磁场下夹层结构的高能电子屏蔽性能

Shielding ability of sandwich configuration for high-energy electrons in magnetic field

针对空间高能电子环境可能造成的航天设备故障、宇航员辐照损伤等情况,基于电子束返回效应,提出了一种磁场下金属/真空夹层式高能电子屏蔽结构。采用Geant4软件,模拟空间高能电子连续能谱,研究磁场下夹层式结构的高能电子屏蔽性能。此外,建立体素模型,计算射线在人体中的累积剂量,从而评估磁感应强度、屏蔽体材料对屏蔽性能的影响。结果表明:与传统被动屏蔽方式相比,夹层式结构具有电子屏蔽性能高、生成透射次级X射线少的特点;随着磁感应强度增加,体模中累积剂量下降,证明夹层结构的电子屏蔽性能不断提升;Ti/Ti材料组合的屏蔽方式具有更优越的高能电子屏蔽性能。该结构具备较好的高能电子屏蔽性能,将来有望对空间高能电子辐射环境进行有效防护。

Given the aerospace equipment failure and radiation damage of astronauts caused by spatial high-energy electron,a metal/vacuum sandwich configuration was proposed based on electron return effects induced by magnetic field.The continuous energy spectrum of spatial high-energy electron was simulated and shielding ability of sandwich configuration in magnetic field was investigated by using the Monte Carlo method.Moreover,the influences of magnetic flux density and layer of metal on the shielding property of sandwich systems were investigated by using a female Chinese hybrid reference phantom based on cumulative dose.Results show that the sandwich systems presented have improved shielding ability to electrons and less secondary X-ray transmissions than the conventional systems.The cumulative dose decreased and shielding ability increased with increasing magnetic flux intensity.The Ti/Ti sandwich configuration exhibited superior high-energy shielding performance.Due to its effective high-energy electron shielding ability,this type of shielding system might be used for further space radiation protection in a highenergy electron environment.