基于Geant 4对填充液闪毛细管阵列成像研究  

Geant 4 and imaging of capillary array filled with liquid scintillant

作　　者：王鑫 王曌[1,2,3] 王浩然 刘志国 WANG Xin;WANG Zhao;WANG Haoran;LIU Zhiguo(College of Nuclear Science and Technology,Beijing Normal University,Beijing,100875 China;Key Laboratory of Beam Technology of Ministry of Education,Beijing Normal University,Beijing,100875 China;Beijing Radiation Center,Beijing,100875 China)

机构地区：[1]北京师范大学核科学与技术学院,北京100875 [2]北京师范大学射线束技术教育部重点实验室,北京100875 [3]北京市辐射中心,北京100875

出　　处：《北京师范大学学报（自然科学版）》2020年第4期527-533,共7页Journal of Beijing Normal University(Natural Science)

摘　　要：基于蒙特卡罗方法的模拟程序Geant 4,分析了填充液闪毛细管阵列长度、子管截面形状、阵列层数等关键参数,给出了针对实验室X光源的毛细管阵列最优化设计;还分析了不同射线入射方向、有无吸光体对毛细管阵列成像的影响;开展了X射线对铝片透射成像的模拟实验,结果表明毛细管阵列能应用于微米量级X射线透射成像.Simulation program Geant 4 based on Monte Carlo method was used to analyze key parameters(length,shape and layers)of capillary array filled with liquid scintillant.Optimal design of capillary array for laboratory X-ray tubes was obtained.Influence of incident direction and absorber on capillary array imaging was analyzed.Imaging of parallel incidence of X-ray was found to be better than a conical incidence angle of 60-degree,also absorber must be added between individual capillaries to reduce crosstalk and to improve resolution.Simulation experiment on X-ray transmission imaging of aluminum plate was carried out.Capillary array filled with liquid scintillant was found to be able to obtain aluminum profile information,and obtain thickness information of aluminum plate according to the law of X-ray attenuation.Since the inner diameter of a single capillary can be down to micrometers,this coupled with high-resolution optical detection,capillary array could be applied to X-ray transmission imaging at micrometer scale.

关 键 词：蒙特卡罗模拟 液闪 毛细管阵列 成像 

分 类 号：TL812.2[核科学技术—核技术及应用]