Geochemical cycles in the Japan Sea from spatial distributions of multi-radionuclides

2011 Fiscal Year Final Research Report

• Project/Area Number: 21510011
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: Kanazawa University
• Principal Investigator: INOUE Mutsuo 金沢大学, 環日本海域環境研究センター, 助教 (60283090)
• Co-Investigator(Kenkyū-buntansha): YAMAMOTO Masayoshi 金沢大学, 環日本海域環境研究センター, 教授 (10121295) ; HAMAJIMA Yasunori 金沢大学, 環日本海域環境研究センター, 助教 (60172970)
• Co-Investigator(Renkei-kenkyūsha): MINAKAWA Masayuki 水産総合研究センター中央水産研究所, 海洋生産部, 室長 (80371839) ; OTOSAKA Shigeyoshi 日本原子力研究開発機構, 原子力基礎工学研究部門, 研究員 (40370374)
• Project Period (FY): 2009 – 2011
• Keywords: 海洋化学 / 放射性核種 / ガンマ線計測 / 日本海 / 物質循環

Research Abstract

In this study, we applied low-background gamma-spectrometry to conduct a investigations of spatial and temporal variations of^<226> Ra,^<228> Ra,^<137> Cs,^<134> Cs, and^<228> Th activities in the Japan Sea, the East China Sea, and the southwestern Okhotsk Sea. We could elucidate the flow patterns of water masses and particles in these areas(e. g., vertical water circulation and lateral mixing of surface water masses). We also clarified contamination levels and delivery pattern of radiocesium after the Fukushima Dai-ichi Nuclear Power Plant accident

Research Products

• [Journal Article] ^<134> Cs and^<137> Cs activities in coastal seawater along Northern Sanriku and Tsugaru Strait northeastern Japan (2012)
  • Author(s): Inoue, M., Kofuji, H., Hamajima, Y., Nagao, S., Yoshida, K., Yamamoto, M.
  • Journal Title: J. Environ. Radioactivity Volume: (in press)
  • Peer Reviewed
• [Journal Article] Lateral variation of^<134> Cs and^<137> Cs concentrations in surface seawater in and around the Japan Sea after the Fukushima Dai-ichi Nuclear Power lant accident (2012)
  • Author(s): Inoue, M., Kofuji, H., Nagao, S., Yamamoto, M., Hamajima, Y., Yoshida, K. Fujimoto, K., Takada, T., Isoda, Y.
  • Journal Title: J. Environ. Radioactivity Volume: 109 Pages: 45-51
  • Peer Reviewed
• [Journal Article] Spatial variations of^<226> Ra,^<228> Ra,^<137> Cs, and^<228> Th activities, in the southwestern Okhotsk Sea (2012)
  • Author(s): Inoue, M., Yoshida, K., Minakawa, M., Kofuji, H., Nagao, S., Hamajima, Y., Yamamoto, M.
  • Journal Title: J. Environ. Radioactivity Volume: 104 Pages: 75-80
  • Peer Reviewed
• [Journal Article] Seasonal variation of^<228> Ra/^<226> Ra ratio in surface water from the East China Sea and the Tsushima Strait (2010)
  • Author(s): Inoue, M., Nakano, Y., Yoshida, K., Kiyomoto, Y., Kofuji, H., Hamajima, Y., Yamamoto, M.
  • Journal Title: J. Oceanogr Volume: 66 Pages: 425-428
  • Peer Reviewed
• [Presentation] 東シナ海表層海水の^<226> Ra,^<228> Raおよび^<228> Th濃度の季節変動 (2011)
  • Author(s): 井上睦夫、吉田圭佑、皆川昌幸、清本容子、小藤久毅、長尾誠也、浜島靖典、山本政儀
  • Organizer: 第55回放射化学討論会
  • Place of Presentation: 長野県
  • Year and Date: 2011-09-22
• [Presentation] Spatial distributions of^<226> Ra,^<228> Ra,^<228> Th, and^<137> Cs in the southwestern area of the Seaof Okhotsk (2010)
  • Author(s): Inoue, M., Yoshida, K., Minakawa, M., Kofuji, H., Nagao, S., Hamajima, Y., Shiomoto, A., Yamamoto, M.
  • Organizer: Environmental Radioactivity-New Frontiers and Developments-
  • Place of Presentation: イタリア
  • Year and Date: 2010-10-25
• [Presentation] Verticaldistributions of^<228> Ra and^<226> Ra in the Japan Basin ; implications for water circulation and residence time (2009)
  • Author(s): Inoue, M., Minakawa, M., Yoshida, K., Nakano, Y., Kofuji, H., Nagao, S., Hamajima, Y., Yamamoto, M.
  • Organizer: Asia-Pacific Symposium onRadiochemistry' 09
  • Place of Presentation: USA
  • Year and Date: 2009-12-01
• [Presentation] Seasonal variation of the^<228> Ra/^<226> Ra ratio in surface waters withinthe Sea of Japan and the Eat China Sea (2009)
  • Author(s): Inoue, M., Nakano, Y., Tanaka, K., Watanabe, S., Kofuji, H., Minakawa, M., Kiyomoto, Y., Yamamoto, M., Hamajima, Y., Komura, K.
  • Organizer: Low-level Measurement of Radionucldes and Its Application to Earth and Environmental Sciences
  • Place of Presentation: 石川県
  • Year and Date: 2009-11-05
• [Presentation] Distributions of^3H,^7Be,^<22> Na,^<137> Cs, and^<228> Ra of groundwater, river water, andprecipitation in Tedori River Area, Ishikawa (2009)
  • Author(s): Inoue, M., Kofuji, H., Komura, K.
  • Organizer: Low-level Measurement of Radionucldes and Its Application to Earth and Environmental Sciences
  • Place of Presentation: 石川県
  • Year and Date: 2009-11-05
• [Book] Vertical distributions of^<226> Ra,^<228> Ra, and^<137> Cs activities in the southwestern part of the Sea of OkhotskIn Environmental Radioactivity (2010)
  • Author(s): Inoue, M., Yoshida, K., Minakawa, M., Kofuji, H., Nagao, S., Hamajima, Y., Yamamoto, M.
  • Total Pages: 4001
• [Book] Seasonal variations of^<228> Ra/^<226> Ra and^<228> Th/^<228> Ra ratios in surface water from the eastern East China SeaIn Environmental Radioactivity (2010)
  • Author(s): Yoshida, K., Inoue, M., Kiyomoto, Y., Minakawa, M., Kofuji, H., Nagao, S., Hamajima, Y., Yamamoto, M.
  • Total Pages: 4005
• [Book] Seasonal variation of the^<228> Ra/^<226> Ra ratio in surface waters within the Sea of Japan and the Eat China SeaIn Low-level Measurement of Radionucldes and Its Application to Earth and Environmental Sciences (2010)
  • Author(s): Inoue, M., Nakano, Y., Tanaka, K., Watanabe, S., Kofuji, H., Minakawa, M., Kiyomoto, Y., Yamamoto, M., Hamajima, Y., Komura, K.
  • Total Pages: 23-28
• [Book] In Low-level Measurement of Radionucldes and Its Application to Earth and Environmental Sciences (2010)
  • Author(s): Inoue, M., Kofuji, H., Komura, K.
  • Total Pages: 178-182
• [Book] Distributions of^<228> Ra and^<226> Ra in surface water off Shimokita PeninsulaIn Low-level Measurement of Radionucldes and Its Application to Earth and Environmental Sciences (2010)
  • Author(s): Kofuji, H., Inoue, M.
  • Total Pages: 98-105
• [Book] Seasonal variationof^<228> Th and^<228> Ra in surface water on EastChina SeaIn Low-level Measurement of Radionuclides and Its Application to Earth and Environmental Sciences (2010)
  • Author(s): Yoshida, K., Inoue, M., Nakano, Y., Kiyomoto, Y., Nagao, S., Hamajima, Y., Yamamoto, M.
  • Total Pages: 94-97