强激光与粒子束2025，Vol.37Issue(6)：139-146,8.DOI:10.11884/HPLPB202537.240408
束缚核效应对热中子活化的影响
Influence of bound nuclear effects on thermal neutron activation
摘要
Abstract
In a surface nuclear leakage scenario,radiation neutrons undergo multiple scatterings with atomic nuclei in the material,rapidly reducing their energy to the thermal neutron range(a few eV).The activation of thermal neutrons significantly impacts the nuclear reaction process.In solid and liquid materials,nuclei typically exist in bound states,differing from free nuclei in gaseous form regarding their interaction with matter.To accurately assess nuclear radiation effects,we investigated the impact of bound-nucleus effects on thermal neutron activation.Using the Monte Carlo method for particle transport simulation,we developed an air-ground interface model based on surface nuclear radiation scenarios.We modeled neutron beam interactions with soil,seawater,and concrete,focusing on thermal neutron activation reactions.By incorporating bound-nucleus effects through adjusted reaction cross-sections,we calculated and compared changes in secondary gamma flux before and after considering these effects.The results show that accounting for bound-nucleus effects enhances thermal neutron activation in solid and liquid media,thereby increasing surface secondary gamma field intensity.Due to factors such as elemental composition and particle shielding,the maximum increases in secondary gamma flux were 18%,8%,and 11%for the three media,with varying patterns of flux increase over detection distances.关键词
热中子活化/蒙特卡罗方法/束缚核/感生放射性/靶核热运动Key words
thermal neutron activation/Monte Carlo method/bound nucleus/induced radioactivity/target nucleus thermal motion分类
能源科技引用本文复制引用
郭志铭,郝建红,张芳,赵强,范杰清,董志伟..束缚核效应对热中子活化的影响[J].强激光与粒子束,2025,37(6):139-146,8.基金项目
国家自然科学基金项目(12205024) （12205024）
