掺铈Cs_(2)BaBr_(4)晶体的生长和闪烁性能研究  

Growth and Scintillation Properties of Cerium-Doped Cs_(2)BaBr_(4)Crystal

作　　者：殷洁 张小强[2] 陈灿 潘建国 YIN Jie;ZHANG Xiaoqiang;CHEN Can;PAN Jianguo(Hunan Chemical Vocational Technical College,Zhuzhou 412000,China;Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province,School of Materials Science and Chemical Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]湖南化工职业技术学院,株洲412000 [2]宁波大学材料科学与化学工程学院,浙江省光电探测材料及器件重点实验室,宁波315211

出　　处：《人工晶体学报》2024年第5期760-765,共6页Journal of Synthetic Crystals

基　　金：2021年湖南省教育厅科学研究资助项目(21C1116)。

摘　　要：以高纯度BaBr_(2)、CsBr、CeBr_(3)为原料,采用高温固相反应法合成了Cs_(2)BaBr_(4)∶1%Ce^(3+)多晶料,并通过坩埚下降法生长了Cs_(2)BaBr_(4)∶1%Ce^(3+)晶体。将晶体切割研磨抛光后得到不同厚度的Cs_(2)BaBr_(4)∶1%Ce^(3+)晶片。对晶体进行了物相分析,XRD图谱表明晶体为一致熔融物,且无相变。研究了晶体的闪烁性能,测试了光学透射率、光致发光、X射线激发发光、多通道gamma能谱、衰减时间。与LaBr_(3)晶体对比,分析了晶体的吸湿性。结果表明,晶体的光学透过率接近80%,在一定波段的紫外光及X射线的激发下,晶体在349与372 nm波长有发射峰。^(137)Cs源伽马射线的激发下,能量分辨率为11%,在紫外激发下,晶体衰减时间为21.9 ns。晶体的吸湿性比LaBr_(3)晶体有大幅改善。Using BaBr_(2),CsBr,and CeBr_(3) with high-purity as raw materials,the Cs_(2)BaBr_(4)∶1%Ce^(3+)polycrystalline powders were synthesized by solid-state reaction method.The crystal of Cs_(2)BaBr_(4)∶1%Ce^(3+)was grown by Bridgman method.The wafer of Cs_(2)BaBr_(4)∶1%Ce^(3+)with different thickness were obtained by incising,grinding and polishing process.The phase of the crystal was analyzed,and XRD patterns show that the crystal is a uniformly molten substance with no phase transition.The scintillation performance of the crystal was studied,which the optical transmittance,photo luminescence,X-ray induced luminescence,multi-channel gamma energy spectrum and decay time were measured.Compared with the crystal of LaBr_(3),the hygroscopicity of the crystal was analyzed.The results show that the optical transmittance of crystal is close to 80%,and under the excitation of ultraviolet light and X-rays in a certain band,the crystal exhibits emission peaks at wavelengths around 349 and 372 nm.The energy resolution under the excitation of gamma rays of^(137)Cs is estimated to be 11%.The decay time under the excitation of UV light is fitted to be 21.9 ns.The hygroscopicity of the crystal is much better than that of LaBr_(3) crystal.

关 键 词：Cs_(2)BaBr_(4)∶1%Ce^(3+)晶体 坩埚下降法 光致发光 X射线激发发光 衰减时间 吸湿性 

分 类 号：O78[理学—晶体学]