Investigation of atmospheric resuspension of radiocesium released by Fukushima Dai'ichi Nuclear Power Plant accident and its circulation between atmosphere and vegetation
Project/Area Number |
17H01873
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
Risk sciences of radiation and chemicals
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Research Institution | Ibaraki University |
Principal Investigator |
KITA Kazuyuki 茨城大学, 理工学研究科(理学野), 教授 (30221914)
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Co-Investigator(Kenkyū-buntansha) |
古川 純 筑波大学, 生命環境系, 准教授 (40451687)
石塚 正秀 香川大学, 創造工学部, 教授 (50324992)
森野 悠 国立研究開発法人国立環境研究所, 地域環境研究センター, 主任研究員 (50462495)
反町 篤行 福島県立医科大学, 医学部, 准教授 (60466050)
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Project Period (FY) |
2017-04-01 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥17,940,000 (Direct Cost: ¥13,800,000、Indirect Cost: ¥4,140,000)
Fiscal Year 2019: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2017: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
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Keywords | 放射性セシウム / 大気再飛散 / 放出フラックス / 真菌胞子 / バイオエアロゾル / 大気植生間循環 / 大気再飛散フラックス / 緩和渦集積法 / フラックス / 大気放射能 / 物質循環 / 真菌類 / 環境放射能 / 福島第一原子力発電所事故 |
Outline of Final Research Achievements |
Radioactive cesium emitted to the environment by the Fukushima Daiichi Nuclear Power Plant (F1NPP) accident has been re-suspended to the atmosphere even now after more than 8-years has passed. Based on the continuous sampling of aerosols and rain water at a site in heavily polluted area in Fukushima, the following results have been obtained: 1. Atmospheric concentration of radio-cesium activity has been more than 10 times higher than those before the accident, and was higher from spring to autumn. 2. Correlation among the atmospheric concentrations of cesium radioactivity and chemical and biological composition of aerosol showed that main host particle for the cesium re-suspension was soil dust in winter and early spring and was fungal spore in summer and autumn. 3. Aerosol radio-cesium in summer can be absorbed by plants. 4. By adopting a 1-dimensional model, emission flux of radio-cesium re-suspension could be calculated from vertical gradient of atmospheric activity concentration.
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Academic Significance and Societal Importance of the Research Achievements |
本研究により、福島第一原子力発電所事故により環境中に放出された放射性セシウムが、現在も大気中に土壌や植生から再飛散し、事故以前より桁違いに高い濃度を保ち、特に暖候期に比較的高濃度となっていることが明らかになった。また、放射性セシウムの大気放出フラックスの推定に成功し、放射性セシウムの移行拡散のモデルに取り入れることを可能とした。 放射性セシウムが大気に再飛散するメカニズムとして、冬季から春季までは鉱物粒子の風による巻き上げが、夏季から秋季には真菌類胞子の大気放出が重要であることが明らかになった。また夏季の大気放射性セシウムは一部植物に吸収され、大気植物間循環が起こっていることが明らかになった。
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Report
(4 results)
Research Products
(58 results)
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[Journal Article] Reassessment of early 131I inhalation doses by the Fukushima nuclear accident based on atmospheric 137Cs and 131I/137Cs observation data and multi-ensemble of atmospheric transport and deposition models2020
Author(s)
Takagi M., Ohara T., Goto D., Morino Y., Nakayama S.F., Uchida J., Sekiyama T.T., Ebihara M., Oura Y., Nakajima T., Tsuruta H., Moriguchi Y.
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Journal Title
Journal of Environmental Radioactivity
Volume: 218
Pages: 106233-106233
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Application of linear minimum variance estimation to the multi-model ensemble of atmospheric radioactive Cs-137 with observations2020
Author(s)
Goto, D., Morino, Y., Ohara, T., Sekiyama, T. T., Uchida, J., and Nakajima, T.
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Journal Title
Atmospheric Chemstry and Physics
Volume: 20
Issue: 6
Pages: 3589-3607
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Intercomparison of numerical atmospheric dispersion prediction models for emergency response to emissions of radionuclides with limited source information in the Fukushima Dai-ichi Nuclear Power Plant accident2019
Author(s)
Iwasaki, T., T. T. Sekiyama, T. Nakajima, A. Watanabe, Y. Suzuki, H. Kondo, Y. Morino, H. Terada, H. Nagai, M. Takigawa, H. Yamazawa, D. Quelo, A. Mathieu
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Journal Title
Atmospheric Environment
Volume: 214
Pages: 116830-116830
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Characterization of hydrocarbons in aerosols and investigation of biogenic sources as a carrier of radiocesium isotopes2018
Author(s)
Nakagawa, M., K. Yamada, S. Toyoda, K. Kita, Y. Igarashi, S. Komatsu, K. Yamada, R. Jun, and N. Yoshida
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Journal Title
GEOCHEMICAL JOURNAL
Volume: 52
Issue: 2
Pages: 163-172
DOI
NAID
ISSN
0016-7002, 1880-5973
Year and Date
2018-03-30
Related Report
Peer Reviewed
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[Journal Article] The seasonal variations of atmospheric 134,137Cs activity and possible host particles for their resuspension in the contaminated areas of Tsushima and Yamakiya, Fukushima, Japan2018
Author(s)
Takeshi Kinase, Kazuyuki Kita, Yasuhito Igarashi, Kouji Adachi, Kazuhiko Ninomiya, Atsushi Shinohara, Hiroshi Okochi, Hiroko Ogata, Masahide Ishizuka, Sakae Toyoda, Keita Yamada, Naohiro Yoshida, Yuji Zaizen, Masao Mikami, Hiroyuki Demizu, Yuichi Onda
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Journal Title
Progress in Earth and Planetary Science
Volume: 印刷中
Issue: 1
Pages: 12-12
DOI
NAID
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] Model depiction of the atmospheric flows of radioactive cesium emitted from the Fukushima Daiichi Nuclear Power Station accident2017
Author(s)
Nakajima T., Misawa S., Morino Y., Tsuruta H., Goto D., Uchida J., Takemura T., Ohara T., Oura Y., Ebihara M., Satoh M.
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Journal Title
Progress in Earth and Planetary Science
Volume: 4
Issue: 1
Pages: 1-18
DOI
Related Report
Peer Reviewed / Open Access / Acknowledgement Compliant
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[Journal Article] Cesium Uptake by Rice Roots Largely Depends Upon a Single Gene, HAK1, Which Encodes a Potassium Transporter.2017
Author(s)
Hiroki Rai, Saki Yokoyama, Namiko Satoh-Nagasawa, Jun Furukawa, Takiko Nomi, Yasuka Ito, Shigeto Fujimura, Hidekazu Takahashi, Ryuichiro Suzuki, ELMannai Yousra, Akitoshi Goto, Shinichi Fuji, Shin-ichi Nakamura, Takuro Shinano, Nobuhiro Nagasawa, Hiroetsu Wabiko, Hiroyuki Hattori.
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Journal Title
Plant and cell physiology
Volume: 58
Issue: 9
Pages: 1468-1493
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] 森林からのバイオエアロゾル放出フラックス推定とフィルタサンプリングされたバイオエアロゾルの蛍光測定の試み2019
Author(s)
北和之, 林菜穂, 南光太郎, 木村茉央, 佐々木完斉, 堅田元喜, 五十嵐康人, 反町篤行, 牧輝弥, 保坂健太郎, 古川純, 羽田野祐子, 池田 遼, 足立光司, 財前祐二, 川端康弘, 大河内博, 河村公隆, 石塚正秀, 斎藤保典
Organizer
第12回バイオエアロゾルシンポジウム
Related Report
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[Presentation] Increase of atmospheric concentration of radioactive cesium with bio-aerosols in a polluted area in Fukushima2018
Author(s)
K. Kita, N. Hayashi, K. Minami, M. Kimura, Y. Igarashi, K. Adachi, T. Maki, M. Ishizuka, H. Okochi, J. Furukawa, K. Hosaka, K. Ninomiya and A. Shinohara
Organizer
日本地球惑星科学連合2018年大会
Related Report
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[Presentation] Bioaerosol emission and its role in re-emission of radioactive cesium from forest in Fukushima2018
Author(s)
K. Kita, N. Hayashi, K. Minami, M. Kimura, Y. Igarashi, K. Adachi, T. Maki, M. Ishizuka, H. Okochi, J. Furukawa, K.Hosaka, K. Ninomiya and A. Shinohara
Organizer
2018 joint 14th iCACGP Quadrennial Symposium/15th IGAC Science Conference
Related Report
Int'l Joint Research
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[Presentation] Aerosol Emission from Forest by Precipitation: New Perspective for Atmosphere-Forest Interaction2018
Author(s)
Yasuhito Igarashi, Naho Hayashi, Kazuyuki Kita, Teruya Maki, Yasunori Saito, Hiroshi Okochi, Kentaro Hosaka, Kouichi Shiraishi, Takayuki Tomida, Kouji Adachi, Yuji Zaizen, Masahide Ishizuka, Atsuyuki Sorimachi
Organizer
第11回大気バイオエアロゾルシンポジウム
Related Report
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[Presentation] Bioaerosols sampled in Fukushima mountainous region and contribution to the radio-cesium resuspension2017
Author(s)
K. Kita, N. Hayashi, K. Minami, M. Kimura, Y. Igarashi, K. Adachi, T. Maki, M. Ishiduka H. Ohkochi, J. Furukawa, K. Ninomiya, and A. Shinohara
Organizer
2017 Symposium on atmospheric chemistry and physics at mountain sites (ACPM2017)
Related Report
Int'l Joint Research
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[Presentation] Temperate forest as big bioaerosol sources?: Implication from atmospheric Fukushima radiocesium studies2017
Author(s)
Y. Igarashi, K. Kita, T. Maki, T. Kinase, N. Hayashi, K. Adachi, C. Takenaka, M. Kajino, M. Ishizuka, T. T. Sekiyama, Y. Zaizen, K. Ninomiya, H. Okochi, A. Sorimachi
Organizer
2017 Symposium on atmospheric chemistry and physics at mountain sites (ACPM2017)
Related Report
Int'l Joint Research
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[Presentation] Atmospheric re-suspension mechanism of radio-cesium - possibility of circulation between atmosphere and biosphere2017
Author(s)
K.Kita, N.Hayashi, K.Minami, Y.Igarashi, K.Adachi, T.Maki, M.Ishiduka, H.Ohkochi, J.Furukawa, K.Ninomiya,and A.Shinohara
Organizer
2nd International Symposium of Quantum Beam Science at Ibaraki University
Related Report
Int'l Joint Research
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[Presentation] 大気モデル相互比較に基づく福島原発事故起源の137Csの動態解析2017
Author(s)
森野悠, 北山響, 滝川雅之, 中島映至, 速水洋, 永井晴康, 寺田宏明, 斉藤和雄, 新堀敏基, 梶野瑞王, 関山剛, Damien Didier, Anne Mathieu, 大原利眞, 鶴田治雄, 海老原充, 大浦泰嗣, 柴田徳思
Organizer
日本気象学会2017年度春季大会
Related Report
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