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Report No.

Study on migration behaviour of $$^{237}$$Np and $$^{241}$$Am in near-surface environments

Tanaka, Tadao ; Ya-Anant, N.*

Laboratory scale experiments were performed to investigate migration behavior of $$^{237}$$Np and $$^{241}$$Am, which were deposited onto the ground surface from spent fuel reprocessing facilities, in near-surface environment. Column migration experiments were conducted by varying the volume of eluting solution, for a sandy soil and a reddish soil. There seemed to be two chemical species of $$^{237}$$Np in the sandy soil column; one is cationic and the other is particulate form. The particulates moved without significant interaction with the sandy soil. The sorption of cationic $$^{237}$$Np was controlled by both a reversible ion-exchange reaction and irreversible reactions. Most of $$^{241}$$Am formed rather large particulates and trapped in the sandy soil column. The $$^{237}$$Np and $$^{241}$$Am loaded into the reddish soil column moved deeper with increasing eluting volume. The sorption was mainly controlled by ion-exchange reaction. The migration behavior could be significantly evaluated by the distribution coefficient.



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Category:Environmental Sciences



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