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of Japan. 137 Cs) through rivers into the sea have been studied. The solid-water distribution of RCs in river water is important because hydrated RCs, which is not subject to flocculation and sedimentation processes in the estuary area, may be the main form of RCs transported into oceans. Takata et al. (2015) evaluated the flux of dissolved and particulate 137 Cs from the river to the ocean to calculate the migration of 137 Cs in the ocean. The solid-water distribution is also important in terms of the intake of organisms. Thus, the solid-water distribution of RCs has been intensively studied with respect to the emission of RCs associated with the FDNPP accident (