Assessment of soil-soil solution distribution coefficients of global fallout 237 Np and 239 Pu in Japanese upland soils.

Autor: Zheng J; National Institute for Radiological Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, 263-8555, Japan. Electronic address: zheng.jian@qst.go.jp., Tagami K; National Institute for Radiological Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, 263-8555, Japan., Uchida S; National Institute for Radiological Science, National Institutes for Quantum Science and Technology (QST), 4-9-1 Anagawa, Inage, Chiba, 263-8555, Japan., Shibutani S; Nuclear Waste Management Organization of Japan, 4-1-23 Shiba, Minato-ku, Tokyo, 108-0014, Japan., Ishida K; Nuclear Waste Management Organization of Japan, 4-1-23 Shiba, Minato-ku, Tokyo, 108-0014, Japan., Hamamoto T; Nuclear Waste Management Organization of Japan, 4-1-23 Shiba, Minato-ku, Tokyo, 108-0014, Japan.
Jazyk: angličtina
Zdroj: Journal of environmental radioactivity [J Environ Radioact] 2023 Oct; Vol. 266-267, pp. 107241. Date of Electronic Publication: 2023 Jul 14.
DOI: 10.1016/j.jenvrad.2023.107241
Abstrakt: Neptunium-237 and 239 Pu 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 particular importance for their radiation dose evaluation; therefore, in this study, we have made the assessment of the soil-soil solution distribution coefficient (K d , L/kg) using global fallout 237 Np and 239 Pu in Japanese upland soils. The K d values were determined by extracting these radionuclides from 24 soil samples using a laboratory batch method. The desorption K d values of 237 Np ranged from 3.3 × 10 2 to 1.0 × 10 4  L/kg, and their geometric mean (GM) and arithmetic mean (AM) were 1.7 × 10 3  L/kg and 2.6 × 10 3  L/kg, respectively. The desorption K d values of 239 Pu were found to vary from 9.4 × 10 3 to 7.1 × 10 4  L/kg, and their GM and AM were 3.3 × 10 4  L/kg and 4.0 × 10 4  L/kg, respectively. In Japanese upland soils, the K d value of 239 Pu was one order of magnitude higher than that of 237 Np.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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