不同大气密度条件下近地面γ射线输运的几何相似理论研究  

Similarity Theory of Near-Ground Gamma-Ray Transport Under Different Atmospheric Density

作　　者：朱金辉[1] 李夏至 左应红[1] 牛胜利[1] 商鹏 ZHU Jinhui;LI Xiazhi;ZUO Yinghong;NIU Shengli;SHANG Peng(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,西安710024

出　　处：《现代应用物理》2024年第6期35-41,共7页Modern Applied Physics

基　　金：国家重点研发计划资助项目(2020YFA0709800)。

摘　　要：大气密度是影响γ射线辐射场空间分布的重要因素。为实现不同大气密度条件下核辐射环境场分布的快速计算,在分析无限均匀大气条件下γ射线输运理论基础上,建立了低空近地面大气中γ射线输运几何相似理论模型。模型中考虑了地面介质的反射、大气密度随高度变化等因素。通过蒙特卡罗粒子输运模拟计算,验证了所建立的不同大气密度条件下地面γ射线输运相似理论模型的正确性。研究结果表明,通过建立的不同密度条件下低空γ射线输运相似理论模型,可以实现通过基准大气密度条件下的γ辐射场快速计算任意不同大气密度条件下γ射线辐射场;基于相似理论计算得到的γ辐射场与蒙特卡罗模拟得到的结果之间吻合较好。Atmospheric density is an important factor which can affect the spatial distribution of gamma-ray radiation field.To realize the fast calculation of radiation field distribution under different atmospheric densities,a geometric similarity model of gamma-ray transport in near-ground atmosphere is established based on the analysis of gamma-ray transport theory in infinite uniform atmosphere.In the model,the reflection of ground and the variation of atmospheric density with height are taken into account,and the theoretical model of near-ground gamma ray transport similarity is verified by Monte Carlo particle transport simulation.The results show that the gamma ray radiation field can be rapidly calculated under any different atmospheric densities by establishing a theoretical model of low-altitude gamma-ray transport similarity under different atmospheric densities conditions.

关 键 词：大气密度 γ射线输运 相似理论 快速计算 

分 类 号：TL91[核科学技术—核技术及应用] O571[理学—粒子物理与原子核物理]