Abundance and distribution of radioactive cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant into the environment

Ryohei Ikehara, Kazuya Morooka, Mizuki Suetake, Tatsuki Komiya, Eitaro Kurihara, Masato Takehara, Ryu Takami, Chiaki Kino, Kenji Horie, Mami Takehara, Shinya Yamasaki, Toshihiko Ohnuki, Gareth T.W. Law, William Bower, Bernd Grambow, Rodney C. Ewing, Satoshi Utsunomiya

研究成果: ジャーナルへの寄稿記事

抄録

The abundance and distribution of highly radioactive cesium-rich microparticles (CsMPs) that were released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) during the first stage of the nuclear disaster in March 2011 are described for 20 surface soils collected around the FDNPP. Based on the spatial distribution of the numbers (particles/g) and radioactive fraction (RF) of the CsMPs in surface soil, which is defined as the sum of the CsMP radioactivity (in Bq) divided by the total radioactivity (in Bq) of the soil sample, three regions of particular interest have been identified: i.) near-northwest (N-NW), ii.) far-northwest (F-NW), and iii.) southwest (SW). In these areas, the number and RF of CsMPs were determined to be 22.1–101 particles/g and 15.4–34.0%, 24.3–64.8 particles/g and 36.7–37.4%, and 0.869–8.00 particles/g and 27.6–80.2%, respectively. These distributions are consistent with the plume trajectories of material released from the FDNPP on March 14, 2011, in the late afternoon through to the late afternoon of March 15, 2011, indicating that the CsMPs formed only during this short period. Unit 3 is the most plausible source of the CsMPs at the beginning of the release based on an analysis of the sequence of release events. The lower RF values in the N-NW region indicate a larger influence from subsequent plumes that mainly consisted of soluble Cs species formed simultaneously with precipitation. The quantitative map of the distribution of CsMPs provides an important understanding of CsMP dispersion dynamics and can be used to assess risks in inhabited regions.

元の言語英語
記事番号125019
ジャーナルChemosphere
241
DOI
出版物ステータス出版済み - 2 2020

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Nuclear Power Plants
Cesium
cesium
nuclear power plant
Nuclear power plants
Soil
Radioactivity
Soils
radioactivity
soil surface
plume
distribution
Disasters
Spatial distribution
Sequence Analysis
disaster
trajectory
Trajectories
spatial distribution
particle

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Environmental Chemistry
  • Chemistry(all)
  • Pollution
  • Health, Toxicology and Mutagenesis

これを引用

Abundance and distribution of radioactive cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant into the environment. / Ikehara, Ryohei; Morooka, Kazuya; Suetake, Mizuki; Komiya, Tatsuki; Kurihara, Eitaro; Takehara, Masato; Takami, Ryu; Kino, Chiaki; Horie, Kenji; Takehara, Mami; Yamasaki, Shinya; Ohnuki, Toshihiko; Law, Gareth T.W.; Bower, William; Grambow, Bernd; Ewing, Rodney C.; Utsunomiya, Satoshi.

:: Chemosphere, 巻 241, 125019, 02.2020.

研究成果: ジャーナルへの寄稿記事

Ikehara, R, Morooka, K, Suetake, M, Komiya, T, Kurihara, E, Takehara, M, Takami, R, Kino, C, Horie, K, Takehara, M, Yamasaki, S, Ohnuki, T, Law, GTW, Bower, W, Grambow, B, Ewing, RC & Utsunomiya, S 2020, 'Abundance and distribution of radioactive cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant into the environment', Chemosphere, 巻. 241, 125019. https://doi.org/10.1016/j.chemosphere.2019.125019
Ikehara, Ryohei ; Morooka, Kazuya ; Suetake, Mizuki ; Komiya, Tatsuki ; Kurihara, Eitaro ; Takehara, Masato ; Takami, Ryu ; Kino, Chiaki ; Horie, Kenji ; Takehara, Mami ; Yamasaki, Shinya ; Ohnuki, Toshihiko ; Law, Gareth T.W. ; Bower, William ; Grambow, Bernd ; Ewing, Rodney C. ; Utsunomiya, Satoshi. / Abundance and distribution of radioactive cesium-rich microparticles released from the Fukushima Daiichi Nuclear Power Plant into the environment. :: Chemosphere. 2020 ; 巻 241.
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abstract = "The abundance and distribution of highly radioactive cesium-rich microparticles (CsMPs) that were released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) during the first stage of the nuclear disaster in March 2011 are described for 20 surface soils collected around the FDNPP. Based on the spatial distribution of the numbers (particles/g) and radioactive fraction (RF) of the CsMPs in surface soil, which is defined as the sum of the CsMP radioactivity (in Bq) divided by the total radioactivity (in Bq) of the soil sample, three regions of particular interest have been identified: i.) near-northwest (N-NW), ii.) far-northwest (F-NW), and iii.) southwest (SW). In these areas, the number and RF of CsMPs were determined to be 22.1–101 particles/g and 15.4–34.0{\%}, 24.3–64.8 particles/g and 36.7–37.4{\%}, and 0.869–8.00 particles/g and 27.6–80.2{\%}, respectively. These distributions are consistent with the plume trajectories of material released from the FDNPP on March 14, 2011, in the late afternoon through to the late afternoon of March 15, 2011, indicating that the CsMPs formed only during this short period. Unit 3 is the most plausible source of the CsMPs at the beginning of the release based on an analysis of the sequence of release events. The lower RF values in the N-NW region indicate a larger influence from subsequent plumes that mainly consisted of soluble Cs species formed simultaneously with precipitation. The quantitative map of the distribution of CsMPs provides an important understanding of CsMP dispersion dynamics and can be used to assess risks in inhabited regions.",
author = "Ryohei Ikehara and Kazuya Morooka and Mizuki Suetake and Tatsuki Komiya and Eitaro Kurihara and Masato Takehara and Ryu Takami and Chiaki Kino and Kenji Horie and Mami Takehara and Shinya Yamasaki and Toshihiko Ohnuki and Law, {Gareth T.W.} and William Bower and Bernd Grambow and Ewing, {Rodney C.} and Satoshi Utsunomiya",
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AU - Ikehara, Ryohei

AU - Morooka, Kazuya

AU - Suetake, Mizuki

AU - Komiya, Tatsuki

AU - Kurihara, Eitaro

AU - Takehara, Masato

AU - Takami, Ryu

AU - Kino, Chiaki

AU - Horie, Kenji

AU - Takehara, Mami

AU - Yamasaki, Shinya

AU - Ohnuki, Toshihiko

AU - Law, Gareth T.W.

AU - Bower, William

AU - Grambow, Bernd

AU - Ewing, Rodney C.

AU - Utsunomiya, Satoshi

PY - 2020/2

Y1 - 2020/2

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