Environmental recovery from radiocesium-contaminated Japanese coastal waters

I showed the spatiotemporal distributions of radio-Cs (Cs-137) in Japanese coastal regions, including the waters off Miyagi, Fukushima, and Ibaraki prefectures, open to the western North Pacific, after the Fukushima Nuclear Power Plant accident. The effective half-lives after the accident were 1.6-4.7 y in Japanese coastal waters, suggesting that decreases in radio-Cs concentrations are largely dependent on the marine topography, and that the dilution-diffusion effect of seawater was greater in the Japanese coastal waters from the comparison with the effective half-lives of this nuclide in the surface waters of European seas.