Characterization of two types of cesium-bearing microparticles emitted from the Fukushima accident via multiple synchrotron radiation analyses.

Scientific Reports
Hikaru MiuraYoshio Takahashi

Abstract

A part of radiocesium emitted during the Fukushima nuclear accident was incorporated in glassy water-resistant microparticles, called Type-A particles, which are spherical with ~ 0.1 to 10 µm diameter and ~ 10-2 to 102 Bq cesium-137 (137Cs) radioactivity; they were emitted from Unit 2 or 3 of the Fukushima Daiichi Nuclear Power Plant. Meanwhile, Type-B particles, having various shapes, 50-400 µm diameter, and 101-104 Bq 137Cs radioactivity, were emitted from Unit 1. The chemical properties of these radioactive particles have been reported in detail, but previous studies investigated only a small number of particles, especially Type-B particles. We tried to understand radioactive particles systematically by analyzing a large number of particles. Micro-X-ray computed tomography combined with X-ray fluorescence analysis revealed the presence of many voids and iron-rich part within Type-B particles. The 137Cs concentration (Bq mm-3) of Type-A particles was ~ 10,000 times higher than that of Type-B particles. Among the Type-B particles, the spherical ones had higher concentration of volatile elements than the non-spherical ones. These differences suggested that Type-A particles were formed through gas condensation, whereas Type-B pa...Continue Reading

References

Apr 27, 2012·Environmental Science & Technology·Naoki KaneyasuFumikazu Ikemori
Aug 16, 2017·Analytical Chemistry·Chloë E BonamiciWilliam S Kinman
May 28, 2019·Journal of Environmental Radioactivity·Yasuhito IgarashiNoriko Yamaguchi

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Methods Mentioned

BETA
scanning electron microscopy
X-ray
backscattered electron imaging

Software Mentioned

ImageSurfer
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