the simulation of inspection systems with MCNP-PoliMi. Calculations showthat the detection of a few kilograms of shielded SNM with the ATP is possible in ironcargo container, with the prompt fission neutrons signal. Detection is more difficult inorganic matrices due to tagged- and prompt fission neutrons scattering on hydrogennuclei. Furthermore, the use of plastic scintillators instead of 3He counters was studied tocharacterize the plutonium in the radioactive waste by passive coincidences measurement.Measurements at fast time scales of fast-neutrons instead of the long time scales ofthermal-neutrons reduce random coincidences that can occur with high (,n) reactionrate. The scintillators are however sensitive to gamma rays and cross-talk betweenadjacent detectors. Therefore, we used data-analysis algorithms to minimize cross-talkcontribution to measured three-fold coincidences
DOMIENIKAN, CLAUDIO. "Desenvolvimento de um espectrômetro de correlação angular gama-gama perturbada com seis detectores de BaF2 e estudo de interações hiperfinas em composto intermetálico LaMnSi2." reponame:Repositório Institucional do IPEN, 2016. http://repositorio.ipen.br:8080/xmlui/handle/123456789/26948.
Повний текст джерелаMade available in DSpace on 2016-12-22T16:42:56Z (GMT). No. of bitstreams: 0
Neste trabalho foi desenvolvido um Espectrômetro de Correlação Angular Gama- Gama Perturbada Diferencial em Tempo (CAP) constituído por seis detectores cintiladores de BaF2, para realização de medidas de interações hiperfinas (campo hiperfino magnético e gradiente de campo elétrico) em diversos materiais e propiciar estudos na área da física da matéria condensada. O espectrômetro desenvolvido possui um sistema de aquisição não convencional em comparação aos demais equipamentos destinados a medidas de CAP. Ao invés do tradicional Analisador Multicanal (MCA), este espectrômetro utiliza um sistema de aquisição de dados constituído, basicamente, por um Conversor Analógico Digital (ADC) rápido, uma placa digital (I/O) convencional e um roteador construído no laboratório de Interações Hiperfinas (LIH) do IPEN. Este versátil e eficiente sistema, controlado por um software também criado no LIH em LabVIEW, permite a geração simultânea de 30 espectros de coincidências γ - γ atrasadas, número superior em comparação aos 12 espectros do antigo espectrômetro de quatro detectores. Além de medidas de linearidade, resolução em tempo e tempo morto, o funcionamento e o desempenho do espectrômetro foram comprovados através de medidas de CAP utilizando os núcleos de prova 111In -> 111Cd e 181Hf -> 181Ta, cujos resultados são bem conhecidos da literatura. Foram feitas medidas de interação quadrupolar do 181Ta em háfnio metálico e do 111Cd em cádmio metálico, e de campo hiperfino magnético do 111Cd e do 181Ta em níquel. Os resultados destas medidas se mostraram em concordância com a literatura. Adicionalmente foram realizadas medidas inéditas de interações hiperfinas magnéticas no composto intermetálico LaMnSi2 utilizando os núcleos de prova 111Cd e 140Ce. As medidas foram realizadas na faixa de temperatura de 10 K a 400K. No caso das medidas utilizando a sonda 111In -> 111Cd, os resultados mostram uma variação do campo magnético com a temperatura que segue a função de Brillouin. Já no caso das medidas com o núcleo de prova 140La -> 140Ce, o resultado apresentou um comportamento anômalo do campo hiperfino em função de temperatura. Os resultados evidenciam uma forte hibridização da banda 4f do Ce com a banda 3d do Mn, fato verificado e estudado em trabalhos anteriores com compostos semelhantes.
Tese (Doutorado em Tecnologia Nuclear)
IPEN/T
Instituto de Pesquisas Energéticas e Nucleares - IPEN-CNEN/SP
PEREIRA, MARIA da C. C. "Desenvolvimento de cristais baseados em iodeto de césio para aplicação como detectores de radiação." reponame:Repositório Institucional do IPEN, 2006. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11434.
Повний текст джерелаMade available in DSpace on 2014-10-09T14:06:37Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Pereira, Maria da Conceição Costa. "Desenvolvimento de cristais baseados em iodeto de Césio para aplicação como detectores de radiação." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-16052012-084114/.
Повний текст джерелаInorganic scintillators with fast luminescence decay time, high density and high light output have been the object of studies for application in nuclear physics, high energy physics, nuclear tomography and other fields of science and engineering. Scintillation crystals based on cesium iodide (CsI) are matters with relatively low higroscopy, high atomic number, easy handling and low cost, characteristics that favor their use as radiation detectors. In this work, the growth of pure CsI crystals, CsI:Br and CsI:Pb, using the Bridgman technique, is described. The concentration of the bromine doping element (Br) was studied in the range of 1,5x10-1 M to 10-2 M and the lead (Pb) in the range of 10-2 M to 5x10-4 M. To evaluate the scintillators developed, systematic measurements were carried out for luminescence emission and luminescence decay time for gamma radiation, optical transmittance assays, Vickers micro-hardness assays, determination of the doping elements distribution along the grown crystals and analysis of crystals response to the gamma radiation in the energy range of 350 keV to 1330 keV and alpha particles from a 241Am source, with energy of 5.54 MeV. It was obtained 13 ns to 19 ns for luminescence decay time for CsI:Br and CsI:Pb crystals. These results were very promising. The results obtained for micro-hardness showed a significant increase in function of the doping elements concentration, when compared to the pure CsI crystal, increasing consequently the mechanical resistance of the grown crystals. The validity of using these crystals as radiation sensors may be seen from the results of their response to gamma radiation and alpha particles.
Peak, Jonathan Daniel. "Thin Film Combinatorial Synthesis of Advanced Scintillation Materials." 2010. http://trace.tennessee.edu/utk_graddiss/903.
Повний текст джерелаKrishnakumar, Renuka. "Scintillation screen materials for beam profile measurements of high energy ion beams." Phd thesis, 2016. https://tuprints.ulb.tu-darmstadt.de/5504/1/Dissertation.pdf.
Повний текст джерелаCutler, Paul A. "Synthesis and Scintillation of Single Crystal and Polycrystalline Rare-Earth-Activated Lutetium Aluminum Garnet." 2010. http://trace.tennessee.edu/utk_gradthes/695.
Повний текст джерелаGillard, Scott James. "Physical vapor deposition and defect engineering of europium doped lutetium oxide." Thesis, 2017. https://hdl.handle.net/2144/23674.
Повний текст джерелаSheats, Emily Ann. "Synthesis and Structure of Li6Y(BO3)3 as a Neutron Scintillator." 2007. http://etd.utk.edu/2007/SheatsEmily.pdf.
Повний текст джерелаStrohmeyer, Daniel C. "Feasibility Study of a Portable Coupled 3He Detector with LaBr3 Gamma Scintillator for Field Identification and Quantification of Nuclear Material." 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7983.
Повний текст джерелаΜιχαήλ, Χρήστος. "Experimental and theoretical determination of the imaging characteristics in new phosphor-scintillator materials with cerium (Ce3+) activators applied in medical digital detectors." Thesis, 2006. http://nemertes.lis.upatras.gr/jspui/handle/10889/1388.
Повний текст джерелаYang, Kan. "DISCOVERY AND DEVELOPMENT OF RARE EARTH ACTIVATED BINARY METAL HALIDE SCINTILLATORS FOR NEXT GENERATION RADIATION DETECTORS." 2011. http://trace.tennessee.edu/utk_graddiss/1147.
Повний текст джерела