Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant - IN2P3 - Institut national de physique nucléaire et de physique des particules
Article Dans Une Revue Scientific Reports Année : 2017

Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant

Junpei Imoto
  • Fonction : Auteur
Asumi Ochiai
  • Fonction : Auteur
Genki Furuki
  • Fonction : Auteur
Mizuki Suetake
  • Fonction : Auteur
Ryohei Ikehara
  • Fonction : Auteur
Kenji Horie
  • Fonction : Auteur
Mami Takehara
  • Fonction : Auteur
Shinya Yamasaki
  • Fonction : Auteur
Kenji Nanba
  • Fonction : Auteur
Toshihiko Ohnuki
  • Fonction : Auteur
Gareth Law
  • Fonction : Auteur
Bernd Grambow
Rodney Ewing
  • Fonction : Auteur
Satoshi Utsunomiya
  • Fonction : Auteur

Résumé

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.

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Radiochimie
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in2p3-01700243 , version 1 (27-05-2024)

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Junpei Imoto, Asumi Ochiai, Genki Furuki, Mizuki Suetake, Ryohei Ikehara, et al.. Isotopic signature and nano-texture of cesium-rich micro-particles: Release of uranium and fission products from the Fukushima Daiichi Nuclear Power Plant. Scientific Reports, 2017, 7, pp.5409. ⟨10.1038/s41598-017-05910-z⟩. ⟨in2p3-01700243⟩
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