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核技术  2014 

沉降放射性粒子的活度-粒径累计份额计算

DOI: 10.11889/j.0253-3219.2014.hjs.37.040204, PP. 40204-40204

Keywords: 放射性沉降,剂量场,累积放射性活度-粒径分布

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Abstract:

根据美国SmallBoy试验的近场远爆心区域(Off-site)剂量场分布图,计算了不同区域内沉降至地面的放射性活度累积份额,结合动力学沉降预报程序给出的不同粒径粒子落地范围,计算得到了不同放射性活度累积份额下的粒子粒径下限。结果表明,试验产生的百微米以上粒径的粒子携带的放射性活度份额约为Bridgeman方程估算结果的86%。本方法可以扩展至不同爆高的地面爆炸场景,分析其近区沉降物的放射性份额,对于优化放射性沉降预报程序具有一定价值;对于发展分凝模型、分析放射性物质在各种粒子中的分布规律等具有重要意义。

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