Development of high time resoluution atmopheric tritium sampler and its application as environmental research

• Project/Area Number: 17K00559
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Risk sciences of radiation and chemicals
• Research Institution: Hirosaki University (2019-2020); 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): 2017-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
• Keywords: トリチウム / 環境放射能 / 水素エネルギー社会 / 水素分離技術 / 大気 / 高時間分解能 / トレーサー / 大気トリチウム / 膜分離

Outline of Final Research Achievements

We have developed a rapid sampling system for measuring the tritium in atmospheric water vapor. Compressed air (0.4 - 0.7MPa) is introduced into stainless steel column containing polyimide membrane tubes. Water vapor permeates through the tubes and is collected by cold traps cooled with dry ice and ethanol. We have determined the recovery yields under various sampling conditions and find that this system can collect atmospheric water vapor with a well recovery yield. This system can thus be a useful tool for understanding short-term observations of tritium in atmospheric water vapor.

Academic Significance and Societal Importance of the Research Achievements

ポリイミド中空糸分離膜（以下「分離膜」）は、核融合工学研究の一環として除湿もしくは水分回収のために研究が進められてきた。そこで、この分離膜の一般環境条件化における濃縮基本特性を明らかにした。また、分離した水分の高効率回収系を確立し、高時間分解能低濃度レベル大気トリチウム捕集システムを開発した。現在、脱炭素社会の実現に向けて核融合炉の研究がすすめられ、今後実証炉が稼働する。一方、福島第一原子力発電所事故により大量に発生したトリチウムを含む処理水は、今後海洋への放出が予定されている。更に、水素エネルギー社会の実現に向けてトリチウムを含む水素の環境挙動の理解は不可欠である。

Research Products

• [Int'l Joint Research] University of Pannonia(ハンガリー)
• [Int'l Joint Research] University of Pannonia(ハンガリー)
• [Int'l Joint Research] University of Pannonia(ハンガリー)
• [Journal Article] 210Pb and Major Ion Concentrations in Aerosols Collected in Qingdao, a Seaside Area of China (2021)
  • Author(s): Oumar Bobbo Modibo, Shinji Tokonami, Masahiro Hosoda, Yuki Tamakuma, Hu Jun, Miklos Hegedus, Eka Djatnika Nugraha, Saidou, Hirofumi Tazoe, Naofumi Akata, Yutaka Kanai, Fumitaka Yanagisawa, Renjian Zhang
  • Journal Title: Radiation Environment and Medicine Volume: 10 Pages: 18-25
  • 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, Miklos 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] 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
• [Journal Article] Expiratory Testing as a Simple and Effective Bioassay Method for Screening Workers for Tritium Exposure in Fusion Test Facilities (2018)
  • Author(s): AKATA Naofumi、IWATA Chie、MIYAKE Hitoshi、TANAKA Masahiro
  • Journal Title: Plasma and Fusion Research Volume: 13 Issue: 0 Pages: 1305076-1305076
  • DOI: 10.1585/pfr.13.1305076
  • NAID: 130007437815
  • ISSN: 1880-6821
  • Year and Date: 2018-06-12
  • Peer Reviewed / Open Access
• [Journal Article] Atmospheric Concentration and Deposition Flux of Cosmogenic Beryllium-7 at Toki, Central Part of Japan (2018)
  • Author(s): Akata, N., Shiroma, Y., Ikemoto, N., Kato, A., Hegedus, M., Tanaka, M., Kakiuchi, H., Kovacs, T.
  • Journal Title: Radiation Environment and Medicine Volume: 7 Pages: 47-52
  • NAID: 40021475376
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of rapid sampling system of atmospheric water vapor for tritium measurement (2018)
  • Author(s): Akata, N., Kakiuchi, H., Tanaka, M., Shima, N., Shiroma, Y., Tokonami, S., Hosoda, M., Ishikawa, Y., Furukawa, M., Sanada, T.
  • Journal Title: Plasma and Fusion Research Volume: 13
  • NAID: 130007437798
  • Peer Reviewed / Open Access
• [Journal Article] Concentrations of chemical components, including 210Pb, present in aerosols collected at Naha, Okinawa Prefecture, a sub-tropical region of Japan (2018)
  • Author(s): Akata, N., Shiroma, Y., Furukawa, M., Kato, A., Kakiuchi, H., Hosoda, M., Kanai, Y., Yanagisawa, F.
  • Journal Title: Japanese Journal of Health Physics Volume: 53 Pages: 17-22
  • NAID: 130007384324
  • Peer Reviewed / Open Access
• [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
  • Int'l Joint Research
• [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] 松葉標準試料（NIST-1575a）の非交換型OBT濃度 (2018)
  • Author(s): 赤田尚史，柿内秀樹，島長義，玉利俊哉
  • Organizer: 日本保健物理学会第51回研究発表会
• [Presentation] 極低濃度トリチウム計測手法を用いたトリチウム計測用バックグラウンド水の検討 (2017)
  • Author(s): 赤田尚史，城間吉貴，池本憲弘，細田正洋，柿内秀樹，床次眞司，古川雅英，下道國，岩岡和輝
  • Organizer: 日本保健物理学会第50回研究発表会
• [Presentation] Development of rapid sampling system of atmospheric water vapor for tritium measurement (2017)
  • Author(s): Akata, N., Kakiuchi, H., Tanaka, M., Shima, N., Shiroma, Y., Tokonami, S., Hosoda, M., Ishikawa, Y., Furukawa, M., Sanada, T.
  • Organizer: Joint meeting of 26th International Toki conference and 11th Asia Plasma & Fusion Association Conference
  • Int'l Joint Research