Plutonium (Pu and Pu), Cs and plutonium activity ratios (Pu/Pu) as did uranium isotope ratio (U/U) were measured in surface soil samples collected in southeast Mongolia. The Pu and Cs concentrations in Mongolian surface soils (<53 μm of particle size) ranged from 0.42 ± 0.03 to 3.53 ± 0.09 mBq g and from 11.6 ± 0.7 to 102 ± 1 mBq g, respectively. The Pu/Pu activity ratios in the surface soils (0.013-0.06) coincided with that of global fallout. The U/U atom ratios in the surface soil show the natural one. There was a good correlation between the Pu and Cs concentrations in the surface soils. We introduce the migration depth to have better understanding of migration behaviors of anthropogenic radionuclides in surface soil. We found a difference of the migration behavior between Pu and Cs from Cs/Pu - Cs plots for the Mongolian and Tsukuba surface soils; plutonium in surface soil is migrated easier than Cs.
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