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Meguro, Yoshihiro; Kato, Jun; Kishimoto, Katsumi; Kameo, Yutaka; Ishimori, Kenichiro; Tanaka, Kiwamu; Shibata, Atsuhiro; Koma, Yoshikazu; Ashida, Takashi
no journal, ,
The authors are working in study for radioactive wastes generated in Fukushima Daiichi. Radioactive inventory estimation of wastes is important in the study for the processing and disposal of radioactive waste. And then so many real wastes have to be analyzed for their inventory evaluation. In addition to this waste analysis, there are several needs for analysis. For example a large volume of the contaminated water is being decontaminated, and operational status and ability of this system should be checked by analysis of the treated water. And also groundwater and sea water are analyzing to understand contaminated situation, to estimate a leakage position, and to confirm leakage prevention. In future fuel debris will be analyzed for its material accountancy. In this presentation, actual situation of analyses in Fukushima Daiichi will be explained, mainly focus on analyses for the inventory evaluation of the radioactive waste.
Onuki, Toshihiko; Masaki, Shota*; Utsunomiya, Satoshi*; Tanaka, Kazuya*; Yu, Q.; Kozai, Naofumi; Sakamoto, Fuminori; Saito, Takumi
no journal, ,
Some low-molecular-mass organic species released from the yeast after exposure to CeNPs. Although the CeNPs did not cause cytotoxicity, the organic species enhaced solubility of Ce nano particles. Formation of Ce nano-particles on the cell surface suppressed the oxidation of trivalent Ce to tetravalent Ce by Mn oxides.
Saito, Takumi; Murota, Kento*
no journal, ,
Long-term behavior of radioactive cesium (
Cs) in soils is of great concern in radiation protection and storage and disposal of excavated soils in heavily contaminated areas by the accident of the Fukushima Daiichi Nuclear Plant (F1 NPP). Although a large number of research on the fixation of Cs in soils have been performed since the Chernobyl accident, long-term release behaviors of Cs from contaminated soils are relatively unknown, partly because the apparent strong uptake of Cs by micaceous minerals in soils, which leads to a static picture of its behavior in soils. This study tires to pose a question on this issue by statistically evaluating geochemical and size distribution of Cs in even Fukushima soils and performing long-term extraction experiments at the so-called "infinite bath" condition.