Fallout of radiocesium-bearing particles and their foliar uptake

• Project/Area Number: 15K12206
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Risk sciences of radiation and chemicals
• Research Institution: Japan Atomic Energy Agency
• Principal Investigator: TANAKA Kazuya 国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 先端基礎研究センター, 研究副主幹 (60377992)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 放射性セシウム / 森林 / 福島

Outline of Final Research Achievements

Chemical state of Fukushima-derived radiocesium in trees was investigated. Cesium was weakly adsorbed as an outer-sphere complex on tree tissues, indicating that radiocesium is soluble species and translocated inside tree bodies. This is consistent with the fact that radiocesium is accumulated in growing parts.

Research Products

• [Journal Article] Mineralogical control of the size distribution of stable Cs and radiocesium in riverbed sediments (2018)
  • Author(s): Tanaka, K., Watanabe, N., Yamasaki, S., Sakaguchi, A., Fan, Q. and Takahashi, Y.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 52 Issue: 2 Pages: 173-185
  • DOI: 10.2343/geochemj.2.0501
  • NAID: 130006708582
  • ISSN: 0016-7002, 1880-5973
  • Year and Date: 2018-03-30
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Estimation of desorption ratios of radio/stable caesium from environmental samples (aerosols and soils) leached with seawater, diluted seawater and ultrapure water (2018)
  • Author(s): Sakaguchi, A. Chiga, H., Tanaka, K., Tsuruta, H. and Takahashi, Y.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 52 Issue: 2 Pages: 187-199
  • DOI: 10.2343/geochemj.2.0496
  • NAID: 130006708577
  • ISSN: 0016-7002, 1880-5973
  • Year and Date: 2018-03-30
  • Peer Reviewed / Open Access
• [Journal Article] Discovery of radiocesium-bearing microparticles in river water and their influence on the solid-water distribution coefficient (<i>K</i>_d) of radiocesium in the Kuchibuto River in Fukushima (2018)
  • Author(s): Miura, H. Kurihara, Y., Sakaguchi, A. Tanaka, K., Yamaguchi, N., Higaki, S. and Takahashi, Y.
  • Journal Title: GEOCHEMICAL JOURNAL Volume: 52 Issue: 2 Pages: 145-154
  • DOI: 10.2343/geochemj.2.0517
  • NAID: 130006708588
  • ISSN: 0016-7002, 1880-5973
  • Peer Reviewed / Open Access
• [Journal Article] Comparison of solid-water partitions of radiocesium in river waters in Fukushima and Chernobyl areas (2017)
  • Author(s): Y. Takahashi, Q. Fan, H. Suga, K. Tanaka, A. Sakaguchi, Y. Takeichi, K. Ono, K. Mase, K. Kato, and V. V. Kanivets
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 12407-12407
  • DOI: 10.1038/s41598-017-12391-7
  • NAID: 120007134717
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] 福島原発事故の地球化学：放射性核種の生成・飛散・移行 (2015)
  • Author(s): 田中 万也，高橋 嘉夫，福士 圭介，宇都宮 聡
  • Journal Title: 地球化学 Volume: 49 Pages: 169-171
  • NAID: 130005118184
  • Open Access
• [Presentation] Contamination of forests by the Fukushima Daiichi Nuclear Power Plant accident and chemical species of radiocesium in trees (2017)
  • Author(s): Tanaka K., Yamasaki S. and Takahashi Y.
  • Organizer: Migration2017
  • Int'l Joint Research
• [Presentation] Mineralogical control of stable Cs and radiocesium in riverbed sediment in Fukushima (2017)
  • Author(s): Tanaka K. and Yamasaki S.
  • Organizer: ICOBTE2017
  • Int'l Joint Research
• [Presentation] Micro to macro-scale observation of radiocesium released from the Fukushima Daiichi Nuclear Power Plant (2015)
  • Author(s): Tanaka K., Fan Q., Sakaguchi A. and Takahashi, Y.
  • Organizer: Pacifichem2015
  • Place of Presentation: Honolulu, Hawaii, USA
  • Year and Date: 2015-12-15
  • Invited
• [Presentation] 樹皮からのセシウム吸収およびその化学形態 (2015)
  • Author(s): 田中万也、高橋嘉夫
  • Organizer: 2015年度地球化学会年会
  • Place of Presentation: 横浜国立大学（神奈川県横浜市）
  • Year and Date: 2015-09-16