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Dissertations / Theses on the topic 'Scintillating crystal'

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Published: 4 June 2021

Last updated: 21 February 2023

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1

NATALI, PIER PAOLO. "Methods and Measurement Systems in Photoelastic Analysis of Scintillating Crystals. PWO and LYSO crystals." Doctoral thesis, Università Politecnica delle Marche, 2019. http://hdl.handle.net/11566/263506.

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La tesi è basata sulla cristallografia ottica, e in particolare sulla Fotoelasticità. I lavori precedenti partono dal polariscopio a luce diffusa, per implementare nuovi sistemi chiamati Conoscopia e Sfenoscopia laser in direzione parallela all’asse ottico. Queste nuove tecniche sono state studiate in maniera approfondita al fine di introdurre, come contributo innovativo, un’ottimizzazione dal punto di vista del sistema di misurazione e dell’analisi dei dati. Inoltre, è stato implementato, riguardo queste tecniche, un nuovo campo di applicazione, creando la possibilità di applicare la Conoscop

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2

Chernyak, Dmitry. "Development of cryogenic low background detector based on enriched zinc molybdate crystal scintillators to search for neutrinoless double beta decay of ¹⁰⁰Mo." Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112143/document.

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L’observation de la double désintégration bêta sans neutrinos (0ν2β) impliquerait la violation de la conservation du numéro leptonique, signe d’une nouvelle physique au-delà du Modèle Standard, et permettrait d’établir la nature de Majorana des neutrinos. Les bolomètres scintillants cryogéniques sont parmi les détecteurs les plus prometteurs pour rechercher ce processus nucléaire extrêmement rare dans des noyaux qui sont théoriquement entre les plus favorables.Des scintillateurs de ZnMoO₄ ayant une masse de ∼ 0.3 kg, ainsi que des cristaux de Zn¹⁰⁰ MoO₄ enrichi dans l’isotope ¹⁰⁰Mo, ont été pr

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3

Deniz, Muhammed. "Measurement Of Sm Electro-weak Parameters In Reactor Antineutrino-electron Scattering In Texono Experiment." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608386/index.pdf.

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In this thesis a search for electron type neutrino-electron scattering cross-section and Weinberg Angle measurements were performed at KS Nuclear Power Station with 200 kg CsI(Tl) scintillating crystal detector located at a distance of 28 m from the 2.9 GW reactor core giving total flux of 6:52X10^12 cm^-2s^-1 in average at the experimental site. New analysis techniques and background suppression methods were developed. In the region of 3-8 MeV a measurement of SM cross section of (1:235+-0.577) XR_SM and Weinberg Angle of 0:264 +-0.075 which is quite consistent with the SM value of 0.23120(15

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4

Vandenbussche, Vincent. "Étude et développement d'un imageur TEP ambulatoire pour le suivi thérapeutique individualisé en cancérologie." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112249/document.

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L'imagerie médicale remonte à la fin du XIXe siècle avec la découverte des rayons X par Röntgen. Depuis, de nombreuses modalités d'imagerie ont été développées, et sont aujourd'hui utilisées dans une large gamme d'indications cliniques. L'imagerie TEP (Tomographie par Émission de Positron) est une modalité fonctionnelle, quantitative et ayant une haute sensibilité, ce qui en fait une modalité de choix, notamment en cancérologie. Hélas, sa diffusion est freinée en comparaison avec le scanner ou l'imagerie par résonance magnétique, en raison de son coût notamment. C'est dans ce contexte que s'in

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5

Bora, Vaibhav Joga Singh. "Photon Statistics in Scintillation Crystals." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/577317.

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Scintillation based gamma-ray detectors are widely used in medical imaging, high-energy physics, astronomy and national security. Scintillation gamma-ray detectors are field-tested, relatively inexpensive, and have good detection efficiency. Semi-conductor detectors are gaining popularity because of their superior capability to resolve gamma-ray energies. However, they are relatively hard to manufacture and therefore, at this time, not available in as large formats and much more expensive than scintillation gamma-ray detectors. Scintillation gamma-ray detectors consist of: a scintillator, a ma

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6

Gridin, Sergii. "Channels of energy loss and relaxation in CsI : A (A=Tl, In) scintillation crystals." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10349/document.

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Ce travail est consacré à l'étude des processus de relaxation de l'énergie et des canaux de perte d'énergie dans les cristaux scintillateurs CsI:A (A = Tl, In). Dans le chapitre 1 les principaux processus d'interaction des rayonnements ionisants avec les solides luminescents sont discutés. Les méthodes expérimentales et techniques utilisées dans cette étude ainsi que les méthodes de synthèse, de caractérisation cristal, de pureté, etc sont présentées dans le chapitre 2. La deuxième section traite de la description des méthodes spectroscopiques d'analyse utilisées. Il comprend des techniques sp

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7

Shang, Huamei. "Solution based synthesis of CdWO₄ scintillation films /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/10584.

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8

Avella, Paola. "Characterisation of silicon photomultipliers coupled to inorganic scintillating crystals for timing applications." Thesis, University of Surrey, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.580335.

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Silicon Photo multipliers (SiPM) are solid-state photo detectors made of a matrix of Avalanche Photodiodes working in Geiger mode (GM-APD). Each APD behaves as a binary device, giving in output a standardised signal if fired by one or more photons. However, the device as a whole is an analog device, giving in output a pulse proportional to the number of incident photons. For this reason, the SiPM can be considered as a solid-state equivalent of the traditional Photomultiplier Tube (PMT), with the advantage of single photon counting capability, improved detection efficiency at wavelengths that

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9

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.

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10

Zolotarova, Anastasiia. "Study and selection of scintillating crystals for the bolometric search for neutrinoless double beta decay." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS293/document.

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L'observation de la désintégration double bêta sans émission de neutrino (0ν2β) fournirait des informations essentielles sur la nature du neutrino et son échelle de masse absolue. Ce processus consiste en la transformation simultanée de deux protons en deux neutrons avec l'émission de deux électrons et aucun neutrino. Cette transition n'est possible que si les neutrinos sont égaux aux antineutrinos (nature Majorana du neutrino). Les recherches pour une désintégration à ce point rare représentent un défi technique complexe, car les expériences de prochaine génération visent des sensibilités de

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11

Востоцький, Віталій Олексійович, Виталий Алексеевич Востоцкий, Vitalii Oleksiiovych Vostotskyi та Є. О. Козирєв. "Інтелектуальна система відмовостійкого керування вирощуванням сцинтиляційних монокристалів". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/25278.

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12

Востоцький, В. В., та Н. А. Дедик. "Гібридна інтелектуальна система керування вирощуванням сцинтиляційних монокристалів". Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/25269.

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Для вирішення сучасних завдань приладобудування, екологічного захисту навколишнього середовища від різного роду випромінювань, впровадження нових ідей і напрямів у галузі фізики високих енергій, медицини, астрофізики, космонавтики характерно широке використання сцинтиляційних монокристалів (МК). Метою наукової роботи є розроблення інформаційного та програмного забезпечення інтелектуальної гібридної системи класифікаційного керування технологічним процесом вирощування крупногабаритних лужно-галоїдних сцинтиляційних монокристалів. При цитуванні документа, використовуйте посилання http://essuir.s

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13

Wohlfahrt, Benjamin [Verfasser]. "Matching of avalanche photodiodes and light injection into scintillation crystals / Benjamin Wohlfahrt." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1198109092/34.

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14

Faraj, Sara. "Growth and characterization of Ce doped LuAG single crystal fibers by the micropulling down technique." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1030/document.

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Les fibres monocristallines d'oxyde de lutécium et aluminium (Lu3Al5O12 - LuAG), non dopées ou intentionnellement dopées au cérium, élaborées par la technique de micro-pulling down sont de sérieuses candidates pour le développement de nouvelles générations de calorimètres à scintillation. Cependant, cette technique de croissance est complexe et nécessite une étude approfondie pour améliorer les propriétés optiques de ces fibres. Après avoir ajusté la température de croissance, les paramètres principaux étudiés furent la concentration en Cerium, la vitesse de croissance et l'orientation du cris

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15

PEREIRA, MARIA C. C. "Desenvolvimento e caracterizacao do cristal cintilador de CsI(TI) utilizado como detector de radiacao." reponame:Repositório Institucional do IPEN, 1997. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10702.

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16

Sivers, Moritz von [Verfasser], Lothar [Akademischer Betreuer] Oberauer, and Hubert [Akademischer Betreuer] Kroha. "Scintillating CaWO4 Crystals for the Direct Dark Matter Search Experiments CRESST and EURECA / Moritz von Sivers. Gutachter: Lothar Oberauer ; Hubert Kroha. Betreuer: Lothar Oberauer." München : Universitätsbibliothek der TU München, 2014. http://d-nb.info/1054753040/34.

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17

Bruhn, Cecilia. "Production and Characterization of Scintillating CaWO$_4$ Single Crystals for Rare Event Searches CaWO$_4$ är latex kodning för att få till den kemiska formeln." Thesis, KTH, Fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-168012.

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18

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.

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19

Champion, Theresa Janet. "Quality assurance of CsI(TI) crystals for the Bâ†aBâ†aâ†r electromagnetic calorimeter, and a Monte Carlo study of the CP-violating channel B'0#â†>##pi#'+#pi#'-#pi#'0 for the Bâ†aBâ†aâ†r." Thesis, Brunel University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311547.

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20

Kononets, Valerii. "Croissance cristalline de cristaux scintillateurs de LGSO et de grenats à partir de l’état liquide par les techniques Czochralski (Cz) et micro-pulling down (μ-PD) et leurs caractérisations". Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10350/document.

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Des lots de scintillateurs orthosilicates et grenats dope terres rares ont été cristallisés par les méthodes micro-pulling down (μ-PD) et Czochralski. Pour la première fois des fibres Lu2xGd2 2xSiO5 dopées Ce (LGSO:Ce) (x = 0.5) ont été tirées par la méthode micro-pulling down (μ-PD). Dans le but de déterminer la concentration optimale de l'ion activateur avec les meilleurs paramètres de scintillation, la concentration du cérium dans le liquide a été variée dans l'intervalle 0.01-1.5 at%. La distribution spatiale des cations le long des cristaux LGSO :Ce tirés par la méthode de la micro-pullin

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21

Roth, Sabine [Verfasser], Franz von [Akademischer Betreuer] Feilitzsch та Andreas [Akademischer Betreuer] Ulrich. "The Potential of Neganov-Luke Ampliﬁed Cryogenic Light Detectors and the Scintillation-Light Quenching Mechanism in CaWO4 Single Crystals in the Context of the Dark Matter Search Experiment CRESST-II / Sabine Roth. Gutachter: Andreas Ulrich ; Franz von Feilitzsch. Betreuer: Franz von Feilitzsch". München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1043317341/34.

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22

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.

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23

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/.

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Cintiladores inorgânicos com tempo de decaimento de luminescência rápido, densidade alta e boa produção de luz têm sido objeto de estudos para aplicações em física nuclear, física de energias altas, tomografia nuclear e outros campos da ciência e da engenharia. Cristais de cintilação baseados em iodeto de césio (Csl) são materiais que apresentam higroscopia relativamente baixa, número atômico alto, fácil manuseio e custo baixo, características que favorecem o seu uso como detectores de radiação. Neste trabalho descreve-se a obtenção de cristais Csl puro, Csl:Br e Csl:Pb, utilizando-se a técnic

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24

MONTALTO, LUIGI. "Inspection and characterization of birefringent materials: development of methods and systems for scintillating anisotropic crystals." Doctoral thesis, 2017. http://hdl.handle.net/11566/245539.

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Un cristallo scintillatore ha la peculiare capacità di convertire, in luce visibile, l'energia di una particella radiante che interagisce con il suo volume. L'eccitazione può derivare da diversi tipi di radioattività o interazione energetica che è in grado di eccitare gli elettroni in modo da farli saltare ad una banda di energia più alta e tornare indietro al loro stato di equilibrio. Questo meccanismo porta ad un rilascio di fotoni nel visibile (e vicino visibile). La luce prodotta dal cristallo è solitamente monocromatica e rappresenta il prodotto della conversione dell'energia incidente in

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25

Cutler, Paul A. "Synthesis and Scintillation of Single Crystal and Polycrystalline Rare-Earth-Activated Lutetium Aluminum Garnet." 2010. http://trace.tennessee.edu/utk_gradthes/695.

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Single crystals with composition Lu3Al5O12 were synthesized using Czochralski and micro-pulling-down melt growth techniques. Polycrystalline ceramics of the same composition were synthesized by vacuum annealing of powders prereacted using a citrate-nitrate combustion technique and by spark-plasma-sintering of powders prereacted using a flame-spray-pyrolysis technique. Single crystals and polycrystalline ceramics are activated with Ce3+ or Pr3+ or doubly activated with Ce3+ and Tb3+ ions. Cerium-doped Czochralski-grown single crystals were compared to cerium-terbium codoped Czochralski-grown an

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26

Lee, Kai-Ping, and 李凱平. "Research of single crystal growth and scintillation performance of Ce:(Lu(1-X)YX)2SiO5(Ce:LYSO) scintillator." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/08561697358295725219.

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碩士<br>國立中山大學<br>材料與光電科學學系研究所<br>99<br>Single crystals of cerium doped lutetium yttrium orthosilicate scintillator (Ce:(Lu(1-X)YX)2SiO5; Ce:LYSO) were grown through Czochralski method to investigate the affection of different growth conditions on the crystal growth. The relationship between thermal field and crystal growth was investigated. Different growth parameters and insulating system were adopted and compared to decrease the temperature gradient. It is found that the new insulating bricks can decrease effectively the temperature gradient and solve the crack problem of grown crystal. The r

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27

Schellenberg, Graham. "An algorithm for automatic crystal identification in pixelated scintillation detectors using thin plate splines and Gaussian mixture models." 2016. http://hdl.handle.net/1993/31103.

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Positron emission tomography (PET) is a non-invasive imaging technique which utilizes positron-emitting radiopharmaceuticals (PERs) to characterize biological processes in tissues of interest. A PET scanner is usually composed of multiple scintillation crystal detectors placed in a ring so as to capture coincident photons from a position annihilation. These detectors require a crystal lookup table (CLUT) to map the detector response to the crystal of interaction. These CLUTs must be accurate, lest events get mapped to the wrong crystal of interaction degrading the final image quality. This wor

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28

Longo, Savino. "Measurements of the Radiation Hardness of CsI(Tl) Scintillation Crystals and Comparison Studies with Pure CsI for the Belle II Electromagnetic Calorimeter." Thesis, 2015. http://hdl.handle.net/1828/6707.

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In preparation for the large backgrounds expected to be present in the Belle II detector from the SuperKEKB e+e- collider, the radiation hardness of several large (5 x 5 x 30 cm3) thallium doped cesium iodide (CsI(Tl)) scintillation crystals are studied. The crystal samples studied consist of 2 spare crystals from the Belle experiment using PIN diode readout and 7 spare crystals from the BaBar experiment using photomultiplier tube readout. The radiation hardness of the scintillation properties of the CsI(Tl) crystals was studied at accumulated 1 MeV photon doses of 2, 10 and 35 Gy. At each

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