α放射性表面污染位置灵敏探测器模拟设计  

Simulating Study of Position Sensitive Detector forαRadioactive Surface Contamination

作　　者：文继 肖海玲 王亮[1] 张宏俊[1] 詹冠森 刘俊豪 熊忠华[1] WEN Ji;XIAO Hailing;WANG Liang;ZHANG Hongjun;ZHAN Guansen;LIU Junhao;XIONG Zhonghua(China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国工程物理研究院,绵阳621900

出　　处：《核电子学与探测技术》2023年第3期569-577,共9页Nuclear Electronics & Detection Technology

摘　　要：为解决计数型表面污染仪无法给出污染分布的问题,设计了基于闪烁体和硅光电倍增管的α位置灵敏探测器。利用GEANT4模拟了α粒子在探测器中输运与发光全过程,并根据光子的分布重建α粒子的位置。模拟结果表明,采用0.1 mm厚的GAGG闪烁体与1 mm有机玻璃光导耦合的探测器,模拟结果的最高分辨率可达0.1 mm;使用GAGG闪烁体搭建的α位置灵敏探测器分辨率可达0.8 mm,ZnS闪烁体分辨率可达0.4 mm;设计的α位置灵敏探测器具有较高的位置分辨性能,可满足表面污染分布测量的需求。In order to solve the problem that the traditional surface contamination monitor can not measure the contamination distribution,aαposition sensitive detector based on scintillator and SiPM was designed.Theαparticle transport and luminescence process in the detector by GETANT4 was simulated,and the position by using the center of gravity method through the photon position distribution was reconstructed.The simulation results show that the spatial resolution is affected by the light yield and thickness of scintillator,the thickness of light guide,as well as the pixel size and quantum efficiency of SiPM array.In the simulation experiment,using 0.1 mm thick GAGG scintillator coupling with 1 mm PMMA light guide,a 0.1 mm wide slit can be resolved.The experimental measurement shows that the resolution of the position sensitive detector developed by using GAGG scintillator can reach 0.8 mm,and the resolution of ZnS scintillator can reach 0.4 mm,it is proved that the designedαposition sensitive detector has high position resolution for measuring surface contamination distribution.

关 键 词：α放射性表面污染 MC模拟 GEANT4 位置灵敏探测器 

分 类 号：TL503.6[核科学技术—核技术及应用]