现代应用物理2025，Vol.16Issue(4)：70-76,7.DOI:10.12061/j.issn.2095-6223.202410018
近地面核爆炸放射性烟云颗粒大气输运及沉降特征研究
Atmospheric Transport and Fallout of Radioactive Particles From Surface Nuclear Explosions
摘要
Abstract
Surface nuclear explosions generate radioactive particles of varying sizes that undergo atmospheric dispersion,causing widespread contamination fallout.A computational model for atmospheric dispersion and fallout of radioactive cloud particles is developed based on gas-solid two-phase flow theory.A nuclear contamination fallout prediction program,FOPAC,is also developed,and preliminary validation of its computational outputs is conducted.Then,this paper employs the proposed model to simulate the atmospheric dispersion and fallout processes of radioactive particles from surface nuclear explosions and reveals the traces and fallout characteristics of radioactive particles during atmospheric transport.The results show that fallout particles with different sizes transport and descend in distinctly different manners.Large particles descend along parabolic trajectories in the effect of gravity and wind,falling more rapidly and leading to contamination near ground zero.Small particles move entirely with air currents,their trajectories are stochastic due to turbulence in the atmosphere boundary layer,and they fall more slowly,causing contamination far away from ground zero.The flux of crosswind particles adheres closely to Gaussian plume model predictions,whereas the flux of downwind particles exhibits measurable departures from normality.Importantly,the severity deviation is inversely proportional to particle size.关键词
放射性烟云/颗粒物/气固两相流方法/大气输运/沉降Key words
radioactive cloud/radioactive particle/gas-solid two-phase flow/atmospheric transport/fallout分类
能源科技引用本文复制引用
卓俊,黄流兴,牛胜利,朱金辉,李雅琦,李夏至..近地面核爆炸放射性烟云颗粒大气输运及沉降特征研究[J].现代应用物理,2025,16(4):70-76,7.基金项目
国家重点研发计划资助项目(2020YFA0709800) （2020YFA0709800）
