@article{oai:repo.qst.go.jp:00084965,
 author = {Zheng, Jian and Keiko, Tagami and Shigeo, Uchida and Shibutani, Sanae and Ishida, Keisuke and Hamamoto, Takafumi and Zheng, Jian and Keiko, Tagami and Shigeo, Uchida},
 issue = {1},
 journal = {Chemosphere},
 month = {Mar},
 note = {239Pu and 237Np are long-lived radionuclides that emit alpha rays, and once released into the environment, they will exist in the environment for a long period of time. Therefore,239Pu and 237Np are important radionuclides in the safety assessment related to geological disposal of radioactive waste because of the possibility of long-term exposure to humans. Mobilities of these radionuclides in the environment are of interest, therefore, in this study, for the first time, soil-soil solution distribution coefficient (Kd, L/kg) was determined using global fallout 239Pu and 237Np in soil. The Kd values were determined by extracting these radionuclides from 23 soil samples using a laboratory batch method. The desorption Kd values of 239Pu are found to vary from 3.2×103 to 1.4×105 L/kg, and its geometric mean (GM) and arithmetic mean (AM) are 2.3×104 L/kg and 3.2×104 L/kg, respectively. The desorption Kd values of 237Np range from 8.9×102 to 2.1×104 L/kg, and its GM and AM are 4.1×103 L/kg and 6.4×103 L/kg, respectively. A comparison between the obtained Kd of 239Pu and 237Np indicated that 239Pu Kd were about 6-fold higher than 237Np in Japanese paddy field soils. Pearson’s correlation analysis suggested that the main factors contributing to the sorption/desorption of Pu isotopes in Japanese paddy soils were related to the amounts of Fe and Mn oxides, while the sorption/desorption of 237Np in Japanese paddy soils would be controlled by an ion-exchange reaction, and/or complex-formation with organic matter, especially in Fluvisols.},
 title = {Soil-soil solution distribution coefficients of global fallout 239Pu and 237Np  in Japanese paddy soils},
 volume = {291},
 year = {2022}
}