Migration experiments of ~(241)Am~(34) had been performed y a column system, to investigate migration behavior of ~(241) Am through a column packed proous sedimentary materials: a coastal sandy soild and a reddish soil. Most ~(241)Am loaded into the column packed the reddish soil sorbed on the influent edge of the column. In the case of the sandy soil, however, considerable amount of ~(241)Am was passed through the column. This shows that there is solloidal ~(241)Am species which may move without effective interaction with the sandy soil.
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