用于康普顿相机的成像探测系统研制

Development of detection system for compton camera

目的针对核设施热点成像应用设计康普顿相机的探测器和读出电子学系统。方法采用两块像素型碲锌镉探测器分别作为康普顿相机的散射层和吸收层,利用SRE4002模块、信号处理电路、模数转换电路和主控板等构成读出电子学系统,并针对康普顿相机应用设计了数据采集逻辑和控制程序,可对探测器每个像素的能量响应进行实际校准测试。结果测试发现该探测系统的位置分辨与像素设计一致;校准后662 keV处总能量分辨和平均能量分辨约为3%。结论该系统的位置分辨和能量分辨符合康普顿相机研究需求,单像素能量校准有效改善了能量分辨,可为康普顿散射成像研究提供硬件支持,并对其他γ成像系统设计具有借鉴意义。

Objective Design detectors and readout system were developed for Compton camera for hot spot imaging applications in nuclear facilities in this work.Methods Two pixel CdZnTe detectors are used as the scattering layer and the absorption layer,respectively.The readout electronics system is composed of SRE4002 module,signal processing circuit,analog-to-digital conversion circuit and Main control board,etc.Data acquisition logic and control program are designed for Compton camera application,which facilitates the calibration of energy responses of all pixels by experiments.Results The space resolution of the system is consistent with the pixel design.The total energy resolution and average energy resolution at 662 keV are about 3%after calibration.Conclusions Both the space resolution and energy resolution of the system meet the requirements of the research of Compton camera.The calibration of the energy of each pixel improves energy resolution effectively.This hardware can provide a support for the imaging research of Compton camera or otherγimaging system.