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Report No.

Sorption and diffusion of Cs in Horonobe-URL's sedimentary rock; Comparison and model prediction of retardation parameters from sorption and diffusion experiments

Tachi, Yukio  ; Seida, Yoshimi; Doi, Reisuke  ; Xia, X.*; Yui, Mikazu

Diffusion and sorption of Cs in the sedimentary rock of Horonobe generic URL site were studied in the present study. The retardation parameters, De and Kd, of rock for Cs were measured by both batch sorption and intact diffusion experiments with the comparison of obtained retardation parameters each other. The tracer depletion, breakthrough and inner concentration data in the through diffusion experiment were simulated simultaneously by the conventional transport model with one set of the retardation parameters. The Kd values obtained from the data fitting were consistent with those obtained by the batch sorption experiment with crushed rock. The obtained sorption parameters were also simulated based on geochemical model calculation to interpret the sorption behavior theoretically under the assumption of dominant sorption minerals and their sorption mechanism.



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