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Journal Articles

Sorption of Cs$$^{+}$$ and Eu$$^{3+}$$ onto coherent and melange-type pre-neogene sedimentary rocks

Hou, L.*; Toda, Kanako*; Mei, H.; Aoyagi, Noboru; Saito, Takumi*

Journal of Nuclear Science and Technology, 61(11), p.1488 - 1498, 2024/11

 Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)

Journal Articles

Application of diffusive gradients in thin films (DGT) for the dynamic speciation of radioactive cesium in Fukushima Prefecture, Japan

Tanaka, Takuro*; Fukuoka, Masafumi*; Toda, Kanako*; Nakanishi, Takahiro; Terashima, Motoki; Fujiwara, Kenso; Niwano, Yuma*; Kato, Hiroaki*; Kobayashi, Natsuko*; Tanoi, Keitaro*; et al.

ACS ES&T Water (Internet), 4(8), p.3579 - 3586, 2024/08

Oral presentation

Classification and ion complexation properties of natural organic matters in deep groundwater using fluorescence spectroscopy and multivariate analysis

Saito, Takumi*; Nishi, Shusaku*; Toda, Kanako*; Miyakawa, Kazuya; Amano, Yuki

no journal, , 

no abstracts in English

Oral presentation

Evaluation of labile $$^{137}$$Cs in Fukushima rivers by diffusive gradients in thin films (DGT), 3; Relations between geochemical parameters

Tanaka, Takuro*; Saito, Takumi*; Toda, Kanako*; Fujiwara, Kenso; Terashima, Motoki; Nakanishi, Takahiro; Kobayashi, Natsuko*; Tanoi, Keitaro*; Kato, Hiroaki*

no journal, , 

$$^{137}$$Cs dispersed by the Fukushima Daiichi Nuclear Power Plant accident deposited in Fukushima area, that are not decontaminated in mountainous areas, may migrate through river water to animals and plants. Most of $$^{137}$$Cs in river are fixed in clay minerals, but there are some Cs that can be easily desorbed, named as labile components. It has been suggested that labile components affect the bioavailability of $$^{137}$$Cs. In this study, the labile $$^{137}$$Cs was sampled in situ from upstream to downstream in several rivers of Fukushima using a passive sampler called diffusive gradients in thin films (DGT). The desorption behavior of the labile component and factors affecting it will be discussed by examining the relationship with particulate $$^{137}$$Cs and geochemical parameters in river water.

Oral presentation

Evaluation of labile Cs-137 in Fukushima rivers by diffusive gradients in thin films (DGT, 2; Examination in river basins

Tanaka, Takuro*; Saito, Takumi*; Toda, Kanako*; Fujiwara, Kenso; Terashima, Motoki; Nakanishi, Takahiro; Kobayashi, Natsuko*; Tanoi, Keitaro*

no journal, , 

Cs-137 dispersed by the Fukushima Daiichi Nuclear Power Plant accident deposited in Fukushima area, that are not decontaminated in mountainous areas, may migrate through river water to animals and plants. Most of Cs-137 in river are fixed in clay minerals, but there are some Cs that can be easily desorbed, named as labile components. It has been suggested that labile components affect the bioavailability of Cs-137. In this study, the labile Cs-137 was sampled in situ from upstream to downstream in several rivers of Fukushima using a passive sampler called diffusive gradients in thin films (DGT). Sampling was conducted at a different season in addition to the previous studies.

Oral presentation

Diffusion of Cs, I, and HDO in a pre-Neogene sedimentary rock

Hou, L.*; Toda, Kanako*; Fukatsu, Yuta; Ishidera, Takamitsu; Saito, Takumi*

no journal, , 

Oral presentation

Influence of heterogeneity on ions and HDO diffusion in pre-Neogene sedimentary rocks

Hou, L.*; Okamoto, Shunichi*; Toda, Kanako*; Fukatsu, Yuta; Ishidera, Takamitsu; Saito, Takumi*

no journal, , 

Oral presentation

Evaluation of the interaction between deep groundwater natural organic matter and metal ions using fluorescence spectroscopy and multivariate analysis and arrangement of their origins

Nishi, Shusaku*; Miyakawa, Kazuya; Toda, Kanako*; Saito, Takumi*

no journal, , 

In HLW disposal, NOM changes radionuclides behavior. For surface NOM, models that express bonding with metal ions under various conditions have been proposed. To use such models in the safety evaluation of geological disposal, binding reactions between NOM in deep underground and nuclides are evaluated, and features are compared with the NOM in surface. In March 2021, we focused on the fact that NOM fluorescence is extinguished by combining with metal ions, and conducted quenching experiments where europium was added to the deep groundwater containing NOM. Using PARAFAC, a multivariate analysis method, fluorescent NOM components that contribute to binding are identified, and properties and reactivity with europium are discussed. In this presentation, new samples are added for more comprehensive discussions.

Oral presentation

Molecular characterization of reactive deep underground dissolved organic matters for metal ion using high-resolution mass spectrometry

Sato, Hayato*; Toda, Kanako*; Beppu, Hikari*; Amano, Yuki; Miyakawa, Kazuya; Saito, Takumi*

no journal, , 

no abstracts in English

Oral presentation

Molecular characterization of reactive deep underground dissolved organic matters for metal ion using fluorescence spectroscopy and high-resolution mass spectrometry

Sato, Hayato*; Toda, Kanako*; Beppu, Hikari*; Amano, Yuki; Miyakawa, Kazuya; Saito, Takumi*

no journal, , 

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