2020 Fall Meeting
Sep 16 - Sep 18, 2020Online
2020 Fall Meeting
Sep 16 - Sep 18, 2020Online
[1A05]A novel approach to distinguish radiocesium-carrying materials derived from the Fukushima nuclear accident
*Taiga Okumura1, Noriko Yamaguchi2, Toshihiro Kogure1(1. Univ. of Tokyo, 2. NARO)
Keywords:
Radiocesium-bearing microparticle,Mineral particle,Fukushima nuclear accident,Acid treatment,Dissolution property
Radiocesium (RCs)-carrying materials derived from the Fukushima nuclear accident consist of RCs-sorbing minerals (CsSMs) and RCs-bearing silicate-glass microparticles (CsMPs). We reveal that while acid treatment has little effect on CsMPs, it significantly decreases the radioactivity of CsSMs due to dissolution. Using this difference, we established a method employing autoradiography or γ-ray spectroscopy for estimating the contributions of CsMPs and CsSMs to the total radioactivity of contaminated materials. Distribution of CsMPs in samples can also be elucidated without time-consuming microscopic analysis.