基质组分配比对Cs_(2)LiYCl_(6)∶Ce晶体生长及闪烁性能的影响  

Effect of Matrix Composition Ratio on the Growth and Scintillation Properties of Cs_(2)LiYCl_(6)∶Ce Crystal

作　　者：王绍涵 吴云涛 李焕英[1] 史坚[1] 任国浩[1] WANG Shaohan;WU Yuntao;LI Huanying;SHI Jian;REN Guohao(Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《人工晶体学报》2021年第10期1925-1932,共8页Journal of Synthetic Crystals

基　　金：自然科学基金NSAF项目(U2030115)。

摘　　要：Cs_(2)LiYCl_(6)∶Ce(CLYC∶Ce)是一种具有良好能量分辨率、高光输出,以及优秀的中子/伽马分辨能力的新型闪烁晶体,但因其组分复杂,晶体生长很困难。本文使用坩埚下降法分别生长了LiCl占57%、60%和63%(摩尔分数)及CsCl与YCl_(3)比例为1.9∶1和2.1∶1共5种不同组分配比的CLYC晶体,发现LiCl占比为60%的组分得到的CLYC相体积占比最大,而改变CsCl与YCl3的比例对晶体生长没有明显的积极作用。5 mm×5 mm×5 mm和φ25 mm×10 mm样品在137Cs激发下的能量分辨率分别为4.8%和5.6%。CLYC晶体在662 keV伽马射线激发下的闪烁衰减时间为17 ns、436 ns和3603 ns。Cs_(2)LiYCl_(6)∶Ce(CLYC∶Ce)is a new type of scintillation crystal with good energy resolution,high light output and excellent neutron/gamma discrimination ability.However,its complex composition results in many difficulties for crystal growth.In this paper,five different CLYC crystals with different composition ratios of LiCl accounted for 57%,60%and 63%(mole fraction)and CsCl to YCl_(3) ratios of 1.9∶1 and 2.1∶1 were grown using the vertical Bridgman method.It is found that optimal proportion for high quality CLYC is 60%LiCl,where the volume ratio of transparent CLYC phase to the total ingot is the largest.Changing the ratio of CsCl to YCl_(3) has no obvious positive effect on crystal growth.The energy resolution of 5 mm×5 mm×5 mm and Φ25 mm×10 mm samples excited by ^(137)Cs is 4.8%and 5.6%,respectively.The scintillation decay time of CLYC crystal under 662 keV gamma-ray excitation is 17 ns,436 ns and 3603 ns.

关 键 词：Cs_(2)LiYCl_(6)∶Ce 稀土卤化物 闪烁晶体 坩埚下降法 晶体生长 闪烁性能 

分 类 号：O734[理学—晶体学]