缪子库伦散射成像技术中能量与靶几何结构关系的Geant4模拟研究  

Geant4 Simulation of the Relationship Between Energy and Target Geometry in Muon Coulomb Scattering Imaging

作　　者：贾萱 况鹏[2] 胡毅豪 伍海彪 刘福雁 屈国普[1] 曹兴忠[2,3] 王宝义 魏龙[2,3] JIA Xuan;KUANG Peng;HU Yihao;WU Haibiao;LIU Fuyan;QU Guopu;CAO Xingzhong;WANG Baoyi;WEI Long(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;University of Chinese Academy of Sciences,Beijing 100039,China;The First Affiliated Hospital,Hengyang Medical School,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学核科学技术学院,衡阳421000 [2]中国科学院高能物理研究所,北京100049 [3]中国科学院大学,北京100039 [4]南华大学衡阳医学院第一附属医院,衡阳421001

出　　处：《核电子学与探测技术》2024年第2期231-238,共8页Nuclear Electronics & Detection Technology

基　　金：国家重点研发计划项目(批准号:2019YFA0210000);北京自然科学基金项目(批准号:1222032);国家自然科学基金项目(批准号:U2067206,U1932162,12175261和11475197)。

摘　　要：基于Moliere多重散射理论的缪子散射成像技术,可用于分析材料内部元素分布并确定原子序数。相对于高能量的宇宙射线缪子,加速器打靶产生的缪子束流能量偏低(约为45~450 MeV/c),Moliere多重散射理论的适用性有待探讨。本文利用Geant4软件模拟研究了中、低能量区(<800 MeV)缪子的库仑散射过程,分析了散射角的均方根分布,并通过散射成像算法对模拟结果进行了图像重建。结果表明,中、低能量缪子的散射与成像物体的几何结构密切相关,能量为400 MeV的缪子束流散射成像仅可用于厚度分别小于9.78 mm、56.9 mm、140.7 mm的W、Si、Na材料内部元素的分布信息。研究结果可为Moliere多重散射理论在该能区缪子散射成像技术的应用提供理论指导,推动缪子在核材料检测、文物鉴定、海关安检等领域小尺寸物品的成像分析与应用研究。Muon scattering imaging technique based on Moliere multiple scattering theory can be used to analyze the internal element distribution of the material and determine the atomic number.Compared with the high energy cosmic ray muon,the energy of the muon beam generated by accelerator targeting is low(about 45~450 MeVc-1),and the applicability of Moliere multiple scattering theory needs to be explored.In this paper,we study the Coulomb scattering process in this energy region,analyze the root mean square distribution of the scattering angle,and reconstruct the simulation results through the scattering imaging algorithm.The results show that the scattering of low energy muons is closely related to the size of the imaging object,The 400 MeV muon beam scattering imaging technique can only be used for W,Si and Na materials whose thickness is less than 9.78 mm,56.9 mm and 140.7 mm,respectively,and the distribution information of elements inside the target can be accurately obtained.The research results can guide the application of Moliere multiple scattering theory in muon scattering imaging technology in this energy region,and lay a foundation for the research of muon in small size nuclear material detection,cultural relics imaging and other fields.

关 键 词：库仑散射成像 缪子散射 GEANT4 Moliere理论 元素分布 

分 类 号：TL99[核科学技术—核技术及应用]