title: Migration of the FDNPP-derived134Cs and137Cs along with226Ra and228Ra concentrations across the northwestern North Pacific Ocean.
abstract: We examined lateral distributions of134Cs,137Cs,226Ra, and228Ra in the surface seawaters around the Kuril Islands and the Kamchatka Peninsula in the northwestern North Pacific Ocean during June 2014. The sampling area included three water current areas, the Oyashio Current, the current from the Okhotsk Sea, and the coastal current along the east Kamchatka Peninsula.226Ra and228Ra distributions differed along the three currents. Low levels of134Cs were detected in the surface waters of the Oyashio Current (0.09-0.35 mBq/L), but it was <∼0.1 mBq/L at the surface along the other two currents. This indicates that the distribution of Fukushima Dai-ichi Nuclear Power Plant (FDNPP)-derived radiocesium in surface waters off the Kamchatka and along the Kuril Islands is predominantly governed by the Oyashio current system.
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Nomi, Ishikawa, 923-1224, Japan. Electronic address: i247811@staff.kanazawa-u.ac.jp.
authors.forename: M
authors.initials: M
authors.lastname: Inoue
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Nomi, Ishikawa, 923-1224, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Shirotani
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Nomi, Ishikawa, 923-1224, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Nagao
authors.affiliation: Low Level Radioactivity Laboratory, Kanazawa University, Nomi, Ishikawa, 923-1224, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kofuji
authors.affiliation: Far Eastern Regional Hydrometeorological Research Institute, Vladivostok, 690996, Russia.
authors.forename: Y N
authors.initials: YN
authors.lastname: Volkov
authors.affiliation: Institute of Low Temperature Science, Hokkaido University, Kita-ku, Sapporo, 060-0819, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Nishioka
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D062406:Fukushima Nuclear Accident; D010140:Pacific Ocean; D011834:Radiation Monitoring; D011847:Radioactive Fallout / Q000032:analysis; D011883:Radium / Q000032:analysis*; D012623:Seawater; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D011847:Radioactive Fallout; D014875:Water Pollutants, Radioactive; D011883:Radium
keywords: Fukushima Dai-ichi Nuclear Power Plant accident; Northwestern North Pacific Ocean; Oyashio Current; Radiocesium; Radium