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Irisawa, Ayumi*; Sakuma, Kazuyuki; Takeuchi, Yukio*; Taniguchi, Keisuke*; Onda, Yuichi*
KEK Proceedings 2023-2, p.29 - 33, 2023/11
no abstracts in English
Taniguchi, Keisuke*; Onda, Yuichi*; Smith, H. G.*; Blake, W.*; Yoshimura, Kazuya; Yamashiki, Yosuke*; Kuramoto, Takayuki*; Saito, Kimiaki
Environmental Science & Technology, 55(13), P. 9394, 2021/07
Times Cited Count：0 Percentile：0.24(Engineering, Environmental)no abstracts in English
Onda, Yuichi*; Taniguchi, Keisuke*; Yoshimura, Kazuya; Kato, Hiroaki*; Takahashi, Junko*; Wakiyama, Yoshifumi*; Coppin, F.*; Smith, H.*
Nature Reviews Earth & Environment (Internet), 1(12), p.644 - 660, 2020/12
Times Cited Count：88 Percentile：89.61(Environmental Sciences)Onda, Yuichi*; Taniguchi, Keisuke*; Yoshimura, Kazuya; Kato, Hiroaki*; Takahashi, Junko*; Wakiyama, Yoshifumi*; Coppin, F.*; Smith, H.*
Nature Reviews Earth & Environment (Internet), 1(12), P. 694_1, 2020/12
Times Cited Count：0 Percentile：0.26(Environmental Sciences)Taniguchi, Keisuke*; Onda, Yuichi*; Smith, H. G.*; Blake, W.*; Yoshimura, Kazuya; Yamashiki, Yosuke*; Kuramoto, Takayuki*
Scientific Data (Internet), 7, p.443_1 - 443_9, 2020/12
Times Cited Count：8 Percentile：45.54(Multidisciplinary Sciences)
Cs concentrations in east Japanese riversTsuji, Hideki*; Ishii, Yumiko*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; Lee, S*; et al.
Science of the Total Environment, 697, p.134093_1 - 134093_11, 2019/12
Times Cited Count：17 Percentile：59.38(Environmental Sciences)To investigate the main factors that control the dissolved radiocesium concentration in river water in the area affected by the Fukushima Daiichi Nuclear Power Plant accident, the correlations between the dissolved Cs concentrations at 66 sites normalized to the average Cs inventories for the watersheds with the land use, soil components, topography, and water quality factors were assessed. We found that the topographic wetness index is significantly and positively correlated with the normalized dissolved Cs concentration. Similar positive correlations have been found for European rivers because wetland areas with boggy organic soils that weakly retain Cs are mainly found on plains. However, for small Japanese river watersheds, the building area ratio in the watershed strongly affected the dissolved Cs concentration.
Taniguchi, Keisuke*; Onda, Yuichi*; Smith, H. G.*; Blake, W.*; Yoshimura, Kazuya; Yamashiki, Yosuke*; Kuramoto, Takayuki*; Saito, Kimiaki
Environmental Science & Technology, 53(21), p.12339 - 12347, 2019/11
Times Cited Count：73 Percentile：94.89(Engineering, Environmental)Kurihara, Momo*; Yasutaka, Tetsuo*; Aono, Tatsuo*; Ashikawa, Nobuo*; Ebina, Hiroyuki*; Iijima, Takeshi*; Ishimaru, Kei*; Kanai, Ramon*; Karube, Jinichi*; Konnai, Yae*; et al.
Journal of Radioanalytical and Nuclear Chemistry, 322(2), p.477 - 485, 2019/11
Times Cited Count：2 Percentile：21.58(Chemistry, Analytical)We assessed the repeatability and reproducibility of methods for determining low dissolved radiocesium concentrations in freshwater in Fukushima. Twenty-one laboratories pre-concentrated three of 10 L samples by five different pre-concentration methods (prussian-blue-impregnated filter cartridges, coprecipitation with ammonium phosphomolybdate, evaporation, solid-phase extraction disks, and ion-exchange resin columns), and activity of radiocesium was measured. The z-scores for all of the Cs results were within 
2, indicating that the methods were accurate. The relative standard deviations (RSDs) indicating the variability in the results from different laboratories were larger than the RSDs indicating the variability in the results from each separate laboratory.
Shibata, Masahiro; Sawada, Atsushi; Tachi, Yukio; Makino, Hitoshi; Hayano, Akira; Mitsui, Seiichiro; Taniguchi, Naoki; Oda, Chie; Kitamura, Akira; Osawa, Hideaki; et al.
JAEA-Research 2012-032, 298 Pages, 2012/09
JAEA-Research-2012-032.pdf:33.68MB
JAEA and NUMO have conducted a collaborative research work which is designed to enhance the methodology of repository design and performance assessment in preliminary investigation phase. The topics and the conducted research are follows; (1) Study on selection of host rock: in terms of hydraulic properties, items for assessing rock property, and assessment methodology of groundwater travel time has been organized with interaction from site investigation. (2) Study on development of scenario: the existing approach has been embodied, in addition, the phenomenological understanding regarding dissolution of and nuclide release from vitrified waste, corrosion of the overpack, long-term performance of the buffer are summarized. (3) Study on setting nuclide migration parameters: the approach for parameter setting has been improved for sorption and diffusion coefficient of buffer/rock, and applied and tested for parameter setting of key radionuclides. (4) Study on ensuring quality of knowledge: framework for ensuring quality of knowledge has been studied and examined aimed at the likely disposal facility condition.
Taniguchi, Keisuke*; Yoshimura, Kazuya; Smith, H.*; Blake, W.*; Yamamoto, Masayoshi*; Yokoyama, Akihiko*; Takahashi, Yoshio*; Sakaguchi, Aya*; Onda, Yuichi*
no journal, ,
no abstracts in English
Taniguchi, Keisuke*; Yoshimura, Kazuya; Smith, H.*; Blake, W.*; Takahashi, Yoshio*; Sakaguchi, Aya*; Yamamoto, Masayoshi*; Onda, Yuichi*
no journal, ,
no abstracts in English
Onda, Yuichi*; Taniguchi, Keisuke*; Smith, H.*; Blake, W.*; Yoshimura, Kazuya
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Onda, Yuichi*; Taniguchi, Keisuke*; Wakiyama, Yoshifumi*; Yoshimura, Kazuya; Smith, H.*; Blake, W.*; Iwagami, Sho*; Kato, Hiroaki*
no journal, ,
Taniguchi, Keisuke*; Kuramoto, Takayuki*; Onda, Yuichi*; Yoshimura, Kazuya
no journal, ,
no abstracts in English
Taniguchi, Keisuke*; Kuramoto, Takayuki*; Onda, Yuichi*; Yoshimura, Kazuya
no journal, ,
no abstracts in English
Onda, Yuichi*; Yoshimura, Kazuya; Taniguchi, Keisuke*; Kubo, Takaaki*; Smith, H.*; Blake, W.*; Kuramoto, Takayuki*; Sato, Takayuki*
no journal, ,
Taniguchi, Keisuke*; Kuramoto, Takayuki*; Onda, Yuichi*; Yoshimura, Kazuya; Arai, Hirotsugu*; Onuma, Saori*; Sato, Takayuki*
no journal, ,
no abstracts in English
Cs concentrations in Japanese riversTsuji, Hideki*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; Lee, S*; Shinano, Takuro*; et al.
no journal, ,
To predict the behavior of particulate and dissolved radiocesium (Cs) in river water, some soil and land use categories in the watershed should be considered because these may affect the dissolved Cs concentration. In this study, to investigate the factors that affect dissolved Cs concentrations in Japanese rivers, we measured dissolved Cs concentrations in 67 rivers under baseflow conditions 13-280 km from the Fukushima Daiichi Nuclear Power Plant in August and September 2017.
Cs concentrations in east Japanese riversTsuji, Hideki*; Ishii, Yumiko*; Hayashi, Seiji*; Shin, M.*; Taniguchi, Keisuke*; Arai, Hirotsugu*; Kurihara, Momo*; Yasutaka, Tetsuo*; Kuramoto, Takayuki*; Nakanishi, Takahiro; et al.
no journal, ,
Controlling factor of dissolved Cs concentrations in 66 in East Japan rivers was investigated. Dissolved Cs concentrations decreased by one order of magnitude between 2012 and 2017. Normalized dissolved Cs concentrations correlated well with building area ratios. Topographic wetness index generally predicted dissolved Cs concentrations. The high concentration of dissolved Cs in urban area cannot be explained by water quality condition.
Taniguchi, Keisuke*; Takeuchi, Yukio*; Fujita, Kazuki*; Dohi, Terumi; Hayashi, Seiji*; Kuramoto, Takayuki*; Nomura, Naoki*; Aono, Tatsuo*
no journal, ,
In Fukushima Prefecture, although decontamination has been completed except for difficult-to-return areas, most of the forest has not been decontaminated yet. From the forest, radiocaesium may enter rivers and affect downstream areas. A survey was conducted in three forested watersheds of the Nanokazawa, Saruta, Nuno rivers located in Fukushima Prefecture to understand the amount and characteristics of radiocaesium flowing out. In each watershed, suspended solids (SS) were collected by a suspended sand sampler, water was collected every few months, and the water level and flow rate were measured. After freeze-drying the SS sample, the concentration of suspended Cs-137 was measured by a germanium semiconductor detector. The water sample was filtered through a membrane filter with a pore size of 0.45 
m, then the dissolved Cs-137 was collected by the solid-phase extraction disk method or AMP coprecipitation method, and the dissolved Cs-137 concentration was measured by a germanium semiconductor detector. The ranges of dissolved Cs-137 concentration in FY2019 were 69-190 mBq/L in the Saruta River, 9.7-16 mBq/L in the Nanokazawa river, and ND-3.2 mBq/L in the Nuno River. In the poster, we will also present the results of SS measurements and flow observations.
