Study on migration behavior of anthropogenic radionuclides in the Japan Sea, 4

Otosaka, Shigeyoshi  ; Ito, Toshimichi ; Togawa, Orihiko 

The authors summarized the migration behavior of particulate radionuclides in the Japan Sea as follows; (1) distributions of anthropogenic radionuclides in sediment reflect the biogecochemical cycle in the sea, (2) in the northwestern Japan Sea, particulate radionuclides in surface seawater were removed from the surface water column and transported to the deep part of the sea in spring, (3) particulate materials that are carried to the deep part of the northwestern Japan Sea are transported eastward and homogenized in the bottom layers, and (4) in the surface of the Japan Sea, most of lithogenic particles were carried through the atmosphere. These findings would play an important role to asses the factors controlling the distribution of the radionuclides in sediment in the sea.