Cs4SrI6∶Eu晶体的生长和闪烁性能研究  

Growth and Scintillation Properties of Cs4SrI6∶Eu Crystal

作　　者：张迪 魏钦华[1] 林佳 秦来顺[1] 唐高[1] 史宏声[1] ZHANG Di;WEI Qinhua;LIN Jia;QIN Laishun;TANG Gao;SHI Hongsheng(College of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China)

机构地区：[1]中国计量大学材料与化学学院,杭州310018

出　　处：《人工晶体学报》2020年第5期774-779,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(11975220,51972291,11575170,11605194)。

摘　　要：采用垂直布里奇曼法成功生长了一种Cs4SrI6∶3%Eu闪烁晶体。毛坯晶体尺寸最大为Φ25×70 mm3,是目前最大的Cs4SrI6∶Eu单晶。XRD结果表明,晶体具有K4-CdCl6晶体结构,属于R-3C空间群,通过紫外-可见荧光光谱和X射线激发发射光谱,研究了晶体的荧光性能。研究了在137Cs 662 keV辐射下Cs4SrI6∶Eu单晶的闪烁性能和衰减时间,表明该晶体具有较高的光输出和优良的能量分辨率,衰减时间约为1.86μs。通过分析Eu^2+在晶体中不同部位的浓度,计算出Cs4SrI6∶Eu晶体中Eu^2+的分凝系数约为1.136,结果表明Cs4SrI6∶Eu晶体在辐射探测中具有潜在的应用前景。Cs4SrI6∶3%Eu scintillation crystal was successfully grown by vertical Bridgman method.The rough crystal size reaches up toΦ25×70 mm3,it is the largest Cs4SrI6∶Eu single crystal to date.XRD results show that the crystal has a K4-CdCl6 crystal structure and belongs to the R-3C space group.The fluorescence properties of the crystal were studied by the ultraviolet-visible fluorescence spectrum and X-ray excitation emission spectrum.The scintillation performance and decay time of Cs4SrI6∶Eu single crystal under 137Cs 662 keV radiation were studied.The results show that the crystal has a high light output and excellent energy resolution,decay time is about 1.86μs.By analyzing the concentration of Eu^2+in different parts of the crystal,calculate the segregation coefficient of Eu^2+in Cs4SrI6∶Eu crystal is 1.136.The results show that Cs4SrI6∶Eu crystal has potential application prospects in radiation detection.

关 键 词：Cs4SrI6∶Eu晶体 布里奇曼法 闪烁材料 分凝系数 自吸收 

分 类 号：O78[理学—晶体学]