@article{oai:repo.qst.go.jp:00058365, author = {ト, 文庭 and 鄭, 建 and 田上, 恵子 and 内田, 滋夫 and et.al and ト 文庭 and 鄭 建 and 田上 恵子 and 内田 滋夫}, journal = {Distribution of plutonium isotopes in marine sediments off Japan before and after the Fukushima Daiichi Nuclear Power Plant accident: a review. Chapter 9, in Radiation Monitoring and Dose Estimation of the Fukushima Nuclear Accident. S. Takahashi (Ed.)}, month = {Jan}, note = {Large amount of radionuclides were released into the atmosphere and directly discharged into the ocean due to the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident. The possible actinides, especially plutonium contamination in the ocean from the nuclear accident attracted general public and scientific concern. In this review, we summarized the studies about the distribution of Pu isotopes in the marine sediments off Japan before and after the FDNPP accident to assess the possible Pu contamination from the nuclear accident. Our results suggested that there were no detectable extra Pu injection from the FDNPP accident in the marine environment 30 km off the FDNPP one year after the accident. The Pu isotopes originated from global fallout and the Pacific Proving Ground close-in fallout.}, title = {Distribution of plutonium isotopes in marine sediments off Japan before and after the Fukushima Daiichi Nuclear Power Plant accident: a review. Chapter 9, in Radiation Monitoring and Dose Estimation of the Fukushima Nuclear Accident. S. Takahashi (Ed.)}, year = {2014} }