Balance of anthropogenic radionuclides in the Japan Sea

Tsuneyama, Teppei; Ito, Toshimichi ; Otosaka, Shigeyoshi  

The purpose of this study is to investigate the balance of the radionuclides in the Japan Sea by examining the all available data. In order to investigate the balance of the radionuclides in the Japan Sea, we examine the temporal changes of existing, incoming and outgoing amounts. The incoming amount is estimated as the sum of the amounts supplied from the atmosphere by global fallout and from the East China Sea by the Tsushima Warm Current. The outgoing amount is estimated as the sum of the amounts discharged from the Japan Sea and to seabed sediment. The existing amount is estimated by integrating the inventories over a whole surface of the Japan Sea. So, the temporal change of inventories must be elucidated in examining the temporal change of the existing amount. From the result, it is suggested that the rapid vertical transport exists in the Japan Sea as well as the slow transport. In our presentation, the balance of the radionuclides in seawater of the Japan Sea will be elucidated.