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Journal Articles

Influences of humid substances, alkaline conditions and colloids on radionuclide migration in natural barrier

Mukai, Masayuki; Ueda, Masato; Inada, Daisuke; Yukawa, Kazuhiko; Maeda, Toshikatsu; Iida, Yoshihisa

Proceedings of International Symposium NUCEF 2005, p.219 - 224, 2005/08

For better quantitative understanding of radionuclide migration for safety assessment of geologic disposal, JAERI has been conducting experimental and modeling studies on influences of humic substances, highly alkaline conditions and colloids on sorptive and diffusional behavior of TRU in geologic materials. In the absence of fulvic acid, one of humic substances, diffusion of Am through a tuff sample was not detected. By adding fulvic acid, Am was detected in the downstream cell, which indicates the diffusion through the sample. Highly alkaline conditions arisen from cementitious materials may spread by altering chemical and physical properties of geologic materials. Through-diffusion experiments of alkaline species in granite showed that the effective diffusion coefficient of Ca$$^{2+}$$ and OH$$^{-}$$ in a cement-equilibrated aqueous solution were found to be higher by almost two orders of magnitude than Na$$^{+}$$ and OH$$^{-}$$ in a NaOH solution. Radionuclide migration can be enhanced by colloids, and thus a calculation code describing the effect of colloids on radionuclide migration has been required.

Journal Articles

Association of Am with humic substances isolated from river waters with different water quality

Nagao, Seiya*; Fujitake, Nobuhide*; Kodama, Hideki*; Matsunaga, Takeshi; Yamazawa, Hiromi

Journal of Radioanalytical and Nuclear Chemistry, 255(3), p.459 - 464, 2003/03

 Times Cited Count:7 Percentile:47.54(Chemistry, Analytical)

no abstracts in English

Journal Articles

Molecular size distribution of Np, Pu and Am in organic rich, saline groundwater

Nagao, Seiya; Tanaka, Tadao; Nakaguchi, Yuzuru*; Suzuki, Yasuhiro*; Muraoka, Susumu; Hiraki, Keizo*

Understanding and Maraging Organic Matter in Soils, Sediments and Waters, p.525 - 532, 2001/00

no abstracts in English

Journal Articles

Characteristics of humic substances in a saline groundwater in Boso peninsula, Japan

Nagao, Seiya; Nakaguchi, Yuzuru*; Fujitake, Nobuhide*; Ogawa, Hiromichi

Proceedings of 10th International Meeting of the International Humic Substances Society (IHSS10), p.1143 - 1146, 2000/07

no abstracts in English

Journal Articles

Application of high-performance gel permeation chromatography to aquatic humic substances in natural waters

Nagao, Seiya;

Humic Substances and Organic Matter in soil and Water Environments: Characterization,Transformations, 0, p.71 - 79, 1996/00

no abstracts in English

Journal Articles

Characteristics of humic substances and TRU-humate complexes in groundwater

Nagao, Seiya

Hoshasei Haikibutsu Kenkyu, 1(2), p.231 - 242, 1995/05

no abstracts in English

Journal Articles

Possible complexation of uranium with dissolved humic substances in pore water of marine sediments

Nagao, Seiya*;

Science of the Total Environment, 117-118, p.439 - 447, 1992/00

no abstracts in English

Journal Articles

Major aqueous chlorination products of oxidized fulvic acid

; ;

Chem.Lett., 8, p.1435 - 1436, 1984/00

 Times Cited Count:10

no abstracts in English

JAEA Reports

A Study of the Experimental Method of Chlorine Treatment of Raw Drinking Water

; ; ;

JAERI-M 83-149, 50 Pages, 1983/09

JAERI-M-83-149.pdf:1.76MB

no abstracts in English

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