Contents of natural radioactive nuclides in soil in relation to their surface area

Journal Article · Fri Dec 10 04:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB087iB13p10857· OSTI ID:6151999

Megumi, K; Oka, T; Yaskawa, K; Sakanoue, M

Concentrations of uranium series nuclides (/sup 238/U, /sup 226/Ra, /sup 210/Pb), thorium series nuclides (/sup 228/Ra, /sup 212/Bi), and potassium in soil of a granitic belt were examined in relation to their surface area of soil, clay mineral composition, and the SiO/sub 2/ and Fe contents. In soil which is less weathered and has a surface area of around 10 m/sup 2//g, the /sup 238/U, /sup 226/Ra, /sup 210/Pb, /sup 228/Ra, and /sup 40/K contents increase with an increase the SiO/sub 2/ content related to the elemental compositions of their parents rocks. In homologous soils resulting from progressive weathering, the /sup 238/U, /sup 226/Ra, /sup 210/Pb, and /sup 228/Ra contents are found to increase with increasing surface area. For an homologous soil which is free from the clay consisting of three-layer units, the /sup 40/K content decrease with increasing surface area. However, in an homologous soil which contains a clay consisting of three-layer units, the /sup 40/K content is not surface area dependent.

• Research Organization: Radiation Center of Osaka Prefecture, Shinke-cho, Sakai-shi, Osaka, Japan
• OSTI ID: 6151999
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:B13; ISSN JGREA
• Country of Publication: United States
• Language: English

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