title: Anthropogenic radionuclides in sediment in the Japan Sea: distribution and transport processes of particulate radionuclides.
abstract: Distributions of anthropogenic radionuclides ((90)Sr, (137)Cs and (239+240)Pu) in seabed sediment in the Japan Sea were collected during the period 1998-2002. Concentration of (90)Sr, (137)Cs and (239+240)Pu in seabed sediment was 0.07-1.6 Bq kg(-1), 0.4-9.1 Bq kg(-1) and 0.002-1.9 Bq kg(-1), respectively. In the northern basin of the sea (Japan Basin), (239+240)Pu/(137)Cs ratios in seabed sediment were higher and their variation was smaller compared to that in the southeastern regions of the sea. The higher (239+240)Pu/(137)Cs ratios throughout the Japan Basin were considered to reflect production of Pu-enriched particles in the surface layer and substantial sinking of particulate materials in this region. In the southern regions of the Japan Sea (<38 degrees N), both inventories and (239+240)Pu/(137)Cs ratios in sediment were larger than those in the other regions. In the southern Japan Sea, observations suggested that supply of particulate radionuclides by the Tsushima Warm Current mainly enhanced accumulation of the radionuclides in this region.
authors.affiliation: Marine Research Laboratory, Japan Atomic Energy Research Institute, 4-24, Minato-Machi, Mutsu, Aomori, Japan. otosaka.shigeyoshi@jaea.go.jp
authors.forename: S
authors.initials: S
authors.lastname: Otosaka
authors.forename: H
authors.initials: H
authors.lastname: Amano
authors.forename: T
authors.initials: T
authors.lastname: Ito
authors.forename: H
authors.initials: H
authors.lastname: Kawamura
authors.forename: T
authors.initials: T
authors.lastname: Kobayashi
authors.forename: T
authors.initials: T
authors.lastname: Suzuki
authors.forename: O
authors.initials: O
authors.lastname: Togawa
authors.forename: E L
authors.initials: EL
authors.lastname: Chaykovskaya
authors.forename: T S
authors.initials: TS
authors.lastname: Lishavskaya
authors.forename: V P
authors.initials: VP
authors.lastname: Novichkov
authors.forename: E V
authors.initials: EV
authors.lastname: Karasev
authors.forename: A V
authors.initials: AV
authors.lastname: Tkalin
authors.forename: Y N
authors.initials: YN
authors.lastname: Volkov
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis; D019015:Geologic Sediments / Q000737:chemistry*; D007564:Japan; D007856:Lead Radioisotopes / Q000032:analysis; D009792:Oceans and Seas; D011005:Plutonium / Q000032:analysis; D011850:Radioactive Waste / Q000032:analysis*; D011868:Radioisotopes / Q000032:analysis*; D013326:Strontium Radioisotopes / Q000032:analysis; D014186:Transportation
chemical_list: D002588:Cesium Radioisotopes; D007856:Lead Radioisotopes; D011850:Radioactive Waste; D011868:Radioisotopes; D013326:Strontium Radioisotopes; D011005:Plutonium