平面型CdZnTe探测器电荷收集效率对能谱测量的影响

doi:10.3969/j.issn.1007-2861.2016.01.004

上海大学学报(自然科学版) ›› 2016, Vol. 22 ›› Issue (2): 231-237.doi: 10.3969/j.issn.1007-2861.2016.01.004

平面型CdZnTe探测器电荷收集效率对能谱测量的影响

李杨1, 罗文芸1, 贾晓斌1, 张家磊1, 王林军2

1. 上海大学环境与化学工程学院, 上海200444; 2. 上海大学材料科学与工程学院, 上海200072

收稿日期:2016-01-16 出版日期:2016-04-30 发布日期:2016-04-30
通讯作者: 罗文芸(1965—), 女, 副研究员, 博士, 研究方向为辐射物理．E-mail: wyluo@shu.edu.cn
作者简介:罗文芸(1965—), 女, 副研究员, 博士, 研究方向为辐射物理．E-mail: wyluo@shu.edu.cn
基金资助:
国家自然科学基金资助项目(11375112, 11575108)

Influence of charge collection efficiency on energy spectrum for planar CdZnTe detector

LI Yang1, LUO Wenyun1, JIA Xiaobin1, ZHANG Jialei1, WANG Linjun2

1. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China;
2. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China

Received:2016-01-16 Online:2016-04-30 Published:2016-04-30

摘要/Abstract

摘要：

采用蒙特卡洛程序Geant4构建平面型CdZnTe探测器, 模拟²⁴¹Am(59.5 keV)与¹³⁷Cs(662 keV)两种不同能量射线从阴极面垂直入射探测器. 通过在Geant4 中添加Hecht 方程来计算探测器不同位置处的电荷收集效率. 根据模拟输出的能谱, 结合能量沉积分布、电子-空穴对分布及其相互作用类型, 在考虑电荷收集效率的情况下, 研究了探测器能谱测量的变化.结果发现, 在考虑电荷收集效率后, 能谱向低能部分偏移, 偏移程度与最大电荷收集效率紧密相关.

关键词: CdZnTe探测器 , 电荷收集效率 , 电子-空穴对 , 能谱, Geant4

Abstract:

Using Monte-Carlo code Geant4 to model the planar CdZnTe detector, the incidences of two different energy ray ²⁴¹Am (59.5 keV) and ¹³⁷Cs (662 keV) to the planar CdZnTe detector from the cathode surface perpendicularly were simulated. The charge collection efficiency was calculated by adding the Hecht equation in Geant4. Combined with distributions of the deposited energy, electron-hole pairs and the interaction types, the influence of charge collection efficiency on the energy spectrum was discussed. The results showed that the energy spectrum shifted to the low energy side after considering the charge collection efficiency. The shift was closely connected to the maximum charge collection efficiency.

Key words: energy spectrum, CdZnTe detector , charge collection efficiency , electron-hole pairs , Geant4

李杨1, 罗文芸1, 贾晓斌1, 张家磊1, 王林军2. 平面型CdZnTe探测器电荷收集效率对能谱测量的影响[J]. 上海大学学报(自然科学版), 2016, 22(2): 231-237.

LI Yang1, LUO Wenyun1, JIA Xiaobin1, ZHANG Jialei1, WANG Linjun2. Influence of charge collection efficiency on energy spectrum for planar CdZnTe detector[J]. Journal of Shanghai University（Natural Science Edition）, 2016, 22(2): 231-237.

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平面型CdZnTe探测器电荷收集效率对能谱测量的影响

Influence of charge collection efficiency on energy spectrum for planar CdZnTe detector

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