摘要
深空环境下高能银河宇宙射线与防护材料间产生了复杂多样的次级粒子,使得航天员辐射损伤效应和防护问题突出。运用Geant4蒙特卡罗仿真工具,计算了1000 MeV·n^(-1)的铁离子与铝或聚乙烯相互作用后,产生次级碎片粒子分布规律;分析了银河宇宙射线经过不同材料屏蔽体后,其碎片及次级中子对人体剂量当量的贡献随屏蔽厚度变化规律;依据该规律优化设计质量密度为20 g/cm^2聚乙烯掺杂比为15%硼的复合材料,得到的仿真设计复合材料成分比例可为载人航天被动屏蔽材料制备提供依据。
Complex nuclear reactions will occur between the high-energy galactic cosmic rays andthe protective materials in deep space environment and a large number of secondary particles will beproduced which makes the astronaut dose protection very complex. Based on the Monte-Carlo simu-lation software Geant4, the distribution law of the secondary debris particles generated after the in-teraction between 1000 MeV·n ^- 1Fe ion and the shielding material aluminum or polyethylene wasstudied. The changes of the debris and the secondary neutrons with the shielding thickness for thegalactic cosmic ray radiation particles were analyzed. Based on those researches, the composite ma-terial with a mass density of 20 g / cm^2 and polyethylene doped ratio of 15% boron was optimized.The obtained proportion of the simulated composite material may provide the basis for the preparationof passive shielding materials in manned spaceflight.
作者
杨涛
于梅
牛睿
蔡明辉
韩建伟
YANG Tao;YU Mei;NIU Rui;CAI Minghui;HAN Jianwei(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanghai Institute of Spaceflight Control Technology,Shanghai 201109,China)
出处
《载人航天》
CSCD
北大核心
2018年第5期590-595,共6页
Manned Spaceflight
基金
载人航天预先研究项目(Y79001AF00)
