大尺寸Cs_(2)LiYCl_(6)∶Ce晶体的制备与性能研究  

Preparation and Properties of Large Size Cs_(2)LiYCl_(6):Ce Crystal

作　　者：赵美丽 孙涛峰 高璠 宫红影 臧晓微[1] 桂强[1] 张春生[1] ZHAO Meili;SUN Taofeng;GAO Fan;GONG Hongying;ZANG Xiaowei;GUI Qiang;ZHANG Chunsheng(Beijing Glass Research Institute Co.,Ltd.,Beijing 101111,China)

机构地区：[1]北京玻璃研究院有限公司,北京101111

出　　处：《人工晶体学报》2025年第4期553-559,共7页Journal of Synthetic Crystals

基　　金：国家重点研发计划(2022YFB3503603)。

摘　　要：本文采用垂直坩埚下降法,生长出一系列直径3英寸(1英寸=2.54 cm)的掺铈氯铯锂钇(Cs_(2)LiYCl_(6):Ce,简称CLYC:Ce)晶体,LiCl摩尔配比为55%~60%。对晶体毛坯的顶端不透明部分进行X射线衍射测试,结果表明,富Li的组分配比能有效抑制Cs_(3)YCl_(6)相生成。LiCl摩尔配比为57%时得到的晶体中CLYC相的体占比最大,等径完整长度达80 mm。测试了该组分下获得的Ф76 mm×76 mm CLYC:Ce封装晶体的闪烁性能,其对^(137)Cs 662 keVγ射线的能量分辨率达到4.88%,^(241)Am-Be中子源的脉冲波形甄别(PSD)品质因子(FOM)值为4.18,表现出优异的中子-伽马甄别性能。In this paper,a series of 3-inch(1 inch=2.54 cm)diameter Cs_(2)LiYCl_(6):Ce(CLYC∶Ce)crystals with LiCl molar ratios of 55%~60%were grown by vertical Bridgman method.XRD patterns of opaque initial end of the crystals show that the Li-rich group distribution ratio can effectively inhibit the generation of the Cs_(3)YCl_(6)phase.The optimal molar ratio of LiCl for high quality CLYC is 57%,where the volume ratio of CLYC phase to the total ingot is the largest,and isometric complete length up to 80 mm.Scintillation properties such as relative light output,energy resolution and figure of merit(FOM)ofФ76 mm×76 mm CLYC:Ce crystal obtained under the optimal proportioning condition were tested.The results show that 4.88%energy resolution is measured at 662 keV of^(137)Csγrays.The figure of merit(FOM)of pulse shape discrimination(PSD)measured with a^(241)Am-Be neutron source is 4.18.The study indicates that CLYC:Ce crystal has excellent neutron-gamma discrimination performance.

关 键 词：Cs_(2)LiYCl_(6):Ce晶体 坩埚下降法 能量分辨率 脉冲波形甄别 品质因子 

分 类 号：O782[理学—晶体学]