临近空间大气中子环境的仿真研究

以大气模型、宇宙线模型和地磁截止刚度模型为基础，利用蒙特卡罗方法在国内首次建立了临近空间大气中子环境的计算机仿真模型，分别研究了银河宇宙线、太阳宇宙线诱发的大气中子环境分布规律以及地磁场屏蔽作用对大气中子环境的影响.通过与国外相关模型对比，证明本仿真模型是准确、可靠的，对太阳质子事件的详细分析，弥补了国外已有模型中的不足.该模型可用于临近空间大气中子诱发的元器件单粒子效应评估，以及航空机组人员飞行期间所接受的辐射剂量分析. 关键词： 临近空间 大气中子 单粒子效应 蒙特卡罗

A simulation study of the atmospheric neutron environment in near space

In this paper, a Monte Carlo simulation model based on atmosphere model, cosmic ray model and geomagnetic field model has been developed for the near space atmospheric neutron environment. The neutron distributions induced by cosmic rays and solar particles have been calculated separately. What is more, the influence of cutoff rigidity to neutron flux has been analyzed. By comparing with ARM model, we can draw the conclusion that our model is credible and excellence in calculating neutron flux induced by solar particles. The model could be applied in many fields, such as evaluating single event effects of microelectronics and analyzing radiation dose received by the air crew.