基于CZT探测器的γ能谱测量系统  

Design of Energy Spectrum Measurement System Based on CZT Detector

作　　者：孟娜 徐彬[2] 彭敬 李浩炫 高晓燕 王磊[1] MENG Na;XU Bin;PENG Jing;LI Haoxuan;GAO Xiaoyan;WANG Lei(School of Nuclear Technology and Automation Engineering Chengdu University of Technology,Chengdu 610059,China;Sichuan Management&Monitoring Center Station of Radioactive Environment,Chengdu 610000,China)

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]四川省辐射环境管理监测中心站,成都610000

出　　处：《核电子学与探测技术》2023年第5期940-947,共8页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金项目(41874121);四川省苗子工程项目(2021JDRC0068,2021JDRC0107)。

摘　　要：设计了一种基于碲锌镉(CZT)探测器的γ能谱测量系统,并对其进行了测试分析。γ能谱测量系统主要包括信号采集系统、数字多道脉冲幅度分析器以及上位机分析软件。在考虑到CZT探测器与后端电子学电路匹配的前提下,设计了低噪声电荷灵敏前置放大器;立足于低噪声、低功耗以及便捷性,对如何优化设计低噪声高压偏置电源、程控增益电路、ADC采集电路以及FPGA数字信号处理进行了讨论;基于C#上位机软件主要包括能谱平滑、刻度、寻峰以及活度计算等功能;实验测试使用137 Cs放射源进行能谱测量,能量分辨率约为3.26%。结果表明,该γ能谱测量系统是可行的,能够实现一定能量范围内核素识别的功能。A energy spectral measurement system based on cadmium(CdZnTe(CZT))detector was designed and tested.The energy spectral measurement system mainly includes signal acquisition system,digital multi-channel pulse amplitude analyzer and upper computer analysis software.This paper designs the low noise charge-sensitive preamplifier with the back-end electronics circuit.Based on low noise,low power consumption and convenience,this paper discusses how to optimize the design of low noise high voltage offset power supply,programming gain circuit,ADC acquisition circuit and FPGA digital signal processing;The upper computer software based on C#mainly includes energy spectrum smoothing,scale,peak finding and activity calculation;137 Cs were used for energy spectral measurements with an energy resolution of about 3.26%.The results show that the energy spectrum measurement system is feasible and enables the function of nuclide recognition in a certain energy range.

关 键 词：能谱测量系统 碲锌镉 低噪声 能量分辨率 137Cs 

分 类 号：TL82[核科学技术—核技术及应用]