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根据美国Small Boy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。
According to the distribution of dose field in Near-field far-off field in the Small Boy experiment in the United States, the cumulative share of radioactive activity settling to the ground in different regions was calculated. Based on the Off-site dose field distribution map, Range, calculate the lower limit of particle size under the cumulative share of different radioactivity. The results show that the fraction of radioactive activity carried by the particles with particle sizes above 100 μm produced by the experiment is about 86% of the estimated result of the Bridgeman equation. The method can be extended to different explosive ground explosions and the analysis of the radioactive fraction of the sediments in the vicinity has some value for optimizing the radioactive fall forecasting program. For the development of the fractionation model, the distribution of radioactive substances in various particles is analyzed Etc. is of great significance.