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Report No.

Evaluating and categorizing the reliability of distribution coefficient values in the sorption database

Ochs, M.*; Saito, Yoshihiko; Kitamura, Akira; Shibata, Masahiro; Sasamoto, Hiroshi; Yui, Mikazu

Japan Atomic Energy Agency (JAEA) has developed the sorption database (SDB) for bentonite and rocks in order to assess the retardation property of important radioactive elements in natural and engineered barriers in the H12 report. The database includes distribution coefficient (K$$_{d}$$) of important radionuclides. The K$$_{d}$$ values in the SDB are about 20,000 data. The SDB includes a great variety of K$$_{d}$$ and additional key information from many different literatures. Accordingly, the following classification guideline and classification system were developed in order to evaluate the reliability of each K$$_{d}$$ value (Th, Pa, U, Np, Pu, Am, Cm, Cs, Ra, Se, Tc on bentonite). The reliability of 3740 K$$_{d}$$ values are evaluated and categorized.



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