CZT面元像素探测器的研制及其幅度修正技术的实现  

Establishment of CZT pixellated radiation detection system and realization of its amplitude correction

作　　者：黎淼[1] 肖沙里[1] 王玺[1] 陈宇晓[2] 曹玉琳[2] 聂玲[1] 张流强[1] 

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400030 [2]中国工程物理研究院电子工程研究所,四川绵阳621900

出　　处：《光电子．激光》2011年第9期1277-1282,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金委员会-中国工程物理研究院联合基金资助项目(10876044);中央高校基本科研业务费资助项目(CDJXS11122219)

摘　　要：根据CdZnTe(CZT)面元像素探测器基本原理,测试分析了像素阵列CZT晶体漏电流特性。建立了基于数字脉冲处理方式的11 mm×11 mm×3 mm尺寸4×4像素阵列CZT探测系统。采用137Cs 662 keV伽玛源测试得到探测系统响应脉冲幅度谱,平均能量分辨率为3.3%,全能谱峰(FWHM)为21.85 keV。采用数字脉冲幅度修正方法实现了对探测器像素单元信号处理方式的改进,角像素能量分辨率平均提高1.6%,像素单元最优能量分辨率为2.5%。实验结果表明,所搭建的4×4面元像素阵列探测系统具有高能量分辨率,幅度修正方法对边缘像素能谱性能有明显改进。Based on the principle of CdZnTe（CZT） pixel array detector,the leakage current characteristic of CZT pixellated crystal is tested and analyzed simultaneously.We fabricated 11 mm×11 mm×3 mm and 4×4 pixel array CZT detector system through the digital pulse processing method.The pulse amplitude spectrum of the CZT detector has been measured for 137Cs 662 keV Gamma source.The average energy resolution of the pixellated detector system is 3.3% and full energy peak FWHM is 21.85 keV.For improving spectroscopy response,the digital pulse corrected method is applied.The average energy resolution of corner pixels has been improved by 1.6%,and the best energy resolution of pixels is 2.5%.The experimental results indicate that the energy resolution of the 4×4 pixellated CZT detector system is excellent.The influence of edge pixel effect is substantially reduced,and the resolution of edge pixels is improved efficiently.

关 键 词：CdZnTe(CZT) 半导体探测器 像素阵列 幅度修正 能量分辨率 

分 类 号：TL814[核科学技术—核技术及应用]