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Journal Articles

Key factors controlling radiocesium sorption and fixation in river sediments around the Fukushima Daiichi Nuclear Power Plant, 2; Sorption and fixation behaviors and their relationship to sediment properties

Tachi, Yukio; Sato, Tomofumi*; Takeda, Chizuko*; Ishidera, Takamitsu; Fujiwara, Kenso; Iijima, Kazuki

Science of the Total Environment, 724, p.138097_1 - 138097_10, 2020/07

https://doi.org/10.1016/j.scitotenv.2020.138097
 Times Cited Count：9 Percentile：43.42(Environmental Sciences)

To understand and predict radiocesium transport behaviors in the environment, sorption and fixation behaviors of radiocesium on river sediments from Ukedo and Odaka rivers around the Fukushima Daiichi Nuclear Power Plant were investigated systematically focusing on Cs sorption and fixation mechanisms and their relationship with Cs concentrations and sediment properties including clay mineralogy and organic matter.

Journal Articles

Matrix diffusion and sorption of Cs$$^{+}$$, Na$$^{+}$$, I$$^{-}$$ and HTO in granodiorite; Laboratory-scale results and their extrapolation to the in situ condition

Tachi, Yukio; Ebina, Takanori*; Takeda, Chizuko*; Saito, Toshihiko*; Takahashi, Hiroaki*; Ouchi, Yuji*; Martin, A. J.*

Journal of Contaminant Hydrology, 179, p.10 - 24, 2015/08

https://doi.org/10.1016/j.jconhyd.2015.05.003
 Times Cited Count：29 Percentile：73.48(Environmental Sciences)

Matrix diffusion and sorption are important processes in the assessment of radionuclide transport in crystalline rocks. Diffusion and sorption parameters for Cs$$^{+}$$, Na$$^{+}$$, I$$^{-}$$ and HTO were determined by through-diffusion and batch sorption experiments using granodiorite samples from the Grimsel Test Site, Switzerland. The De values were in the order Cs$$^{+}$$, Na$$^{+}$$, HTO, I$$^{-}$$. The capacity factor and Kd values show the same trends. The dual depth profiles for Cs$$^{+}$$ and Na$$^{+}$$ can be interpreted by a near-surface Kd increment. The microscopic analysis indicated that this is caused by high porosity and sorption capacities in disturbed biotite minerals on the sample surface. The Kd values derived from the dual profiles are likely to correspond to Kd dependence on the grain sizes of crushed samples in the batch experiments. The results of the in situ LTD experiments were interpreted reasonably well by using transport parameters derived from laboratory data and extrapolating them to in situ conditions.

Oral presentation

Sorption and desorption of radiocesium to river soils, 2; Sorption and desorption measurement

Tachi, Yukio; Sato, Tomofumi; Terashima, Motoki; Takeda, Chizuko*; Fujiwara, Kenso; Iijima, Kazuki

no journal, , 

To predict the transport behaviors of radiocesium in river systems around the Fukushima Dai-ichi Nuclear Power Plant, the sorption and desorption of Cs on various types of river soils was investigated as functions of Cs concentration and reaction time. The key factors controlling the Cs transport were discussed based on types of clay minerals, organics, sorption kinetics, etc.

Oral presentation

Development of inventory evaluation methods for the radioactive wastes of Fukushima Daiichi Nuclear Power Station, 8; Evaluation of distribution coefficient of radionuclides on zeolite

Ishidera, Takamitsu; Tachi, Yukio; Ashida, Takashi; Ishii, Tomoko*; Akagi, Yosuke*; Takeda, Chizuko*

no journal, , 

no abstracts in English

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