【摘要】：針對空間高能電子環(huán)境可能造成的航天設(shè)備故障、宇航員輻照損傷等情況,基于電子束返回效應(yīng),提出了一種磁場下金屬/真空夾層式高能電子屏蔽結(jié)構(gòu)。采用Geant4軟件,模擬空間高能電子連續(xù)能譜,研究磁場下夾層式結(jié)構(gòu)的高能電子屏蔽性能。此外,建立體素模型,計(jì)算射線在人體中的累積劑量,從而評估磁感應(yīng)強(qiáng)度、屏蔽體材料對屏蔽性能的影響。結(jié)果表明:與傳統(tǒng)被動屏蔽方式相比,夾層式結(jié)構(gòu)具有電子屏蔽性能高、生成透射次級X射線少的特點(diǎn);隨著磁感應(yīng)強(qiáng)度增加,體模中累積劑量下降,證明夾層結(jié)構(gòu)的電子屏蔽性能不斷提升;Ti/Ti材料組合的屏蔽方式具有更優(yōu)越的高能電子屏蔽性能。該結(jié)構(gòu)具備較好的高能電子屏蔽性能,將來有望對空間高能電子輻射環(huán)境進(jìn)行有效防護(hù)。
[Abstract]:Based on the electron beam return effect, a metal / vacuum sandwich structure for high energy electron shielding under magnetic field is proposed for the possible failure of space equipment caused by high energy electron environment in space and the radiation damage of astronauts. The high energy electron shielding performance of sandwich structure under magnetic field is studied by using Geant4 software to simulate the continuous energy spectrum of high energy electrons in space. In addition, a stereoelement model is built to calculate the cumulative dose of radiation in human body, and then to evaluate the magnetic induction intensity and the effect of shielding material on shielding performance. The results show that, compared with the traditional passive shielding method, the sandwich structure has the characteristics of high electronic shielding performance and less transmission of secondary X-rays. With the increase of magnetic induction intensity, the cumulative dose in the bulk mode decreases, which proves that the electronic shielding performance of sandwich structure is continuously improved, and the shielding mode of Ti/Ti material combination has more superior high energy electron shielding performance. The structure has good high energy electron shielding performance, and it is expected to effectively protect the environment of high energy electron radiation in space in the future.
【作者單位】： 南京航空航天大學(xué)核科學(xué)與工程系;江蘇省核能裝備材料工程實(shí)驗(yàn)室;
【基金】：南京航空航天大學(xué)研究生創(chuàng)新基地開放基金(kfjj20160608,kfjj20170609) 江蘇省優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目
【分類號】：TL752
，

本文編號：2387477