Inorganic Scintillation Crystals for Neutron Detection

Pereira, Maria da Conceição Costa; Filho, Tufic Madi; Cardenas, Jose Patricio Nahuel

doi:10.1109/tns.2016.2551379

Cited by 2 publications

(4 citation statements)

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“…Recent advancements have brought 6 Li-based scintillators with Elpasolite (double perovskite) structures to the forefront, primarily due to their exemplary neutron/gamma dual-mode detection capabilities. [1][2][3] Notably, the Cs 2 6 LiLaBr 6 :Ce (CLLB:Ce) scintillator exhibits high energy resolution (2.9%), superior light output (180 000 photons/neutron and 60 000 photons/MeV gamma), and good pulse shape discrimination (PSD) capabilities. [4,5] Such attributes render it invaluable in homeland security, nuclear monitoring, and exploratory well logging.…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction

Cai,

Yin,

Zhang

et al. 2024

Cryst. Res. Technol.

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Ce‐doped Cs2LiLaBr6 (CLLB) scintillator crystals, known for their superior neutron/gamma dual‐mode detection capability and exceptional scintillation properties, have garnered significant attention for both fundamental science and practical applications. The role of Ce3+ cations as luminescent centers is pivotal, influencing the scintillation properties as their concentration varies. While the effects of Ce3+ concentration on scintillation performance are well‐documented, the ramifications for crystalline structure remain less explored. In this study, high‐quality CLLB:Ce single crystals are fabricated(atomic packing factor of maximum doped Ce is 0.04%) using the vertical Bridgman (VB) method and subsequently characterized their crystalline structure by neutron diffraction, X‐ray diffraction (XRD), and elemental analysis. The findings reveal a correlation between Ce3+ concentration and the crystal cell parameters, presenting intriguing deviations from Vegard's law. Such observations suggest the potential presence of alternative defects, potentially Li+ interstitials, in CLLB:Ce. This work offers critical insights for advancing the understanding and optimization of CLLB:Ce scintillators.

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Section: Introductionmentioning

confidence: 99%

Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction

Cai,

Yin,

Zhang

et al. 2024

Cryst. Res. Technol.

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“…Cristais em matriz CsI são aplicados na detecção de raios gama, raios X, elétrons, partículas alfa e nêutrons. E considerando a escassez do isótopo 3 He, material comumente utilizado na detecção de nêutrons, o cintilador inorgânico em matriz CsI capaz de detectar nêutrons de forma eficiente pode ser uma alternativa para este setor [8,9].…”

Section: Detectores De Radiação E Cintiladoresunclassified

“…Os estudos com cristais CsI:Li buscam, também, atender a demanda de mercado por novos materias detectores de nêutrons, que possam ser obtidos em diversas configurações geométricas e de custo relativamente baixo. Desta maneira, cristais CsI:Li poderão contribuir com os diversos setores que fazem o emprego da tecnologia de nêutrons [9,12].…”

Section: Detectores De Radiação E Cintiladoresunclassified

“…Ainda no ano de 1948 Robert Hofstadter[40] demonstrou que o cristal inorgânico de iodeto de césio dopado com tálio (NaI:Tl) possuía um ótimo rendimento na produção de luz e muito superior aos outros materiais empregados na época[20,39,41]. CsI, os cristais BGO possuem maior número atômico, tendo aplicabilidade em equipamentos de tomografia de emissão positrônica, da sigla em inglês PET[8,9]. Ainda na década de 1980 outro cristal de haleto alcalino foi descoberto o fluoreto de bário (BaF2), também foram propostos cristais baseados em cério como elemento dopante como o ortosilicato de gadolínio dopado com cério (GSO:Ce) e outros[6,7,21].Nas décadas seguintes até a atual década de realização deste trabalho, os avanços relacionados a novos cristais cintiladores estão ligados as composições complexas associadas ao dopante cério, por exemplo, GYAG:Ce, CeLaBr3, e os mais recentes LiCaAlF6, SrI2:Eu, YbNi4P2 e ainda os denominados cristais elpasolitas Cs2YLiCl6:Ce, cristal Cs2NaAlF6:Cr e Cs2NaGaF6:Fe[42,43,44,45,46,47,48,49].3.3.1 Mecanismo de emissão de luminescência em cintiladores inorgânicosA emissão de fótons de luz em cristais cintiladores inorgânicos está diretamente ligada aos estados de energia definidos pela rede cristalina do material cintilador.…”

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Otimização do crescimento de cristais cintiladores inorgânicos em matriz CsI dopada com lítio para uso como detectores de radiação

Tomaz¹

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TOMAZ, L. F. Optimization of growth of the inorganic scintillators crystals in CsI matrix doped with lithium for use as radiation detectors. 2019. 100 p. Dissertação (Mestrado em Tecnologia Nuclear)-Instituto de Pesquisas Energéticas e Nucleares-IPEN-CNEN/SP. São Paulo. Scintillators are solid, liquid or gaseous materials capable of efficiently converting high energy radiation into radiation in the ultraviolet or visible spectrum, by partially or totally absorbing the incident radiation. Regarding the investigation of scintillating crystals, the inorganics occupy considerable space in the group of scintillators used in the areas of work with radiation and they are applied as detectors. The objective of this work was to develop inorganic scintillation crystals in the CsI matrix using the lithium ion (Li +) as a doping element, in concentrations of 10-1 M, 10-2 M, 10-3 M and 10-4 M, by means of the Bridgman technique. The behavior of the crystals was studied by exciting them with different energy levels of alpha radiation, gamma radiation and also, with neutron radiation and the results were compared to the pure CsI matrix. The crystals were excited with gamma radiation in the energy range of 59 keV to 1333 keV, alpha radiation with energy 5.54 MeV and neutron radiation with energy of 1 MeV to 12 MeV. The CsI:Li crystals were, also, subjected to physical and chemical characterization, such as: optical transmittance, emission of luminescence, distribution of Li dopant along the growth axis and confirmation of the crystal structure. Lithium doped crystals showed better response to alpha radiation when compared to pure CsI crystal and sensitivity increases as the dopant Li concentration also increased, crystals CsI:Li with concentrations of 10-2 M and 10-3 M presented the best pulse height for gamma radiation. CsI: Li crystals showed sensitivity to neutron detection, with counts volume significantly higher than pure CsI crystal. The CsI:Li 10-3 M and 10-2 M crystals showed better neutron radiation detection in the Li doping concentration range studied. Addition of Li to the CsI matrix resulted in crystals with promising results for use as detectors, when excited with gamma, alpha and neutron radiation.

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Inorganic Scintillation Crystals for Neutron Detection

Cited by 2 publications

References 10 publications

Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction

Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction

Otimização do crescimento de cristais cintiladores inorgânicos em matriz CsI dopada com lítio para uso como detectores de radiação

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Inorganic Scintillation Crystals for Neutron Detection

Cited by 2 publications

References 10 publications

Crystal Growth and Structural Characterization of Cs2LiLaBr6:Ce Using Neutron Diffraction

Crystal Growth and Structural Characterization of Cs2LiLaBr6:Ce Using Neutron Diffraction

Otimização do crescimento de cristais cintiladores inorgânicos em matriz CsI dopada com lítio para uso como detectores de radiação

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Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction

Crystal Growth and Structural Characterization of Cs₂LiLaBr₆:Ce Using Neutron Diffraction