Anthropogenic radionuclides in sediment in the Japan Sea: distribution and transport processes of particulate radionuclides |
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| Institution: | 1. Marine Research Laboratory, Japan Atomic Energy Research Institute, 4-24, Minato-machi, Mutsu, Aomori 035-0064, Japan;2. Research Group for Marine Environment, Japan Atomic Energy Research Institute, Tokai-Mura, Ibaraki 319-1195, Japan;3. Far Eastern Regional Hydrometeorological Research Institute, 24, Fontanaya St., Vladivostok, 690990, Russian Federation;4. Moscow State Engineering Physical Institute, 31, Kashirskiy Road, Moscow, 115409, Russian Federation;1. Isobarex Corp., 32 Nixon Road Unit #1, Bolton, ON L7E 1W2, Canada;2. IONICS Mass Spectrometry, 32 Nixon Road Unit #1, Bolton, ON L7E 1W2, Canada;3. Andre E. Lalonde Accelerator Mass Spectrometry Laboratory, Advanced Research Complex, University of Ottawa, 25 Templeton Street, Ottawa, ON K1N 6N5, Canada;4. IsoTrace Laboratory, Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3B1, Canada;1. Department of Marine Chemistry and Geochemistry MS?25, Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543, USA;2. MIT-WHOI Joint Program in Oceanography/Applied Ocean Science Engineering, 266 Woods Hole Road, Woods Hole, MA 02543, USA;1. The Key Laboratory of Earth Surface Processes and Regional Response in the Yangtze Huaihe River Basin, School of Geography and Tourism, Anhui Normal University, Wuhu, 241002, China;2. Technical University of Denmark, Department of Environmental Engineering, Risø Campus, Roskilde, DK-4000, Denmark;3. State Key Laboratory of Loess and Quaternary Geology, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi''an AMS Center, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an, 710061, China;4. China Institute for Radiation Protection, Taiyuan, 030000, China;1. School of Life Science, Shanxi University, Taiyuan, Shanxi, 030006, China;2. School of Physical Education, Shanxi University, Taiyuan, Shanxi, 030006, China;3. Taiyuan Monitoring Station of National Urban Water Quality Monitoring Network, Taiyuan, Shanxi, 030009, China;1. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China |
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| Abstract: | Distributions of anthropogenic radionuclides (90Sr, 137Cs and 239+240Pu) in seabed sediment in the Japan Sea were collected during the period 1998–2002. Concentration of 90Sr, 137Cs and 239+240Pu 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+240Pu/137Cs ratios in seabed sediment were higher and their variation was smaller compared to that in the southeastern regions of the sea. The higher 239+240Pu/137Cs 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°N), both inventories and 239+240Pu/137Cs 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. |
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