Distinctive distributions and migrations of 239+240 Pu and 241 Am in Chinese forest, grassland and desert soils

The vertical distributions and downward migrations of the global fallout derived Pu and Am in diverse types of Chinese soils (forest, grassland and desert) were studied. The mean Pu and Am activity concentrations in the investigated soil cores were 0.28-0.69 mBq/g and 0.13-0.37 mBq/g, respectively,...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2018-12, Vol.212, p.1002
Main Authors: Ni, Youyi, Wang, Zhongtang, Guo, Qiuju, Zheng, Jian, Li, Sixuan, Lin, Jinxian, Tan, Zhaoyi, Huang, Wenna
Format: Article
Language:English
Subjects:
Americium - analysis
China
Forests
Grassland
Plutonium - analysis
Radiation Monitoring
Radioactive Fallout - analysis
Soil
Soil Pollutants, Radioactive - analysis
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Summary:The vertical distributions and downward migrations of the global fallout derived Pu and Am in diverse types of Chinese soils (forest, grassland and desert) were studied. The mean Pu and Am activity concentrations in the investigated soil cores were 0.28-0.69 mBq/g and 0.13-0.37 mBq/g, respectively, while the accumulative inventories were 61.53-138.99 Bq/m for Pu and 28.29-61.05 Bq/m for Am. The convection-dispersion equation (CDE) was used to calculate the migration parameters of Pu and higher apparent dispersion coefficients (D) were observed for the acidic forest soils compared with the alkaline grassland and desert soils; meanwhile a compartment model was employed to compare the migration of Pu and Am in successive soil layers which showed that the migration behaviors of Pu and Am were rather similar; both velocities were less than 0.3 cm/y in diverse types of soils and these findings were compatible with those of short-term laboratory simulation experiments in China.
ISSN:1879-1298