Abstract
The data stored in the IAEA’s Global Marine Radioactivity Database (GLOMARD) developed in the framework of the IAEA’s project “Worldwide Marine Radioactivity Studies (WOMARS)” have been evaluated for Pacific and Indian Ocean surface waters. Four anthropogenic radionuclides— 3H, 90Sr, 137Cs and 239,240Pu—have been chosen as the most representative of anthropogenic radioactivity in the marine environment, comprising beta, gamma and alpha-emitters which are the most frequently analysed in the marine environment and which have (with the exception of tritium) the highest potential contribution to radiation doses to humans via seafood consumption. For the purposes of this study, the Pacific and Indian Oceans were divided into latitudinal boxes for which average radionuclide concentrations were estimated for the year 2000. The highest concentrations have been observed in the Japan Sea/East Sea and the North-West Pacific Ocean, the lowest in the Southern Ocean.
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