^(6)LiI:Eu晶体的制备和闪烁性能研究  

Preparation and Scintillation Properties of ^(6)LiI:Eu Crystal

作　　者：李焕英[1] 郑普[2] 史坚[1] 吴云涛 任国浩[1] Li Huanying;Zheng Pu;Shi Jian;Wu Yuntao;Ren Guohao(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201800,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海201800 [2]中国工程物理研究院核物理与化学所,四川绵阳621900

出　　处：《中国稀土学报》2023年第3期603-609,I0005,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(U2030115)资助。

摘　　要：^(6)LiI:Eu晶体是一种重要的热中子探测闪烁材料,研究了不同掺杂浓度和取样位置对^(6)LiI:Eu晶体光学和闪烁性能的影响。以^(6)LiI(6Li丰度大约95%)和EuI_(2)为原料,在真空气氛下生长制备出Eu^(2+)离子的初始掺杂浓度分别为0.01%,0.02%,0.03%,0.04%和0.05%(摩尔分数)的^(6)LiI:Eu晶体。通过测试室温下的透射光谱、发光光谱、闪烁衰减时间、伽玛射线和中子激发下的脉冲高度谱,研究了^(6)LiI:Eu晶体性能的影响规律。研究发现Eu^(2+)的掺杂浓度从0.01%~0.04%时,^(6)LiI:Eu晶体在中子激发下的能量分辨率先提高后下降;当掺杂浓度为0.03%时,晶体具有最佳的均匀性和中子响应能力。由于掺杂离子的分凝,同一晶体从籽晶端至尾端存在明显的性能不均匀现象。^(6)LiI:Eu crystal is an important scintillation material for thermal neutron detection. Effects of different doping concentrations and sampling positions on the optical and scintillation properties were investigated. ^(6)LiI:Eu crystals with initial doping concentrations of 0.01%, 0.02%, 0.03%, 0.04% and 0.05% Eu^(2+) were prepared under vacuum atmosphere by using ^(6)LiI(^(6)Li abundance of about 95%) and EuI2 as raw materials. The transmission, luminescence, scintillation decay curve, and multichannel pulse height spectrum were studied at room temperature. When doping concentration is from 0.01% to 0.04%, the energy resolution for neutron first increases and then decreases. Crystal doped with 0.03% Eu has the best uniformity and neutron response capacity. Due to the separation of Eu^(2+), the properties are not uniform in the same cryatal from seed to tail.

关 键 词：Eu^(2+)离子 闪烁晶体 LiI(Eu) 中子探测 碘化锂晶体 

分 类 号：O73[理学—晶体学]