【作者】 王新； 王风丽； 方恺； 徐捷； 穆宝忠；

【Author】 WANG Xin;WANG Fengli;FANG Kai;XU Jie;MU Baozhong;School of Physics Science and Engineering,Tongji University;

【机构】 同济大学物理科学与工程学院；

【摘要】 闪烁体探测器是X射线康普顿散射成像系统的核心部件,探测效率决定了系统检测的灵敏度和图像对比度。利用Geant4程序构建了康普顿散射及探测的仿真模型,研究了X射线散射信号在闪烁体探测器中的能量沉积,研究了探测器材料、尺寸及X射线能量对探测信号强度的影响。仿真结果表明高原子序数物质构成的硅酸镥(LSO)的探测效率明显优于低原子序数聚苯乙烯,沉积粒子数随着探测器厚度的增大而增加。仿真为高灵敏度X射线探测提供了一种有效的设计方法,对于小型化背散射系统的研制及科研、教学用新型X射线探测器的开发具有重要的意义。更多还原

【Abstract】 The scintillator detector is a key component of X-ray Compton scattering imaging system.Detection efficiency determines sensitivity and image contrast of system.A simulation model of Compton scattering and detection was constructed based on Geant4 program.The deposition of scattered X-ray in scintillator and the influences of material,size and X-ray energy on the signal intensity were studied.The results show that the detection efficiency of LSO composed of high atomic number materials is obviously better than that of low atomic number polystyrene,and the number of deposited particles increase with thickening of detector.The simulation provides an effective design method for high sensitivity X-ray detection,which is of great significance for the development of miniaturized backscatter system and novel X-ray detectors in scientific research and teaching.更多还原