Development of ultrasensitive accelerator mass spectrometry for C-14 in quartz

• Project/Area Number: 16K16347
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Geography
• Research Institution: Kanazawa University (2017-2018); University of Tsukuba (2016)
• Principal Investigator: Matsunaka Tetsuya 金沢大学, 環日本海域環境研究センター, 助教 (60731966)
• Research Collaborator: SASA Kimikazu
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 炭素14 / ガス/固体ハイブリット型イオン源 / 加速器質量分析 / 氷河地形編年 / 宇宙線生成核種 / 石英 / 表面露出年代

Outline of Final Research Achievements

The first test of the 14C-accelerator mass spectrometry (AMS) system was successfully performed using a gas/solid hybrid ion source and an automated sample preparation system with an elemental analyzer (EA). The maximum 12C current of 11 µA was achieved using the optimized CO2 flow rate to the hybrid ion source. The machine background of 14C/12C for the AMS system reached to 2.4 × 10^-16 (0.02 percent modern carbon, pMC) using unprocessed mineral graphite. The blank level of 14C/12C including the combustion process for an IAEA-C1 graphite sample was 4.6 × 10^-16 (0.05 pMC), demonstrating the low blank level of the automatic sample preparation system. In contrast, the blank level of 14C/12C including the combustion process for an IAEA-C1 CO2 sample was 5.0 × 10^-15 (0.49 pMC), an order of magnitude worse than that for the graphite sample. The measurement uncertainty for the gas ion source was 0.6%, 2 times worse than that for the solid ion source (0.3%).

Academic Significance and Societal Importance of the Research Achievements

ガスイオン源を用いて、少なくとも0.5-1.0ミリグラムのCO2ガス試料について、グラファイト化処理を施す必要の無い、高感度で迅速な14C測定に成功した。前処理を含めて2日間で10試料の14C測定が可能であり、迅速性の観点から意義があるだけでなく、CO2として導入できる他の分析装置（元素分析計、レーザーアブレーション、ガスクロマトグラフ）とAMSを連結する応用研究が今後期待できる。

Research Products

• [Int'l Joint Research] 廣西師範大学(中国)
• [Int'l Joint Research] National Electrostatics Corporation(米国)
• [Int'l Joint Research] 廣西師範大学(中国)
• [Int'l Joint Research] National Electrostatics Corporation(米国)
• [Int'l Joint Research] 廣西師範大学(中国)
• [Int'l Joint Research] National Electrostatics Corporation(米国)
• [Journal Article] Radiocarbon variations in tree rings since 1960 near the Tokai nuclear facility, Japan (2019)
  • Author(s): Matsunaka, T., Sasa, K., Takahashi, T., Hosoya, S., Matsumura, M., Satou, Y., Shen, H., Sueki, K.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B Volume: 439 Pages: 64-69
  • DOI: 10.1016/j.nimb.2018.12.009
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Radiocarbon measurement using a gas/solid hybrid ion source and an automated sample preparation system at the University of Tsukuba (2019)
  • Author(s): Matsunaka, T., Sasa, K., Hosoya, S., Shen, H., Takahashi, T., Matsumura, M., Sueki, K.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B Volume: 印刷中 Pages: 204-208
  • DOI: 10.1016/j.nimb.2018.11.042
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Isobar suppression for 36Cl accelerator mass spectrometry at the University of Tsukuba (2019)
  • Author(s): Hosoya, S., Sasa, K., Takahashi, T., Matsunaka, T., Matsumura, M., Shen, H., Ota, Y., Takano, K., Ochiai, Y., Sueki, K.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B Volume: 438 Pages: 131-135
  • DOI: 10.1016/j.nimb.2018.07.001
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] The 6 MV multi-nuclide AMS system at the University of Tsukuba: First performance report (2018)
  • Author(s): Sasa, K., Takahashi, T., Matsunaka, T., Hosoya, S., Matsumura, M., Shen, H., Honda, M., Takano, K., Ochiai, Y., Sakaguchi, A., Sueki, K., Stodola, M., Sundquist, M.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B Volume: 437 Pages: 98-102
  • DOI: 10.1016/j.nimb.2018.09.011
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Operational status of the Tsukuba 6 MV multi-nuclide AMS system in fiscal 2017 (2018)
  • Author(s): Sasa, K., Takahashi, T., Matsunaka, T., Hosoya, S., Honda, M., Ota, Y., Takano, K., Ochiai, Y., Matsumura, M., Sueki, K.
  • Journal Title: UTTAC ANNUAL REPORT 2017 Volume: - Pages: 13-14
  • Open Access
• [Journal Article] Optimization of a ΔE-E detector for 41Ca AMS using PHITS code simulation (2017)
  • Author(s): Hosoya, S., Sasa, K., Matsunaka, T., Takahashi, T., Matsumura, M., Matsumura, H., Sundquist, M., Stadola, M., Sueki, K.
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms Volume: 406 Pages: 268-271
  • DOI: 10.1016/j.nimb.2017.03.161
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Variability of the 14C reservoir effects in Lake Tangra Yumco, Central Tibet (China), determined from recent sedimentation rates and dating of plant fossils (2017)
  • Author(s): Wang, J.B., Zhu, L.P., Wang, Y., Peng, P., Ma, Q.F., Haberzettl, T., Kasper, T., Matsunaka, T., Nakamura, T.
  • Journal Title: Quaternary International Volume: 430 Pages: 3-11
  • DOI: 10.1016/j.quaint.2015.10.084
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] 長寿命放射性核種36Clの加速器質量分析法による超高感度測定 (2017)
  • Author(s): 細谷青児, 笹公和, 高橋努, 松中哲也, 松村万寿美, Shen, H., 末木啓介
  • Journal Title: Proceedings of the 18th Workshop on Environmental Radioactivity Volume: -
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Operation of the Tsukuba 6 MV multi-nuclide AMS system for the year 2016 (2017)
  • Author(s): Sasa, K., Takahashi, T., Matsunaka, T., Hosoya, S., Matsumura, M., Shen, H., Honda, M., Ota, Y., Matsuo, K., Sakaguchi, A., Sueki, K.
  • Journal Title: UTTAC ANNUAL REPORT 2016 Volume: - Pages: 16-17
• [Journal Article] 36Cl AMS measurements with the 6 MV tandem accelerator (2017)
  • Author(s): Hosoya, S., Sasa, K., Takahashi, T., Matsunaka, T., Matsumura, M., Shen, H., Sueki, K.
  • Journal Title: UTTAC ANNUAL REPORT 2016 Volume: - Pages: 18-19
  • Int'l Joint Research
• [Journal Article] 41Ca-AMSの実用化に向けた技術開発と測定評価 (2017)
  • Author(s): 細谷青児, 笹公和, 高橋努, 松中哲也, 松村万寿美, Hongtao Shen, 末木啓介
  • Journal Title: 第19回AMSシンポジウム報告集 Volume: - Pages: 49-52
  • Int'l Joint Research
• [Journal Article] 筑波大学タンデム加速器施設UTTACの現状(2015年度) -稼働を開始した6 MVタンデム加速器によるイオンビーム利用研究の展望- (2017)
  • Author(s): 笹公和，石井聡，大島弘行，高橋努，田島義一，大和良広，関場大一郎，森口哲朗，左高正雄，楢本洋，工藤博，松村万寿美，山崎明義，松中哲也，喜多英治，上殿明良
  • Journal Title: 第29回タンデム加速器及びその周辺技術の研究会報告集 Volume: - Pages: 19-22
• [Journal Article] ガスイオン源を用いた迅速14C測定法の検討 (2017)
  • Author(s): 松中哲也, 笹公和, 細谷青児, 高橋努, 松村万寿美, 末木啓介
  • Journal Title: 第29回タンデム加速器及びその周辺技術の研究会報告集 Volume: - Pages: 150-153
  • Acknowledgement Compliant
• [Journal Article] 6MVタンデム型静電加速器におけるビーム輸送設定条件の検討 (2016)
  • Author(s): 黒尾奈未, 笹公和, 細谷青児, 松中哲也
  • Journal Title: 第13回日本加速器学会年会プロシーディングス Volume: - Pages: 1111-1114
  • Open Access
• [Journal Article] Detection tests of rare particles by the 6 MV tandem accelerator mass spectrometry system (2016)
  • Author(s): Sasa, K., Takahashi, T., Matsunaka, T., Matsumura, M., Hosoya, S., Sueki, K., Stodola, M., Sundquist, M.
  • Journal Title: UTTAC ANNUAL REPORT 2015 Volume: - Pages: 15-16
  • Open Access
• [Journal Article] Application of the PHITS code simulation for hard-to-measure nuclides of AMS (2016)
  • Author(s): Hosoya, S., Sasa, K., Matsunaka, T., Matsumura, M., Takahashi, T., Sundquist, M., Stodola, M., Sueki, K.
  • Journal Title: UTTAC ANNUAL REPORT 2015 Volume: - Pages: 17-18
  • Open Access
• [Presentation] Pre- and post-accident 14C activities in tree rings near the Fukushima nuclear facility (2019)
  • Author(s): Matsunaka, T., Sasa, K., Takahashi, T., Sueki, K., Matsuzaki, H.
  • Organizer: International Symposium “Research Frontiers of Transboundary Pollution”
  • Int'l Joint Research
• [Presentation] Pre- and post-accident 14C levels in tree rings within 25 km of the Fukushima Dai-ichi Nuclear Nuclear Power Plant (2018)
  • Author(s): Matsunaka, T., Sasa, K., Takahashi, T., Sueki, K., Matsuzaki, H.
  • Organizer: The 23rd International Radiocarbon Conference
  • Int'l Joint Research
• [Presentation] 筑波大学6 MVタンデム加速器質量分析装置における多核種AMSの技術開発 (2018)
  • Author(s): 笹公和, 高橋努, 松村万寿美, 高野健太, 落合悠太, 太田祐貴, 細谷青児, 本多真紀, 松中哲也, 坂口綾, 末木啓介
  • Organizer: 第21回AMSシンポジウム
• [Presentation] Performance of the New Tsukuba 6 MV AMS Facility for Radiocarbon Dating (2018)
  • Author(s): Sasa, K., Matsunaka, T., Takahashi, T., Hosoya, S., Sueki, K.
  • Organizer: The 23rd International Radiocarbon Conference
  • Int'l Joint Research
• [Presentation] Study on radiocarbon Dating of Chinese Ancient Tea Trees (2018)
  • Author(s): Shen, H., Chen, J., Sasa, K., Matsunaka, T., Hosoya, S., Matsumura, M., Takahashi, T., Sueki, K., He, M., Zhao, Q., Qin, X., Chen, X., Jiang, S.
  • Organizer: The 23rd International Radiocarbon Conference
  • Int'l Joint Research
• [Presentation] Development of gas ion source and automated sample preparation system for rapid C-14 measurement (2018)
  • Author(s): Matsunaka, T., Sasa, K., Hosaya, S., Shen, H., Sueki, K.
  • Organizer: International Symposium “Environmental researches in northern Japan Sea and related regions: Renewed horizon of Japan-Russia scientific partnership”
  • Int'l Joint Research
• [Presentation] 加速器質量分析法における10Be, 36Clの高感度測定のための同重体分離手法の検討とその測定性能評価 (2017)
  • Author(s): 細谷青児, 笹公和, 高橋努, 松中哲也, 松村万寿美, Hongtao Shen, 末木啓介
  • Organizer: 日本原子力学会2017年春の年会
  • Place of Presentation: 東海大学（神奈川県湘南市）
  • Year and Date: 2017-03-27
• [Presentation] Rapid C-14 measurement system at the University of Tsukuba and application for nuclear safety (2017)
  • Author(s): Matsunaka, T., Sasa, K., Hosoya, S., Shen, H., Takahashi, T., Matsumura, M., Sueki, K., Satou, Y.
  • Organizer: The 7th East Asia Accelerator Mass Spectrometry Symposium
  • Int'l Joint Research / Invited
• [Presentation] Progress in Multi-nuclide AMS Techniques for the 6 MV AMS System at the University of Tsukuba (2017)
  • Author(s): Sasa, K., Takahashi, T., Hosoya, S., Takano, K., Ochiai, Y., Honda, M., Ohta, Y., Sakaguchi, A., Masunaka, T., Shen, H., Sueki, K.
  • Organizer: The 7th East Asia Accelerator Mass Spectrometry Symposium
  • Int'l Joint Research / Invited
• [Presentation] Performance of the 6MV multi-nuclide AMS system at the University of Tsukuba (2017)
  • Author(s): Sasa, K., Takahashi, T., Matsunaka, T., Hosoya, S., Matsumura, M., Honda, M., Shen, H., Sakaguchi, A., Sueki, K., Stodola, M., Sundquist, M.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] Radiocarbon measurement system using gas ion source and automatic sample preparation system at the University of Tsukuba (2017)
  • Author(s): Matsunaka, T., Sasa, K., Hosoya, S., Shen, H., Takahashi, T., Matsumura, M., Sueki, K.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] Study on Multiple radionuclides for Exposure Age Dating of Chinese Tiankeng (2017)
  • Author(s): Shen, H., Sasa, K., He, M., Huang, B. Matsumura, M., Hosoya, S., Matsunaka, T., Takahashi, T., Honda, M., Sueki, K., Zhao, Q., Meng, Q., Dong, K., Wang, X., Pang, Y., Yang, X., Ruan, X., Jiang, S.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] TianKeng Sample Preparation for 36Cl-AMS (2017)
  • Author(s): Meng, Q., Shen, H., He, M. Sasa, K. Prof. Baojian, H., Matsumura, M., Matsunaka, T., Zhao, Q. Dong, K., Wang, X., Pang, Y., Yang, X., Xiangdong, R., Jiang, S.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] Isobar separation techniques of 41Ca AMS with the 6 MV tandem accelerator (2017)
  • Author(s): Sasa, K., Hosoya, S., Matsunaka, T., Takahashi, T., Matsumura, M., Shen, H., Oura, Y., Sueki, K.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] Isobar suppression for 36Cl-AMS with the 6 MV tandem accelerator (2017)
  • Author(s): Hosoya, S., Sasa, K., Takahashi, T., Matsunaka, T., Matsumura, M., Shen, H., Sueki, K.
  • Organizer: The Fourteenth International AMS Conference
  • Int'l Joint Research
• [Presentation] 筑波大学6 MVタンデム加速器質量分析装置による多核種AMSと応用研究の現状 (2017)
  • Author(s): 笹公和, 高橋努, 松中哲也, 細谷青児, 太田祐貴, 高野健太, 落合悠太, 本多真紀, 末木啓介
  • Organizer: 第20回AMSシンポジウム
• [Presentation] 6 MVタンデム加速器質量分析装置を用いた長半減期放射性核種の超高感度検出 (2017)
  • Author(s): 笹公和, 高橋努, 細谷青児, 高野健太, 落合悠太, 本多真紀, 太田祐貴, 松尾一樹, 松中哲也, 坂口綾, 末木啓介
  • Organizer: 2017年放射化学会年会・第61回放射化学討論会
• [Presentation] 極微量放射性核種を超高感度で検出可能な6 MVタンデム加速器質量分析装置の開発 (2017)
  • Author(s): 笹公和, 高橋努, 細谷青児, 高野健太, 落合悠太, 松中哲也, 末木啓介
  • Organizer: 第14回日本加速器学会年会
• [Presentation] 長寿命放射性核種36Clの加速器質量分析法による超高感度測定 (2017)
  • Author(s): 細谷青児, 笹公和, 松中哲也, 高橋努, 松村万寿美, Hongtao Shen, 末木啓介
  • Organizer: 第18回「環境放射能」研究会
• [Presentation] CO2ガスイオン源を用いた迅速14C-AMSの開発 (2016)
  • Author(s): 松中哲也, 笹公和, 細谷青児, 高橋努, 松村万寿美, 末木啓介
  • Organizer: 2016日本放射化学会年会・第60回放射化学討論会
  • Place of Presentation: 新潟大学（新潟県新潟市）
  • Year and Date: 2016-09-10
• [Presentation] 6MVタンデム型静電加速器におけるビーム輸送設定条件の検討 (2016)
  • Author(s): 黒尾奈未, 笹公和, 細谷青児, 松中哲也
  • Organizer: 第13回日本加速器学会年会
  • Place of Presentation: 幕張メッセ（千葉県幕張市）
  • Year and Date: 2016-08-08
• [Presentation] 筑波大学タンデム加速器施設UTTACの現状(2015年度) -稼働を開始した6 MVタンデム加速器によるイオンビーム利用研究の展望- (2016)
  • Author(s): 笹公和，石井聡，大島弘行，高橋努，田島義一，大和良広，関場大一郎，森口哲朗，左高正雄，楢本洋，工藤博，松村万寿美，山崎明義，松中哲也，喜多英治，上殿明良
  • Organizer: 第29回タンデム加速器及びその周辺技術の研究会
  • Place of Presentation: 筑波大学（茨城県つくば市）
  • Year and Date: 2016-06-30
• [Presentation] ガスイオン源を用いた迅速14C測定法の検討 (2016)
  • Author(s): 松中哲也, 笹公和, 細谷青児, 高橋努, 松村万寿美, 末木啓介
  • Organizer: 第29回タンデム加速器及びその周辺技術の研究会
  • Place of Presentation: 筑波大学（茨城県つくば市）
  • Year and Date: 2016-06-30
• [Remarks] 筑波大学AMSグループ
  • URL: http://www.tac.tsukuba.ac.jp/~ams/
• [Remarks] 金沢大学環日本海域環境研究センター
  • URL: http://www.ki-net.kanazawa-u.ac.jp/