Vertical distribution and migration of plutonium in the Loess Plateau, North Shaanxi, China
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The vertical distribution and migration behavior of 239+240Pu in a soil core in northern Loess Plateau in Shaanxi Province was investigated. The results showed that the 239+240Pu activity concentration was in the range of 0.02–0.75 mBq/g. The measured atom ratios of 240Pu/239Pu in the soil profile varied from 0.179 to 0.201 and were consistent with the typical global fallout. The inventory of 239+240Pu was 66 Bq/m2 in the sampling site and the proportion of Pu in the first 10 cm top layer accounted for around 75%. The apparent convection velocity and effective dispersion coefficient were 0.19 cm/year and 0.12 cm2/year by the convection dispersion equation model, respectively. Further investigation is still highly required to clarify the dominant factors that control Pu migration.
KeywordsPlutonium Soils Vertical distribution Migration behavior Loess Plateau
This work was partially supported by National Key Research and Invention Program of the Thirteenth (No. 2017YFC0504702); National Natural Science Funds of China (No. 41571260, 41701321); The Fundamental Research Funds for the Central Universities (No. GK201803047, GK201903075, GK201703051). Authors thank Dr. Huang Zhaoya for their support to sample analysis.
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Conflict of interest
The authors declare that they have no conflict of interest.
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