Development of a method for very low-level tritium analysis and tritium/helium-3 dating of seawater samples

• Project/Area Number: 21510008
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: The University of Tokyo
• Principal Investigator: TAKAHATA Naoto 東京大学, 大気海洋研究所, 助教 (90345059)
• Project Period (FY): 2009 – 2011
• Project Status: Completed (Fiscal Year 2011)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2011: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2010: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2009: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: 年代測定 / 希ガス / 同位体 / 分析技術 / 化学海洋 / 海洋環境

Research Abstract

I developed a method for very low-level tritium analysis of water samples. Duplicate water samples with different tritium concentrations were analyzed by both helium-3 ingrowth and conventional s-decay counting methods. The method compared equaling or surpassing conventional method with respect to detection limit, precision, time and effort for preparation. Tritium concentrations in surface seawaters collected from the Pacific Ocean were analyzed successfully.

Research Products

• [Journal Article] Hydrothermal fluid geochemistry at the Iheya north field in the mid-Okinawa Trough : Implication for origin of methane in subseafloor fluid circulation (2011)
  • Author(s): S.Kawagucci, et al.
  • Journal Title: Geochemical Journal Volume: 45 Pages: 109-124
  • Peer Reviewed
• [Journal Article] Helium isotopes of seawater in the Philippine Sea and the western North Pacific (2010)
  • Author(s): Takahata, N., Tokutake, T., Shirai, K., Fujio, S., Tanaka, K., and Sano, Y., J.
  • Journal Title: Geochemical Journal Volume: 44 Pages: 451-460
  • NAID: 10027719850
  • URL: http://www.terrapub.co.jp/journals/GJ/abstract/4406/44060451.html
  • Peer Reviewed
• [Journal Article] Evaluating Earth degassing in subduction zones by measuring helium fluxes from the ocean floor (2010)
  • Author(s): Lan, F. T., Sano, Y., Yang, F. T., Takahata, N., Shirai, K., and Pinti, D. L.
  • Journal Title: Earth and Planetary Science Letters Volume: 298 Issue: 3-4 Pages: 317-322
  • DOI: 10.1016/j.epsl.2010.07.049
  • Peer Reviewed
• [Journal Article] Gas geochemical characteristics of hydrothermal plumes at the HAKUREI and JADE vent sites, the Izena Cauldron, the Okinawa Trough (2010)
  • Author(s): S.Kawagucci, K.Shirai, T.F.Lan, N.Takahata, U.Tsunogai, Y.Sano, T.Gamo
  • Journal Title: Geochemical Journal Volume: 44 Pages: 507-518
  • NAID: 10027720032
  • Peer Reviewed
• [Journal Article] Distribution of helium-3 plume and deep-sea circulation in the northwestern Pacific Ocean (2009)
  • Author(s): Y.Sano, T.Tokutake, N.Takahata, K.Shirai, S.Fujio, K.Tanaka
  • Journal Title: Geochimica et Cosmochimica Acta 73
• [Journal Article] Sampling and analysis of dissolved noble gases in the porewater of marine sediments in northeastern Okinawa Trough, Japan (2009)
  • Author(s): T.F.Lan, N.Takahata, K.Kiyota, A.Kaneko, M.Tsutsumi, T.F.Yang, Y.Sano
  • Journal Title: Geochimica et Cosmochimica Acta 73
  • NAID: 130005053485
• [Presentation] インド洋におけるヘリウム同位体の分布 (2012)
  • Author(s): 高畑直人,原隆広,佐野有司
  • Organizer: 2011年度GEOTRACES国内シンポジウム
  • Place of Presentation: 千葉,日本
  • Year and Date: 2012-03-08
• [Presentation] インド洋におけるヘリウム同位体の分布 (2012)
  • Author(s): 高畑直人, 原隆広, 佐野有司
  • Organizer: GEOTRACES国内シンポジウム
  • Place of Presentation: 東京大学(千葉県)
  • Year and Date: 2012-03-08
• [Presentation] 海水のトリチウムーヘリウム-3年代測定の試み (2011)
  • Author(s): 高畑直人,佐野有司
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 千葉,日本
  • Year and Date: 2011-03-22
• [Presentation] 海水のトリチウム-ヘリウム-3年代測定の試み (2011)
  • Author(s): 高畑直人, 佐野有司
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 東京大学(千葉県)
  • Year and Date: 2011-03-22
• [Presentation] マルチトレーサーによる日本海底層水の循環と海水特性の解析 (2010)
  • Author(s): 荒巻能史, 乙坂重嘉, 高畑直人, 磯田豊, 久万健志, 千手智晴
  • Organizer: 日本海洋学会春季大会
  • Place of Presentation: 東京, 日本
  • Year and Date: 2010-03-27
• [Presentation] トリチウムーヘリウム-3法による海水の年代測定 (2009)
  • Author(s): 高畑直人,佐野有司,白井厚太朗,百島則幸
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 千葉,日本
  • Year and Date: 2009-09-16
• [Presentation] トリチウムーヘリウム-3法による海水の年代測定 (2009)
  • Author(s): 高畑直人, 佐野有司, 白井厚太朗, 百島則幸
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 広島, 日本
  • Year and Date: 2009-09-16
• [Presentation] 海洋深層へのヘリウム-3人為散布による海洋深層流評価の試み (2009)
  • Author(s): 亀田綾乃, 高畑直人, 北島宏輝, 藤尾伸三, 田中潔, 佐野有司
  • Organizer: 日本地球化学会年会
  • Place of Presentation: 広島, 日本
  • Year and Date: 2009-09-16
• [Presentation] Distribution of helium-3 plume and deep-sea circulation in the northwestern Pacific Ocean (2009)
  • Author(s): Y.Sano, T.Tokutake, N.Takahata, K.Shirai, S.Fujio, K.Tanaka
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Davos, Switzerland
  • Year and Date: 2009-06-23
• [Presentation] Sampling and analysis of dissolved noble gases in the porewater of marine sediments in northeastern Okinawa Trough, Japan (2009)
  • Author(s): T.F.Lan, N.Takahata, K.Kiyota, A.Kaneko, M.Tautsumi, T.F.Yang, Y.Sano
  • Organizer: Goldschmidt Conference
  • Place of Presentation: Davos, Switzerland
  • Year and Date: 2009-06-23
• [Book] Gas chemistry of pore fluids from Oomine Ridge on the Nankai accretionary prism. in Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin (2010)
  • Author(s): T.Toki, et al. Eds : Y.Ogawa, R.Anma, Y.Dilek
  • Total Pages: 450
  • Publisher: Springer-Verlag