高光产额SrI_(2)Eu^(2+)晶体制备及其闪烁性能研究  

Growth and Scintillation Properties of SrI_(2)Eu^(2+) Crystal With High Light Yield

作　　者：金鹏 张春生[3] 欧阳晓平[1,2] 刘金良 陈亮[1,2] 何世熠 阮金陆[1,2] 孙涛峰 王方宝[1,2] 刘林月 张显鹏 张建福 JIN Peng;ZHANG Chunsheng;OUYANG Xiaoping;LIU Jinliang;CHEN Liang;HE Shiyi;RUAN Jinlu;SUN Taofeng;WANG Fangbao;LIU Linyue;ZHANG Xianpeng;ZHANG Jianfu(National Key Laboratory of Intense Pulsed Radiation Simulation and Effect;Northwest Institute of Nuclear Technology:Xi’an 710024,China;Beijing Glass Research Institute,Beijing 101111,China)

机构地区：[1]强脉冲辐射环境模拟与效应全国重点实验室 [2]西北核技术研究所,西安710024 [3]北京玻璃研究院,北京101111

出　　处：《现代应用物理》2024年第1期28-33,共6页Modern Applied Physics

基　　金：国家自然科学基金资助项目(12105230)。

摘　　要：SrI_(2)Eu^(2+)晶体因其极高的光产额和优良的能量分辨率,在伽马射线高分辨测量中呈现出良好的应用前景。采用改进的坩埚下降法制备出掺杂浓度为5.0%的SrI_(2)Eu^(2+)晶体,加工制成了直径为25 mm,厚度分别为3,6,9,12 mm的单透光防潮封装SrI_(2)Eu^(2+)闪烁体。研究了4种不同尺寸闪烁体对^(241)Am,^(137)Cs,^(60)Co放射源伽马射线的响应,测试了SrI_(2):Eu^(2+)晶体的荧光光谱、能量分辨率、发光产额及衰减时间等闪烁性能。实验结果表明:SrI_(2)Eu^(2+)晶体的发光光谱峰值位于436 nm,SrI_(2)Eu^(2+)晶体闪烁性能随晶体厚度减薄或伽马射线能量的提高而提升。3 mm厚度SrI_(2)Eu^(2+)闪烁体对1.173 MeV^(60)Co伽马射线的能量分辨率达到了2.74%,在^(137)Cs源伽马射线激发下,光产额达到1.23×10^(5)MeV^(-1),是传统NaI:Tl闪烁体光产额的3倍以上,与当前国际上报道的最好的实验结果相当。Due to its high light yield and good resolution,SrI_(2)Eu^(2+)crystal shows great application potential in high resolution gamma ray measurement.In this paper,SrI_(2)Eu^(2+)crystal with 5.0%doping concentration is grown by the improved vertical Bridgman method.The crystal is cut,polished and enveloped with single-side light-transparent and moisture-proof package.Four SrI_(2)Eu^(2+)crystals with a diameter of 25 mm,thickness of 3,6,9,12 mm are fabricated,respectively.The response of SrI_(2)Eu^(2+)to ^(241)Am,^(137)Cs and ^(60)Co gamma ray radiation are studied experimentally.The scintillation properties,such as radioluminescence spectrum,energy resolution,light yield,and decay time are measured.The results show that the peak of radioluminescence spectrum is at 436 nm.The SrI_(2)Eu^(2+)scintillation properties are improved with the decrease of crystal thickness or the increase of gamma ray energy,while the optimum energy resolution is 2.74%for a 3 mm thick SrI_(2)Eu^(2+)irradiated by ^(60)Co 1.173 MeV gamma ray.The measured light yield of SrI_(2)Eu^(2+)with a thickness of 3 mm is about 1.23×10^(5) MeV^(-1),which is three times more that of traditional NaI:Tl scintillator under the excitation of ^(137)Cs irradiation,

关 键 词：SrI_(2)Eu^(2+)晶体 坩埚下降法 脉冲幅度谱 发光产额 能量分辨率 

分 类 号：TL812[核科学技术—核技术及应用] O571[理学—粒子物理与原子核物理]