A fractionation model based on three lognormal particle size distributions

Subjects: Nuclear Science and Technology >> Nuclear Materials and Techniques submitted time 2023-06-18 Cooperative journals: 《Nuclear Science and Techniques》

SHANG Jian-Bo SHI Quan-Lin WANG Qun-Shu ZHONG Zhen-Yuan LEI Bei-Fang LIU Jie BAI Tao DAI Yi-Hua LI Mou

Abstract： In this paper, a new model is proposed to calculate distribution of fission products in particles of different sizes. The model sensitivity to the effective volume and mass of vaporized soil particles is examined. Compared with other fractionation models, the new method has a much better performance in calculating r_89,95, but the calculated cumulative activity fraction for particles in diameters over 100 μm is in between the results using the F-T and G-X models. It is concluded that in a near surface nuclear explosion radioactivity is mainly distributed in soil particles which have not been vaporized, and according to the Henry’s law and ideal gas law, r_89,95 may vary in larger particles when effective volume of the fireball is changed.

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