1. Plutonium, 137Cs and uranium isotopes in Mongolian surface soils.
- Author
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Hirose, K., Kikawada, Y., Igarashi, Y., Fujiwara, H., Jugder, D., Matsumoto, Y., Oi, T., and Nomura, M.
- Subjects
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PLUTONIUM isotopes , *URANIUM isotopes , *SOIL sampling , *ANTHROPOGENIC effects on nature , *RADIOISOTOPES & the environment , *RADIOACTIVE substances in soils - Abstract
Plutonium ( 238 Pu and 239,240 Pu), 137 Cs and plutonium activity ratios ( 238 Pu/ 239,240 Pu) as did uranium isotope ratio ( 235 U/ 238 U) were measured in surface soil samples collected in southeast Mongolia. The 239,240 Pu and 137 Cs concentrations in Mongolian surface soils (<53 μm of particle size) ranged from 0.42 ± 0.03 to 3.53 ± 0.09 mBq g −1 and from 11.6 ± 0.7 to 102 ± 1 mBq g −1 , respectively. The 238 Pu/ 239,240 Pu activity ratios in the surface soils (0.013–0.06) coincided with that of global fallout. The 235 U/ 238 U atom ratios in the surface soil show the natural one. There was a good correlation between the 239,240 Pu and 137 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 239,240 Pu and 137 Cs from 137 Cs/ 239,240 Pu – 137 Cs plots for the Mongolian and Tsukuba surface soils; plutonium in surface soil is migrated easier than 137 Cs. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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