摘要
由闪烁体和光电转换器件构成的闪烁体探测器是工业CT系统中最常用的探测器,其中闪烁体负责将X射线转换为可见光信号,再经过光电转换器件转换为电信号进行探测.闪烁体作为探测器的一部分,其厚度直接影响发光效率和探测分辨性能.本文基于蒙特卡罗仿真平台Geant4建立仿真模型,对碘化铯Cs I(Tl)闪烁体在不同厚度、不同X射线能量(20~80 ke V)下的特性进行模拟,分析闪烁体厚度对闪烁体转换效率以及分辨力的影响.通过仿真获了特定输入能量下对应的闪烁体的理想厚度值.仿真结果可以为闪烁体参数设计和优化提供参考.
Scintillator and opto-electronic conversion device coupled X-ray detector is widely used in industry CT system. The scintillator of X-ray detector converts X-ray into visible light. The scintillator as a major part of detector affects the imaging efficiency and resolution of the detector. Based on the Geant4 simulation platform,the Monte Carlo model was built to simulate the characteristics of Cs I（ Tl） scintillator under different scintillator thicknesses and different X-ray energy（ 20—80 ke V）. Furthermore,the effects of scintillator conversion efficiency and resolution with different scintillator thicknesses were calculated.Simulation results show the ideal thickness of the scintillator for the given input energy. The simulation results provide a reference for the parameter design and optimization of the scintillator.
出处
《纳米技术与精密工程》
CSCD
北大核心
2017年第6期444-448,共5页
Nanotechnology and Precision Engineering
基金
国家自然科学基金资助项目(61372144)
国家重大科学仪器设备开发专项资助项目(2011YQ030112)
