空间重粒子入射屏蔽材料的蒙特卡罗模拟  

Monte Carlo Simulation of Incident Space Heavy Particle into Shielding Materials

作　　者：荀明珠 何承发[1,2] 郑玉展[3] XUN Mingzhu;HE Chengfa;ZHENG Yuzhan(Xinjiang Technical Institute of Physics and Chemistry,Urumqi 830011,China;Xinjiang Key Laboratory of Electronic Information Materials and Devices,Urumqi 830011,China;Beijing Institute of Spacecraft System Engineering,Beijing 100094,China)

机构地区：[1]新疆电子信息材料与器件重点实验室,乌鲁木齐830011 [2]中国科学院新疆理化技术研究所,乌鲁木齐830011 [3]北京空间飞行器总体设计部,北京100094

出　　处：《载人航天》2019年第2期159-163,共5页Manned Spaceflight

基　　金：国家自然科学基金(11765022);载人航天预先研究项目(010501)

摘　　要：针对空间辐射环境中银河宇宙射线重离子的屏蔽防护问题,使用基于蒙特卡罗方法的Geant4软件模拟330 MeV/n ^(12)C粒子入射铝、聚乙烯、水、液态氢4种屏蔽材料,分析了^(12)C粒子在4种屏蔽材料内的深度剂量分布;在Geant4中建立MIRD人体模型,分析了^(12)C粒子入射4种屏蔽材料后在人体睾丸器官内的吸收剂量;对每种次级粒子在器官内的吸收剂量进行比对,分析了^(12)C粒子入射PE材料产生的次级质子和次级中子能谱。结果表明:330 MeV/n ^(12)C粒子在液态氢中的入射深度为9.66 g/cm^2,在Al中的入射深度为液态氢中入射深度的2.63倍,^(12)C粒子入射5 g/cm^2Al屏蔽材料后在器官内的吸收剂量为2.98×10^(-14 ) Gy/Ion,在液态氢屏蔽后器官内的吸收剂量为2.29×10^(-14 ) Gy/Ion,与Al屏蔽相比吸收剂量降低23.2%。To study the shielding problem of the heavy ions in space Galactic Cosmic Ray radiation,Geant4 software based on Monte Carlo method was used to simulate the 330 MeV/n 12 C incident particles into four kinds of shielding materials including Al,PE,water and liquid hydrogen.The depth dose distribution of 12 C particles in four kinds of shielding materials were analyzed.The MIRD human body model was established in Geant4,and the equivalent human testis dose were analyzed when 12 C incident particle into four kinds of shielding materials.The secondary protons and secondary neutron spectra produced by the 12 C particles were analyzed in PE material.The results showed that the areal density of 330 MeV/n 12 C particles in liquid hydrogen was 9.66 g/cm^2,the areal density in Al was 2.63 times longer.The equivalent dose of testis organ was 2.98×10^-14 Gy/Ion with 5 g/cm^2 Al shielding,and 2.29×10^-14 Gy/Ion with liquid hydrogen shielding,which was 23.2%lower as compared with the Al shielding.

关 键 词：GEANT4 屏蔽材料 MIRD 人体模型 深度剂量分布 

分 类 号：TL99[核科学技术—核技术及应用]