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論文

The Formation mechanism of radiocesium-bearing microparticles derived from the Fukushima Daiichi Nuclear Power Plant using electron microscopy

萩原大樹; 近藤啓悦; 日高昭秀

Journal of Radioanalytical and Nuclear Chemistry, 331(12), p.5905 - 5914, 2022/12

https://doi.org/10.1007/s10967-022-08434-7

被引用回数：3 パーセンタイル：53.91(Chemistry, Analytical)

Radiocesium-bearing microparticles (CsMPs) were released from the Fukushima Daiichi Nuclear Power Plant during the 2011 accident. We examined the CsMP formation process by analyzing Type-A particles and conducting in situ glass fiber experiments. The results demonstrated that heating glass fibers to 450 $^{circ}$ C - 800 $^{circ}$ C formed spherical particles, their morphologies and elemental compositions were similar to those of actual CsMPs. The mock-up particles size was strongly dependent on the glass-fiber thickness. Our findings reveal that glass fibers can form microparticles after being exposed to high temperatures.

論文

Characterization of radiocesium-bearing microparticles with different morphologies in soil around the Fukushima Daiichi Nuclear Power Plant

萩原大樹; 舟木泰智; 尻引夏*; 菅野麻里奈*; 眞田幸尚

Journal of Radioanalytical and Nuclear Chemistry, 331(1), p.415 - 426, 2022/01

https://doi.org/10.1007/s10967-021-08061-8

被引用回数：7 パーセンタイル：65.59(Chemistry, Analytical)

Radiocesium-bearing microparticles (CsMPs) from Fukushima Daiichi Nuclear Power Plant (FDNPP) are observed in Eastern Japan. To examine their source and formation, multiple particles were isolated from soils from three sites around the FDNPP and their radioactivity, morphology, and elemental composition were analyzed. Cesium-137 radioactivity ranged from 0.23 to 8.57 Bq and particles were primarily composed of Si, Fe, Zn, C, and Cs at each site. Uranium-rich parts in certain CsMPs show their origin in the vicinity of the nuclear reactor. Our results will help characterize CsMPs and evaluate the internal dose exposure of personnel employed at the FDNPP

論文

Inner structure and inclusions in radiocesium-bearing microparticles emitted in the Fukushima Daiichi Nuclear Power Plant accident

奥村大河*; 山口紀子*; 土肥輝美; 飯島和毅; 小暮敏博*

Microscopy, 68(3), p.234 - 242, 2019/06

https://doi.org/10.1093/jmicro/dfz004

被引用回数：11 パーセンタイル：68.41(Microscopy)

2011年に起きた福島第一原子力発電所事故により環境中に放射性Cs含有微粒子(CsMP)が放出された。CsMPは事故時に原子炉内で形成されたため、その内部構造や組成は粒子形成時の炉内環境を反映していると考えられる。そこで本研究では、電子顕微鏡(TEM)を用いてCsMPの内部構造を調べた。その結果、いくつかのCsMPではZnやFe, Csが粒子内に不均一に分布していた。またCsMP内部に含有されたサブミクロンの結晶には2価鉄が含まれていたことから、CsMPがある程度還元的な雰囲気で形成されたことが示唆された。さらにCsMPにホウ素は含まれていないことがわかった。