复杂地形对核爆炸瞬发中子辐射场的影响

Influence of Complex Terrain on Prompt Neutron Radiation Field of Nuclear Detonation

通过分析地面附近核爆炸瞬发辐射的不同来源,选择一系列能反映局部或区域地形起伏对辐射场影响的特征参数,应用数字高程模型建立了地形特征计算方法,通过相关性分析和统计分析的方法,定量研究了地形特征对辐射场的具体影响。研究结果表明,指向和背离爆心方位的地形开阔度与辐射场增强或削弱程度成高度线性相关;地形坡面越陡,“阳坡”辐射场越易受到增强,而“阴坡”则越易受到削弱;地形可视性对中子吸收剂量场的影响较小,而对次级γ吸收剂量场则会造成显著影响,地形的完全遮挡将会显著削弱次级γ辐射场。

By analyzing different components of the prompt radiation near the ground from the nuclear detonation,a series of characteristic parameters that can reflect the influence of local or regional terrain fluctuations on the radiation field are selected.A terrain feature calculation method is established by using a digital elevation model.By means of correlation analysis and statistical analysis,the specific effect of various terrain features on the radiation field is quantitatively studied.The results show that the sky-view factors of the direction and departure from the center of burst are high linearly correlated with the degree of enhancement or weakening of the radiation field.The steeper the terrain slope,the easier the radiation field of"positive slope"is to be enhanced,while the"negative slope"is to be weakened.The terrain visibility has a relatively small impact on the neutron absorbed dose field,while it has a significant effect on the secondary gamma absorbed dose field.The complete occlusion of the terrain will weaken the secondary gamma radiation field.