深空环境中铁离子剂量场研究

Iron Properties in the Galactic Cosmic Ray:Dosimetric Study

银河系宇宙射线是深空辐射环境的重要组成部分,在长时间的深空探测中,银河系宇宙射线对宇航员的积累损伤不可忽视。对深空环境下银河系宇宙射线进行了研究,并重点讨论了银河系宇宙射线中Fe离子的剂量场性质。以CREME模型为基础计算得到Fe离子注量谱,对深空环境中的Fe离子的剂量学性质进行细致研究,分析研究了Fe离子的原初粒子造成的剂量场,及经过屏蔽后其碎片及次级中子对内部辐射场造成的影响及对剂量的贡献,并对结果进行了分析,得到的结果对载人航天具有重要意义。

Galactic cosmic ray is an important part of deep space radiation environment. It can not be neglected in deep space missions because of its accumulative dose to astronauts. This paper firstly described the deep space radiation environment, then discussed iron in Galactic Cosmic Ray in detail. CREME model is used to calculate the iron flux spectrum and linear energy transfer. Based on the results of calculation above, Geant4 toolkit was used to simulating iron interaction with materials to study the dosimetry of projectile ion and nuclear fragments. The results from simulation are signality to deep space exploration.