基于MPPC阵列的核辐射成像探测器性能影响因素研究  

Influencing Factors of Performance of Nuclear Radiation Imaging Detector Based on MPPC Array

作　　者：陶祖才 王强 肖雄 宋宝林 张文强 刘双全[4] 黄先超[4] 丁雨憧 徐扬[1,2] TAO Zucai;WANG Qiang;XIAO Xiong;SONG Baolin;ZHANG Wenqiang;LIU Shuangquan;HUANG Xianchao;DING Yuchang;XU Yang(China Electronics Technology Group Corporation,Chongqing 201800,China;China Electronics Technology Group Corporation 26th Research Institute,Chongqing 400060,China;Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中电科芯片技术(集团)有限公司,重庆201800 [2]中国电子科技集团公司第二十六研究所,重庆400060 [3]中国科学院近代物理研究所,兰州730000 [4]中国科学院高能物理研究所,北京100049

出　　处：《人工晶体学报》2025年第1期40-48,共9页Journal of Synthetic Crystals

基　　金：国家重点研发计划(2022YFF0707900,2022YFF0706400);中电科芯片(集团)有限公司发展资金(K2602ZZ2023032)。

摘　　要：本文使用YSO晶体阵列和MPPC阵列组成核辐射成像探测器,探究了基于MPPC阵列的核辐射成像探测器性能关键影响因素,包括前端电阻网络、光导厚度和光导边缘切割深度。首先,前端电子学实验发现,采用均匀电荷分配电路(SCD)可改善图像变形问题并提高信噪比。接着,在SCD基础上研究了不同厚度光导(0、1.0、1.5、2.0、2.5mm)对成像性能的影响,结果显示光导厚度为1.5mm时具有最佳分辨效果,但仍无法区分晶体阵列边缘像素。最后,在1.5mm光导基础上,对光导外围进行不同深度切割并插入增强型镜面反射膜(ESR),实验表明全部切透且加入反射膜时,可以明显区分出边缘晶体单元。This paper employsYSO crystal arrays and MPPC arrays to construct a nuclear radiation imaging detector,investigating the key factors influencing the performance of MPPCarray-based nuclear radiation imaging detectors,including front-end resistance networks,light guide thickness,and light guide edge cutting depth.Initially,through front-end electronics experiments,it is found that using symmetric charge division circuit(SCD)can improve image distortion issues and enhance signal-to-noise ratio.Subsequently,based on SCD,the impact of different thicknesses of light guides(0,1.0,1.5,2.0,2.5 mm)on imaging performance was studied.The results show that a thickness of 1.5 mm provides the best resolution.However,the edge pixels of the crystal array still cannot be distinguished.Lastly,building upon the 1.5 mm light guide,experiments cutting the light guide periphery to varying depths and inserting enhanced specular reflector(ESR)demonstrats that complete cutting through with the addition of reflective film allows for clear distinction of edge crystal units.

关 键 词：MPPC阵列 YSO晶体阵列 核辐射成像探测器 电子学 前端电阻网络 光导厚度 光导边缘切割深度 

分 类 号：TL812.1[核科学技术—核技术及应用]