2016 Fiscal Year Annual Research Report
Understanding of the atmospheric deposition, diffusion processes and land atmospheric interaction of radioactive materials
Project Area | Interdisciplinary Study on Environmental Transfer of Radionuclides from the Fukushima Daiichi Nuclear Power Plant Accident |
Project/Area Number |
24110003
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Research Institution | Japan, Meteorological Research Institute |
Principal Investigator |
五十嵐 康人 気象庁気象研究所, 環境・応用気象研究部, 室長 (90343897)
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Co-Investigator(Kenkyū-buntansha) |
大河内 博 早稲田大学, 理工学術院, 教授 (00241117)
北 和之 茨城大学, 理学部, 教授 (30221914)
石塚 正秀 香川大学, 工学部, 准教授 (50324992)
吉田 尚弘 東京工業大学, 物質理工学院, 教授 (60174942)
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Project Period (FY) |
2012-06-28 – 2017-03-31
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Keywords | 環境放射能 / 環境質定量化・予測 / 大気現象 / 環境変動 / 地球化学 / 福島第一原発事故 / 環境・生体影響 / 陸域生態圏 |
Outline of Annual Research Achievements |
1)大気試料の組織的捕集と放射能分析:福島県浪江町の高線量率地域にて大気浮遊塵、降水サンプラーで観測を継続。分析は気象研、東工大、茨大で実施。さらにA04-8班の大阪大と連携し580試料以上を分析。Cs濃度の変動状況を調べた。 2)一次放出の解明:A03-5班の筑波大や公募班の東京理科大と連携し、浪江地区の表土などから引き続き不溶性高比放射能Cs粒子を抽出、SEM-EDS,SPring-8でのμX線分析で性状解明を進めた。土壌から得た粒子は、大気試料から得たCs粒子と同様シリカを主体とした組成をもつが、Cs同位体比測定や土壌採取地点の放射性物質のバルク測定から推定される発生源の違い(1号炉なのか2号炉なのか等)に応じ、比放射能、形状や微量元素組成に違いのあることがわかった。 3)二次放出の解明: A03-6班と連携し金沢大の専門家を研究協力者に加えて、引き続きバイオエアロゾルに関する観測を実施した。DNA解析の結果から、大気試料では担子菌起源のバイオエアロゾルが主体を占めており、降水試料では子嚢菌起源のバイオエアロゾルが顕著に検出されることが示された。また、光学顕微鏡で計数した有色胞子個数とCs-137濃度との間に相関が見出され、真菌類胞子のCs再飛散に関する重要性が確認された。 4)大気モデルの精度向上・再飛散モデル化:表土粒子飛散メカニズムを組み込んだ1D放射能飛砂モデルと新規の森林放出スキームを組み込んだエアロゾル化学輸送モデルによりCs再飛散に関し収支解析を行った。北緯34-39°、東経138-143°の領域でCsの再飛散量は1.28TBqで陸域沈着量2.68PBqの0.048%に相当し、このうちの17.2%の0.22TBqが主に東北地方に際沈着すると計算された。従って陸域のCsの消失に再飛散はほとんど寄与しないことが示された。
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Research Progress Status |
28年度が最終年度であるため、記入しない。
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Strategy for Future Research Activity |
28年度が最終年度であるため、記入しない。
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Research Products
(54 results)
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[Journal Article] Temporal changes in dissolved 137Cs concentrations in groundwater and stream water in Fukushima after the Fukushima Dai-ichi Nuclear Power Plant accident2017
Author(s)
Iwagami S, Tsujimura M, Onda Y, Nishino M, Konuma R, Abe Y, Hada M, Pun I, Sakaguchi A, Kondo H, Yamamoto M, Miyata Y, Igarashi Y
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Journal Title
Journal of Environmental Radioactivity
Volume: 166(3)
Pages: 458-465
DOI
Peer Reviewed / Open Access
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[Journal Article] Use of a size-resolved 1-D resuspension scheme to evaluate resuspended radioactive material associated with mineral dust particles from the ground surface2017
Author(s)
Masahide Ishizuka, Masao Mikami, Taichu Y. Tanaka, Yasuhito Igarashi, Kazuyuki Kita, Yutaka Yamada, Naohiro Yoshida, Sakae Toyoda, Yukihiko Satou, Takeshi Kinase, Kazuhiko Ninomiya, Atsushi Shinohara
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Journal Title
Journal of Environmental Radioactivity
Volume: 166(3)
Pages: 436-448
DOI
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Presentation] Long-term assessment of airborne radio-cesium after the Fukushima nuclear accident: Re-suspension from bare soil and vegetation2016
Author(s)
Kajino, M., Ishizuka, M., Igarashi, Y., Kita, K., Yoshikawa, C., and M. Inatsu
Organizer
European Aerosol Conference 2016
Place of Presentation
Tours, France
Year and Date
2016-09-05
Int'l Joint Research
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[Presentation] Novel hypothesis for Fukushima re-suspension: Biological processes, Topic: 2.18. Spcial Session 5: Radioactive Aerosol Transfer Linked to the Fukushima Event2016
Author(s)
Igarashi, Y., Kita, K., Kinase, T., Maki, T., Takenaka, C., Kajino, M., Adachi, K., Ishizuka, M., Sekiyama, T. T., Zaizen, Y., Ninomiya, K., Okochi, H., Sorimachi, A
Organizer
European Aerosol Conference 2016
Place of Presentation
Tours, France
Year and Date
2016-09-04 – 2016-09-09
Int'l Joint Research / Invited
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[Presentation] Long-Term Assessment of Airborne Radio-Cesium after the Fukushima Nuclear Accident: Re-suspension from Soil and Vegetation2016
Author(s)
Kajino, M., Ishizuka, M., Igarashi, Y., Kita, K., Yoshikawa, C., and M. Inatsu
Organizer
Goldschmidt 2016
Place of Presentation
Yokohama Japan
Year and Date
2016-06-30
Int'l Joint Research
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[Presentation] Re-suspension processes of radioactive Cs emitted by the FNDPP accident in summer and autumn-possibility of biosphere-atmosphere circulation of radioactive Cs2016
Author(s)
Kita, K., Kinase, T., Demizu, H., Igarashi, Y., Adachi, K., Kajino, M., Yamada, K., Toyoda, S., Yoshida, K. Ninomiya, N., Shinohara, A., Okochi, H., Ishizuka, M., Maki, T., Abe, Y., Nakai, I., Furukawa, J., Onda, Y
Organizer
Goldschmidt 2016
Place of Presentation
Yokohama Japan
Year and Date
2016-06-26 – 2016-07-01
Int'l Joint Research
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[Presentation] Resuspension processes of Fukushima radioCs: Could fungal spore play a significant role?2016
Author(s)
Igarashi, Y., Kita, K., Maki, T., Takenaka, C., Kinase, T., Adachi, K., Kajino, M., Sekiyama, T., Zaizen, Y., Ishizuka, M., Ninomiya, K., Okochi, H., Sorimachi, A
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
Chiba Japan
Year and Date
2016-05-23
Int'l Joint Research
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[Presentation] Re-suspension processes of radioactive Cs emitted by the FNDPP accident in summer and autumn-possibility of biosphere-atmosphere circulation of radioactive Cs2016
Author(s)
K.Kita, T.Kinase, T.Horiuchi, S.Sakamoto, A.Takei, H. Demizu, Y. Igarashi, K.Adachi, M.Kajino, K.Yamada, S.Toyoda, N. Yoshida, K.Ninomiya, A. Shinohara, H. Okochi, H. Ogata, M. Ishizuka, T. Maki, Y. Abe, I. Nakai, J. Furukawa, Y. Onda
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
Chiba Japan
Year and Date
2016-05-23
Int'l Joint Research
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[Presentation] Long-term assessment of airborne radio-cesium after the Fukushima nuclear accident: re-suspension from soil and vegetation2016
Author(s)
Kajino, M., Ishizuka, M., Igarashi, Y., Kita, K., Yoshikawa, C., and M. Inatsu
Organizer
Japan Geoscience Union Meeting 2016
Place of Presentation
Chiba Japan
Year and Date
2016-05-23
Int'l Joint Research
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[Presentation] Raphael Perillat, Irene Korsakissok, Vivien Mallet, Anne Mathieu, Thomas Sekiyama, Damien Didier, Mizuo Kajino, Yasuhito Igarashi, and Kouji Adachi2016
Author(s)
Raphael Perillat, Irene Korsakissok, Vivien Mallet, Anne Mathieu, Thomas Sekiyama, Damien Didier, Mizuo Kajino, Yasuhito Igarashi, and Kouji Adachi
Organizer
European Geosciences Union General Assembly 2016
Place of Presentation
Vienna Austria
Year and Date
2016-04-17 – 2016-04-22
Int'l Joint Research
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