地球内辐射带核心区环境特征分析及质子屏蔽的蒙特卡罗模拟  

Characteristics of radiation environment of core region in inner Van Allen belt and Monte Carlo simulation of proton shielding

作　　者：刘佳强 张振龙 赵班池 刘洋 王慧元 高辉 LIU Jiaqiang;ZHANG Zhenlong;ZHAO Banchi;LIU Yang;WANG Huiyuan;GAO Hui(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101408,China;Innovation Academy for Microsatellites,Chinese Academy of Sciences,Shanghai 201210,China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学天文与空间科学学院,北京101408 [3]中国科学院微小卫星创新研究院,上海201210

出　　处：《航天器环境工程》2022年第4期355-360,共6页Spacecraft Environment Engineering

基　　金：中国科学院国防科技创新重点部署项目(编号:KGFZD-135-20-03-02);北京市科技重大专项(编号:Z191100004319005)。

摘　　要：辐射带粒子是近地空间卫星总剂量辐射的主要来源。文章分析了内辐射带不同高度轨道的辐射环境特性;并利用Geant4程序,针对内辐射带质子环境进行不同材料的屏蔽效能计算。结果表明:虽然传统的低‒高‒低原子序数材料三明治屏蔽结构对电子具有较高的屏蔽效能,却并不适用于以质子环境为主的轨道;对于工作在3000 km圆轨道、5年寿命的卫星,若要将总剂量降至30 krad(Si)以下,使用PE屏蔽材料可比Al屏蔽减重28%。The radiation belt particles are the main source of the total dose radiation for satellites in near-Earth orbits.The characteristics of the radiation environment on different orbits of the inner radiation belt are analyzed,and the shielding capabilities of several materials against the protons of the inner radiation belt are compared by using the Geant4 code.It is shown that although the low-Z/high-Z/low-Z sandwich shielding structure has a better shielding effect for electrons,it is not suitable for the proton-dominated orbits.For satellites operating on the 3000 km circular orbit and with a designed lifetime of five years,the pure PE shielding can be used to reduce the total dose below 30 krad(Si),with the weight reduces by 28%as compared to Al shielding.

关 键 词：空间辐射 内辐射带 质子屏蔽 蒙特卡罗方法 数值模拟 

分 类 号：V520.6[航空宇航科学与技术—人机与环境工程] O242.2[理学—计算数学]