Study of the multi-isotope method to trace study of the natural tritium

• Project/Area Number: 17KK0015
• Research Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research)
• Allocation Type: Multi-year Fund
• Research Field: Risk sciences of radiation and chemicals
• Research Institution: Hirosaki University (2019-2022); National Institute for Fusion Science (2017-2018)
• Principal Investigator: Akata Naofumi 弘前大学, 被ばく医療総合研究所, 教授 (10715478)
• Project Period (FY): 2018 – 2022
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥10,400,000 (Direct Cost: ¥8,000,000、Indirect Cost: ¥2,400,000)
• Keywords: トリチウム / 宇宙線生成核種 / ベリリウム / マルチアイソトープ / ベリリウム-7 / ベリリウム7 / 天然起源 / トレーサー

Outline of Final Research Achievements

In the upper atmosphere, natural tritium is regularly produced at a rate of about five times the annual amount of anthropogenic tritium. Therefore, it can be said that "naturally occurring tritium" is regularly present in our living environment. However, the amount of advection of naturally occurring tritium into the troposphere during meteorological events, its physicochemical form and phase change, etc. have not been clarified. Since the Fukushima Daiichi Nuclear Power Plant accident, public interest in anthropogenic tritium has been high. This study aims to establish a multi-isotope method to track naturally occurring tritium by combining several natural and artificial radionuclides.

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Academic Significance and Societal Importance of the Research Achievements

福島第一原子力発電所では、廃炉に向けた作業がロードマップに沿って進められている。事故により溶けだした燃料は、注水により水没させることで遮蔽と冷却が進められているが、このプロセスで汚染水が生成され続けている。将来的には、トリチウム以外の放射性物質を取り除いたのちに海へ放出されるため、国民のトリチウムへの関心は高い。これらの社会的動機をカバーするうえでも、本研究において、濃度レベルや分布、追跡指標としての有効性を検証することは重要となる。

Research Products

• [Int'l Joint Research] University of Pannonia(ハンガリー) (2018)
• [Journal Article] Monthly Precipitation Collected at Hirosaki, Japan: Its Tritium Concentration and Chemical and Stable Isotope Compositions (2022)
  • Author(s): Kuwata Haruka、Akata Naofumi、Okada Kazusa、Tanaka Masahiro、Tazoe Hirofumi、Kurita Naoyuki、Otashiro Nao、Negami Ryoju、Suzuki Takahito、Tamakuma Yuki、Shiroma Yoshitaka、Hosoda Masahiro
  • Journal Title: Atmosphere Volume: 13 Issue: 5 Pages: 848-848
  • DOI: 10.3390/atmos13050848
  • Peer Reviewed / Open Access
• [Journal Article] TRITIUM CONCENTRATION IN MONTHLY PRECIPITATION NEAR THE FUSION TEST FACILITY IN JAPAN BEFORE AND AFTER THE DEUTERIUM PLASMA EXPERIMENT (2022)
  • Author(s): Akata Naofumi、Iwata Chie、Nakada Miki、Kato Akemi、Okada Kazusa、Kuwata Haruka、Nakasone Shunya、Tanaka Masahiro
  • Journal Title: Radiation Protection Dosimetry Volume: 198 Issue: 13-15 Pages: 976-984
  • DOI: 10.1093/rpd/ncac024
  • Peer Reviewed
• [Journal Article] PERFORMANCE EVALUATION OF COMMERCIAL SCINTILLATION COCKTAILS FOR LOW-LEVEL TRITIUM COUNTING BY HIGH-CAPACITY LIQUID SCINTILLATION COUNTER (2022)
  • Author(s): Kuwata Haruka、Tazoe Hirofumi、Kranrod Chutima、Fujiwara Kenso、Terashima Motoki、Matsueda Makoto、Hirao Shigekazu、Akata Naofumi
  • Journal Title: Radiation Protection Dosimetry Volume: 198 Issue: 13-15 Pages: 1014-1018
  • DOI: 10.1093/rpd/ncac040
  • Peer Reviewed / Open Access
• [Journal Article] Isotope and chemical composition of monthly precipitation collected at Sapporo, northern part of Japan during 2015-2019 (2021)
  • Author(s): Akata Naofumi、Kakiuchi Hideki、Tanaka Masahiro、Ishikawa Yoshio、Kurita Naoyuki、Furukawa Masahide、Hegedus Miklos、Kovacs Tibor、Gusyev Maksym、Sanada Tetsuya
  • Journal Title: Fusion Engineering and Design Volume: 168 Pages: 112434-112434
  • DOI: 10.1016/j.fusengdes.2021.112434
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Characterization of atmospheric 210Pb concentration and its relation to major ion species at Tsukuba, Japan (2021)
  • Author(s): Akata Naofumi、Iwata Chie、Nakada Miki、Tanaka Masahiro、Kakiuchi Hideki、Kovacs Tibor、Yanagisawa Fumitaka、Kanai Yutaka
  • Journal Title: Journal of Radioanalytical and Nuclear Chemistry Volume: 327 Issue: 2 Pages: 755-760
  • DOI: 10.1007/s10967-020-07568-w
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Preliminary Investigation of Pretreatment Methods for Liquid Scintillation Measurements of Environmental Water Samples Using Ion Exchange Resins (2020)
  • Author(s): Nakasone, S., Yokoyama, S., Takahashi, T., Ota, M., Kakiuchi, H., Sugihara, S., Hirao, S., Momoshima, N., Tamari, T., Shima, N., Atarashi-Andoh, M., Fukutani, S., Ishimine, A., Furukawa, M., Tanaka, M., Akata, N.
  • Journal Title: Plasma and Fusion Research Volume: 15 Issue: 0 Pages: 2405027-2405027
  • DOI: 10.1585/pfr.15.2405027
  • NAID: 130007846234
  • ISSN: 1880-6821
  • Year and Date: 2020-05-13
  • Peer Reviewed / Open Access
• [Journal Article] Low-volume Electrolytic Enrichment for Tritium Measurement Using Improved Solid Polymer Electrolyte System at NIFS and Its Application (2020)
  • Author(s): Naofumi Akata, Chie Iwata, Akemi Kato, Masahiro Tanaka, Hirofumi Tazoe, Nagayoshi Shima, Kimpei Ichiyanagi, Miklous Hegedus, Gergo Bator, Tibor Kovacs, Hideki Kakiuchi
  • Journal Title: Radiation Environment and Medicine Volume: 9 Pages: 93-97
  • NAID: 40022329373
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] TRITIUM, HYDROGEN AND OXYGEN ISOTOPE COMPOSITIONS IN MONTHLY PRECIPITATION SAMPLES COLLECTED AT TOKI, JAPAN (2019)
  • Author(s): Akata N、Hasegawa H、Sugihara S、Tanaka M、Furukawa M、Kurita N、Kov?cs T、Shiroma Y、Kakiuchi H
  • Journal Title: Radiation Protection Dosimetry Volume: 184 Issue: 3-4 Pages: 338-341
  • DOI: 10.1093/rpd/ncz062
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Development of Field Estimation Technique and Improvement of Environmental Tritium Behavior Model (2019)
  • Author(s): YOKOYAMA Sumi、TAKAHASHI Tomoyuki、OTA Masakazu、KAKIUCHI Hideki、SUGIHARA Shinji、HIRAO Shigekazu、MOMOSHIMA Noriyuki、TAMARI Toshiya、SHIMA Nagayoshi、ATARASHI-ANDOH Mariko、FUKUTANI Satoshi、NAKASONE Shunya、FURUKAWA Masahide、TANAKA Masahiro、AKATA Naofumi
  • Journal Title: Plasma and Fusion Research Volume: 14 Issue: 0 Pages: 3405099-3405099
  • DOI: 10.1585/pfr.14.3405099
  • NAID: 130007663779
  • Peer Reviewed / Open Access
• [Journal Article] Isotope Composition and Chemical Species of Monthly Precipitation Collected at the Site of a Fusion Test Facility in Japan (2019)
  • Author(s): Akata Naofumi、Tanaka Masahiro、Iwata Chie、Kato Akemi、Nakada Miki、Kov?cs Tibor、Kakiuchi Hideki
  • Journal Title: International Journal of Environmental Research and Public Health Volume: 16 Issue: 20 Pages: 3883-3883
  • DOI: 10.3390/ijerph16203883
  • NAID: 120007193409
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Determination of non-exchangeable organically bound tritium concentration in reference material of pine needles (NIST 1575a) (2019)
  • Author(s): Akata Naofumi、Kakiuchi Hideki、Shima Nagayoshi、Tamari Toshiya、Kov?cs Tibor
  • Journal Title: Journal of Radioanalytical and Nuclear Chemistry Volume: 319 Issue: 3 Pages: 1359-1363
  • DOI: 10.1007/s10967-018-6397-9
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Monitoring methodology of tritium in the environment (2023)
  • Author(s): N. Akata, R. Yamada, H. Kuwata, K. Kheamsiri
  • Organizer: Joint event on Environmental Radioactivity Research Network Center (ERAN) Annual Report Meeting and The 9th Annual Symposium of the IER
  • Int'l Joint Research / Invited
• [Presentation] 気圏環境におけるトリチウム計測技術 (2022)
  • Author(s): 赤田尚史，田中将裕，平尾茂一，玉利俊哉，柿内秀樹，杉原真司，桑田遥，田副博文
  • Organizer: 日本地球惑星科学連合2022年大会
  • Invited
• [Presentation] Tritium concentration in natural spring water collected at Hirosaki, Japan (2022)
  • Author(s): N. Akata, K. Okada, H. Kuwata, K. Kheamsiri, M. Hosoda, H. Tazoe, R. Yasuhara, S. Sugihara, R. Yamada, M. Tanaka
  • Organizer: The 31st International Toki Conference on Plasma and Fusion Research (ITC31)
  • Int'l Joint Research
• [Presentation] Assessment of Tritium from the Consumption of Bottled Drinking Water (2022)
  • Author(s): K. Kheamsiri, N. Akata, H. Kuwata, M. Tanaka, M. Hosoda, M. Sasaki, Y. Shiroma, S. Tokonami, K. Iwaoka, T. Kovacs
  • Organizer: 第4回日本保健物理学会・日本放射線安全管理学会合同大会
• [Presentation] Tritium Concentration in Bottled Drinking Water and Internal Dose Assessment (2022)
  • Author(s): K. Kheamsiri, N. Akata, H. Kuwata, M. Tanaka, M. Hosoda, M. Sasaki, Y. Shiroma, S. Tokonami, R. Yamada, K. Iwaoka, T. Kovacs
  • Organizer: The 9th Educational Symposium on Radiation and Health by young scientists
  • Int'l Joint Research
• [Presentation] 日本の降水中トリチウム濃度 (2021)
  • Author(s): 赤田尚史
  • Organizer: 第58回アイソトープ・放射線研究発表会
  • Invited
• [Presentation] PERFORMANCE EVALUATION OF COMMERCIAL SCINTILLATION COCKTAILS FOR LOW-LEVEL TRITIUM COUNTING (2021)
  • Author(s): H. Kuwata, H. Tazoe, C. Kranrod, K. Fujiwara, M. Terashima, M. Matsueda, S. Hirao, N. Akata
  • Organizer: International Symposium on the “Environmental Dynamics of Radionuclides and the Biological Effects of LowDose-rate Radiation“
  • Int'l Joint Research
• [Presentation] Isotope and chemical composition of monthly precipitation collected at Sapporo, northern part of Japan (2020)
  • Author(s): Naofumi Akata, Hideki Kakiuchi, Masahiro Tanaka, Yoshio Ishikawa, Naoyuki Kurita, Masahide Furukawa, Miklous Hegedus, Tibor Kovacs, Tetsuya Sanada
  • Organizer: 3rd Asia Pacific Symposium on Tritium Science (APSOT-3)
  • Int'l Joint Research
• [Presentation] 札幌市における大気水蒸気中トリチウム濃度の集中観測 (2019)
  • Author(s): 赤田尚史，柿内秀樹，岩田智恵，真田哲也
  • Organizer: 2019年度日本雪氷学会東北支部大会
• [Presentation] 蔵王の樹氷（アイスモンスター）(2) －人工衛星画像を用いた越境大気汚染物質解析－ (2019)
  • Author(s): 保原雄大，赤田尚史，柳澤文孝
  • Organizer: 雪氷研究大会2019山形
• [Presentation] 北海道札幌市で採取された降水のトリチウム濃度 (2019)
  • Author(s): 赤田尚史，岩田智恵，田中将裕，古川雅英，Kovacs Tibor，真田哲也
  • Organizer: 第2回日本放射線安全管理学会・日本保健物理学会合同大会
• [Presentation] Sampling system of tritium for atmospheric environment (2019)
  • Author(s): Naofumi Akata, Kovacs Tibor, Hideki Kakiuchi
  • Organizer: 2nd Workshop on Radiation Research and Related Issues 2019
• [Presentation] Preliminary investigation of pretreatment methods for liquid scintilation measurements of environmental water samples using ion exchange resins (2019)
  • Author(s): Shunya NAKASONE, Sumi YOKOYAMA, Tomoyuki TAKAHASHI, Masakazu OTA, Hideki KAKIUCHI, Shinji SUGIHARA, Shigekazu HIRAO, Noriyuki MOMOSHIMA, Toshiya TAMARI, Nagayoshi SHIMA, Mariko ATARASHI-ANDOH, Satoshi FUKUTANI, Akinobu ISHIMINE, Masahide FURUKAWA, Masahiro TANAKA, Naofumi AKATA
  • Organizer: The 28th International Toki Conference on Plasma and Fusion Research
• [Presentation] 岐阜県土岐市における７Beの大気中濃度および降下量の特徴 (2019)
  • Author(s): 中田実希、赤田尚史、小林真、加藤明巳、岩田智恵、林浩
  • Organizer: 第20回環境放射能研究会
• [Presentation] Determination of Non-Exchangeable Organically Bound Tritium concentration in reference material of pine needles (NIST 1575a) (2018)
  • Author(s): Akata, N., Kakiuchi, H., Shima, N., Tamari, T.
  • Organizer: VI. Terrestrial Radioisotopes in Environment International Conference on Environmental Protection
  • Int'l Joint Research
• [Presentation] 高時間分解能大気水蒸気捕集システムの開発 (2018)
  • Author(s): 赤田尚史，田中将裕，柿内秀樹，城間吉貴，細田正洋，岩岡和輝，床次眞司，古川雅英，Tibor Kovacs，真田哲也
  • Organizer: 2018年度日本雪氷学会東北支部大会
• [Presentation] CHEMICAL AND ISOTOPE COMPOSITION OF MONTHLY PRECIPITATION COLLECTED AT TOKI, JAPAN (2018)
  • Author(s): Akata, N., Hasegawa, H., Sugihara, S., Tanaka, M., Furukawa, M., Kurita, N., Kovacs, T., Shiroma, Y., Kakiuchi, H.
  • Organizer: 9th International Conference on High Level Environmental Radiation Areas
  • Int'l Joint Research