Presentation Information
[2K08]Cesium-rich microparticle (CsMP): A window into the damaged reactors and its environmental impacts(12)“Invisible” radioactive cesium atoms revealed: Pollucite inclusion in cesium-rich microparticles (CsMPs) from the Fukushima Daiichi Nuclear Power Plant
*Kanako Miyazaki1, Kenji Horie2, Mami Takehara2, Shinya Yamasaki3, Takumi Saito4, Toshihiko Ohnuki5, Masahide Takano6, Hiroyuki Shiotsu6, Hajime Iwata6, Satoshi Utsunomiya1 (1. Kyushu Univ., 2. NIPR, 3. Univ. of Tsukuba, 4. UTokyo, 5. Tokyo Tech, 6. JAEA)
Keywords:
Cesium-rich microparticle,Radioactive cesium atom,Pollcite
We observed radioactive Cs atoms in Cesium-rich microparticle (CsMP) isolated from environmental samples by γ spectrometry, SEM, and TEM, as well as HAADF-STEM and multi-slice method image simulation. Three CsMPs contained particles with high concentrations of Cs (>27-36%) identified as pollcite, a type of zeolite.
The HAADF-STEM image observed from [111] shows a six-fold symmetric arrangement of Cs atoms, and the relative intensities are consistent with the simulated image. Considering that the concentrations of Ba and K in the same site are lower than those of Cs and that about 50% of the Cs isotopes are radioactive Cs isotopes, the Cs atoms observed in this image indicate radioactive Cs atoms, which is the first successful observation of radioactive Cs atoms.
The HAADF-STEM image observed from [111] shows a six-fold symmetric arrangement of Cs atoms, and the relative intensities are consistent with the simulated image. Considering that the concentrations of Ba and K in the same site are lower than those of Cs and that about 50% of the Cs isotopes are radioactive Cs isotopes, the Cs atoms observed in this image indicate radioactive Cs atoms, which is the first successful observation of radioactive Cs atoms.
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