LaBr_(3)(Ce)-CsI(Tl)紧凑式叠层反康伽马探测器研制  

Study on Compton-suppressed Phoswich Gamma-ray Detector of LaBr_(3)(Ce)-CsI(Tl)

作　　者：李天晓 吴鸿毅[2] 郑云[1] 李聪博[1] 竺礼华[3] 吴晓光[1] 陆景彬[4] 郑敏 赵子豪 陈若富[5] 魏建德 Tianxiao LI;Hongyi WU;Yun ZHENG;Congbo LI;Lihua ZHU;Xiaoguang WU;Jingbin LU;Min ZHENG;Zihao ZHAO;Ruofu CHEN;Jiande WEI(China Institute of Atomic Energy,Beijing 102413,China;State Key Laboratory of Nuclear Physics and Technology,School of Physics,Peking University,Beijing 100871,China;School of Physics and Nuclear Engineering,Beihang University,Beijing 100191,China;College of Physics,Jilin University,Changchun 130012,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Xiamen centro spark technology LLC,Fuzhou 350002,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]北京大学物理学院,核物理与核技术国家重点实验室,北京100871 [3]北京航空航天大学物理科学与核能工程学院,北京100191 [4]吉林大学物理学院,长春130012 [5]中国科学院近代物理研究所,兰州730000 [6]厦门中烁光电科技有限公司,福州350002

出　　处：《原子核物理评论》2023年第1期73-77,共5页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(U1867210,11975315,U1932209);中国原子能科学研究院院长基金项目(YZ201909);北京大学核物理与核技术国家重点实验室开放课题(NPT2020KFY18);国防基础性科研院所稳定性经费支持项目(WDJC-2019-13,WDJC-2020-25);中核集团领创基金项目(LC192209000701,LC202309000201)。

摘　　要：本工作研制了一套由圆柱形LaBr_(3)(Ce)主晶体和井形CsI(Tl)次晶体组成的叠层伽马探测器,该探测器主要用于鉴别来自LaBr_(3)(Ce)主晶体的康普顿散射光子并进行反符合测量。两种不同的晶体耦合到同一个光电倍增管上。入射辐射沉积在每一层探测器的能量,可以通过PMT给出的信号脉冲形状差异进行识别。利用Geant4模拟结果,验证了脉冲形状甄别性能和康普顿散射抑制效果。利用^(60)Co伽马源对探测器进行了实验测试,测试结果表明,该探测器本底抑制系数为2.33(1),达到了康普顿本底抑制两倍以上的预期目标。In this work,a compact phoswich detector consisting of a cylindrical LaBr_(3)(Ce)principal crystal and a well-shaped CsI(Tl)sub-crystal was designed and assembled to identify and reject Compton scattering in the LaBr_(3)(Ce).Two different crystals coupled to the same photomultiplier tube(PMT).The energy deposition in each layer from incident radiation is then determined via digital pulse shape analysis of the PMT’s pulses.The results of Geant4 simulations were used to verify the performance of the pulse shape identification and the effect of Compton background suppression.Experimental tests were conducted on the detector prototype using a ^(60)Co gamma source,and the result shown that the detector background suppression coefficient was 2.33(1)which achieved the expected purpose of twice as much as the Compton background was suppressed.

关 键 词：紧凑式叠层伽马探测器 LaBr_(3)(Ce) CsI(Tl) 脉冲形状甄别 蒙特卡罗模拟 

分 类 号：TL812[核科学技术—核技术及应用]