Working Group on Assessment of Marine Environmental Quality of Radiation around the North Pacific

AGENDA ITEM 4 Term extension of the WG 30 The members discussed about the life term of the WG 30 and agreed to prolong it one-year to the end of 2017 in order to collect more data on radioactivity to support the conclusions on the risk assessment of the radionuclides from the FNA in the North Pacific for the final report of WG 30 and to complete the final report, one more scholar scientific paper. [...] This plume of radioactivity becomes very much diluted by the time it arrives off the North American coastline, but the eventual magnitude of the signal is difficult to predict owing to uncertainties in the quantity of material initially discharged from Fukushima, the trajectory of the plume and the degree of mixing that will occur with uncontaminated water. [...] Further, since the ratio of 134Cs /137Cs was about 1 for material discharged during the accident, then the contribution of Fukushima to the 137Cs inventory in the ocean can be simply estimated from the measured ratios knowing the time between sample analysis and the accident, itself. [...] We briefly report the situation of radioactivity contamination of marine environment in the waters of east Japan and the progress of the studies on environmental radioactivity in Japan. [...] Status of FDNPP accident to marine environment in the area near FDNPP The status of radioactive materials in the fisheries products off the coast of Fukushima Prefecture and the neighboring regions leaked by the FDNPP accident were summarized in the report "Report on the Monitoring of Radionuclides in Fishery Products" which was published by JFA on the web site, .