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中子探测用钾冰晶石型闪烁晶体研究进展
作者:王晴晴1 2 任国浩2 
单位:1. 上海大学材料科学与工程学院 上海 200444 2. 中国科学院上海硅酸盐研究所 上海 201800 
关键词:钾冰晶石型晶体 中子探测 Gamma射线探测 闪烁性能 
分类号:O7
出版年,卷(期):页码:2016,44(3):457-463
DOI:10.14062/j.issn.0454-5648.2016.03.18
摘要:

能够同时对中子和Gamma射线进行分辨和探测是当今辐射探测技术的一个重要研究课题。在众多闪烁晶体材料中,具有钾冰晶石结构的碱金属稀土卤化物是少数具备这种功能的材料之一。介绍了钾冰晶石型闪烁晶体Cs2LiYCl6:Ce、Cs2LiLaCl6:Ce、Cs2LiYBr6:Ce、Cs2LiLaBr6:Ce的研究进展,阐述了Cs2LiYCl6:Ce晶体在热中子和Gamma射线激发下的闪烁性能、n/?分辨能力和可能存在的4种闪烁机制。Radiation Monitoring Devices生长的Cs2LiYCl6:Ce的1 in晶体在662 keV处能量分辨率达到3.6%,该晶体可望成为在混合场中同时对中子和Gamma射线进行分辨和探测的实用晶体。

 

 The simultaneous detection and discrimination of neutron and gamma rays is an important research topic of the exsiting radiation detection technology. A few of alkali rare earth halides with an elpasolite structure are regarded as one of materials that are qualified for these functions among all scintillation crystals. In this review, recent development of elpasolite scintillation crystals, i.e., Ce-doped Cs2LiYCl6, Cs2LiLaCl6, Cs2LiYBr6, and Cs2LiLaBr6, were introduced. The scintillation and n/? discrimination properties of Cs2LiYCl6:Ce crystal excited with thermal neutron and Gamma-rays as well as the four types of luminescence mechanism for the crystal were elaborated. The size and properties Cs2LiYCl6:Ce grown by the radiation monitoring devices are at the optimum level. The energy resolution of its 1 inch crystal is 3.6% at 662 keV. It is indicated that Cs2LiYCl6:Ce could become one of the most promising scintillators for the detection of both neutron and Gamma-ray in a complex radiation field.

 
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基金项目:
国家自然科学基金(11475242)面上项目资助。
作者简介:
王晴晴(1991—),女,硕士研究生。
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