高能工业CT探测器能谱响应影响校正研究  

Research on Influence of Energy Spectrum Response of ICT Detector Arrays

作　　者：周日峰[1] 高富强[1] 张平[1] 

机构地区：[1]重庆大学ICT研究中心,重庆400044

出　　处：《原子能科学技术》2008年第1期83-86,共4页Atomic Energy Science and Technology

基　　金：重庆自然科学基金重点资助项目(CSTC2005BA2002)

摘　　要：高能X射线工业CT探测器系统的能谱响应是一重要的特性参数。用实验方法测定探测器的能谱响应曲线存在很多困难。本工作利用Monte-Carlo模拟程序计算了CdWO4探测器模块的能谱响应曲线,分析了9 MeV驻波电子直线加速器X射线束的能量、剂量角分布以及X射线束能谱硬化对探测器模块探测效率的影响,为线阵探测器系统的一致性校正、非线性校正等提供了理论计算参数,并应用于工业CT图像校正,取得了满意的效果。The energy spectrum response is important characteristic for X-ray ICT detector.But there exist many difficulties to measure these parameters by experiments.The energy spectrum response of CdWO4 detector was simulated by using the EGSnrc code.Meanwhile the effect of detection efficiency was analyzed by the distribution of accelerator bremsstrahlung spectra and the X-ray spectrum hardening,and some theoretic parameters were offered for the consistent and no-linearity correction of detector arrays.It was applied to ICT image correction,and a satisfying result was obtained.

关 键 词：探测效率 能谱响应 不一致性 MONTE-CARLO模拟 

分 类 号：TL81[核科学技术—核技术及应用]