Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant
Abstract Highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) provide nano-scale chemical fingerprints of the 2011 tragedy. U, Cs, Ba, Rb, K, and Ca isotopic ratios were determined on three CsMPs (3.79–780 Bq) collected within ~10 km f...
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Nature Portfolio
2017
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oai:doaj.org-article:d1bcf202ae40471db6a0c5ad398e7b4c2021-12-02T11:41:21ZIsotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant10.1038/s41598-017-05910-z2045-2322https://doaj.org/article/d1bcf202ae40471db6a0c5ad398e7b4c2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05910-zhttps://doaj.org/toc/2045-2322Abstract Highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) provide nano-scale chemical fingerprints of the 2011 tragedy. U, Cs, Ba, Rb, K, and Ca isotopic ratios were determined on three CsMPs (3.79–780 Bq) collected within ~10 km from the FDNPP to determine the CsMPs’ origin and mechanism of formation. Apart from crystalline Fe-pollucite, CsFeSi2O6 · nH2O, CsMPs are comprised mainly of Zn–Fe-oxide nanoparticles in a SiO2 glass matrix (up to ~30 wt% of Cs and ~1 wt% of U mainly associated with Zn–Fe-oxide). The 235U/238U values in two CsMPs: 0.030 (±0.005) and 0.029 (±0.003), are consistent with that of enriched nuclear fuel. The values are higher than the average burnup estimated by the ORIGEN code and lower than non-irradiated fuel, suggesting non-uniform volatilization of U from melted fuels with different levels of burnup, followed by sorption onto Zn–Fe-oxides. The nano-scale texture and isotopic analyses provide a partial record of the chemical reactions that occurred in the fuel during meltdown. Also, the CsMPs were an important medium of transport for the released radionuclides in a respirable form.Junpei ImotoAsumi OchiaiGenki FurukiMizuki SuetakeRyohei IkeharaKenji HorieMami TakeharaShinya YamasakiKenji NanbaToshihiko OhnukiGareth T. W. LawBernd GrambowRodney C. EwingSatoshi UtsunomiyaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017) |
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Medicine R Science Q |
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Medicine R Science Q Junpei Imoto Asumi Ochiai Genki Furuki Mizuki Suetake Ryohei Ikehara Kenji Horie Mami Takehara Shinya Yamasaki Kenji Nanba Toshihiko Ohnuki Gareth T. W. Law Bernd Grambow Rodney C. Ewing Satoshi Utsunomiya Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| description |
Abstract Highly radioactive cesium-rich microparticles (CsMPs) released from the Fukushima Daiichi Nuclear Power Plant (FDNPP) provide nano-scale chemical fingerprints of the 2011 tragedy. U, Cs, Ba, Rb, K, and Ca isotopic ratios were determined on three CsMPs (3.79–780 Bq) collected within ~10 km from the FDNPP to determine the CsMPs’ origin and mechanism of formation. Apart from crystalline Fe-pollucite, CsFeSi2O6 · nH2O, CsMPs are comprised mainly of Zn–Fe-oxide nanoparticles in a SiO2 glass matrix (up to ~30 wt% of Cs and ~1 wt% of U mainly associated with Zn–Fe-oxide). The 235U/238U values in two CsMPs: 0.030 (±0.005) and 0.029 (±0.003), are consistent with that of enriched nuclear fuel. The values are higher than the average burnup estimated by the ORIGEN code and lower than non-irradiated fuel, suggesting non-uniform volatilization of U from melted fuels with different levels of burnup, followed by sorption onto Zn–Fe-oxides. The nano-scale texture and isotopic analyses provide a partial record of the chemical reactions that occurred in the fuel during meltdown. Also, the CsMPs were an important medium of transport for the released radionuclides in a respirable form. |
| format |
article |
| author |
Junpei Imoto Asumi Ochiai Genki Furuki Mizuki Suetake Ryohei Ikehara Kenji Horie Mami Takehara Shinya Yamasaki Kenji Nanba Toshihiko Ohnuki Gareth T. W. Law Bernd Grambow Rodney C. Ewing Satoshi Utsunomiya |
| author_facet |
Junpei Imoto Asumi Ochiai Genki Furuki Mizuki Suetake Ryohei Ikehara Kenji Horie Mami Takehara Shinya Yamasaki Kenji Nanba Toshihiko Ohnuki Gareth T. W. Law Bernd Grambow Rodney C. Ewing Satoshi Utsunomiya |
| author_sort |
Junpei Imoto |
| title |
Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| title_short |
Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| title_full |
Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| title_fullStr |
Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| title_full_unstemmed |
Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant |
| title_sort |
isotopic signature and nano-texture of cesium-rich micro-particles: release of uranium and fission products from the fukushima daiichi nuclear power plant |
| publisher |
Nature Portfolio |
| publishDate |
2017 |
| url |
https://doaj.org/article/d1bcf202ae40471db6a0c5ad398e7b4c |
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