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Journal Articles

Overview of environmental impact assessment studies on radioactive contamination after the Fukushima Daiichi Nuclear Power Plant accident

Iijima, Kazuki; Hayashi, Seiji*; Tamaoki, Masanori*

Global Environmental Research (Internet), 24(2), p.85 - 93, 2021/06

Environmental radioactive contamination by the Fukushima Daiichi Nuclear Power Plant accident has clearly been declining during the passage of almost 10 years from the accident. However, the prolongation of radioactive contamination in natural ecosystems probably derived from forested area without decontamination is pointed out by many studies, so more detailed examination will be needed for environmental dynamics of bioavailable radiocesium and its transfer to ecosystems. Also for influence of radiation to organisms, effects of evacuation on wild organisms are more pronounced than direct effect from radiation, especially in Fukushima evacuation area.

Journal Articles

Equipment of model template for a code predicting the migration of ground additions, MOGRA

Takahashi, Tomoyuki*; Amano, Hikaru; Uchida, Shigeo*; Ikeda, Hiroshi*; Matsuoka, Shungo*; Hayashi, Hiroko*; Kurosawa, Naohiro*

Kankyo Eisei Kogaku Kenkyu, 17(3), p.340 - 344, 2003/07

no abstracts in English

Journal Articles

Diversity of complex systems produced by a class of cellular automata

Suzudo, Tomoaki

Proceedings of 6th International Conference on Complex Systems (CS02), p.77 - 81, 2002/09

no abstracts in English

Journal Articles

Estimation of $^{14}$ CO $_{2}$ flux at soil-atmosphere interface and distribution of $^{14}$ C in forest ecosystem

Koarashi, Jun; Amano, Hikaru; Atarashi-Andoh, Mariko; Iida, Takao*; Moriizumi, Jun*

Journal of Environmental Radioactivity, 60(3), p.249 - 261, 2002/06

https://doi.org/10.1016/S0265-931X(01)00084-4

Times Cited Count：15 Percentile：34.15(Environmental Sciences)

no abstracts in English

Journal Articles

Radioactive contamination in the aquatic environment as a result of the Chernobyl nuclear accident

Matsunaga, Takeshi; Nagao, Seiya*

Sui Kankyo Gakkai-Shi, 25(4), p.193 - 197, 2002/04

https://doi.org/10.2965/jswe.25.226

no abstracts in English

Journal Articles

Risk management and human; Toward ecological interface beyond automatization and procedurization

Tanabe, Fumiya

SCIaS, 5(3), p.22 - 23, 2000/03

no abstracts in English

JAEA Reports

Influence of naturally-occurring heterogeneous complex-forming materials on the migration behavior of actinides in the geosphere (III)

Tochiyama, Osamu*

JNC TJ8400 2000-044, 53 Pages, 2000/02

JNC-TJ8400-2000-044.pdf:1.41MB

To estimate the polyelectrolyte effect and the effect of the heterogeneous composition of humic acids, the complex formation constants of Eu(III) and Ca(II) with Aldrich humic acid and polyacrylic acid were obtained, for Eu(10 $^{-8}$ to 10 $^{-5}$ M) by solvent extraction with TTA and TBP in xylene, for Ca (10 $^{-10}$ M) with TTA and TOPO in cyclohexane and for Ca(10 $^{-4}$ M) by using ion-selective electrode. By defining the apparent formation as $beta_{alpha}$ = [MR $_{m}$ ]/([M][R]), where [R] denotes the concentration of dissociated functional group, [M] and [MR $_{m}$ ] denote the concentration of free and bound metal ion and pcH is defined as-log[H], the values of log $beta_{alpha}$ have been obtained at pcH 4.8 - 5.5 in 0.1 - 1.0M NaClO $_{4}$ and NaCl. Log $beta_{alpha}$ of Eu-humate varied from 5.0 to 9.3 and that of Ca-humate from 2.0 to 3.4..For both humate and polyacrylate, log $beta_{alpha}$ increased with pcH or with the degree of dissociation. The increase in the ionic strength O.1 to 1.0 M decreased the log $beta_{alpha}$ , the decrease in log $beta_{alpha}$ of Eu(III)-humate is 1.6, that of Eu(III), polyacrylate 0.7, that of Ca(II)-humate 1.9 and that of Ca(II)-polyacrylate 1.2. While the increase in the metal ion produced no effect on log $beta_{alpha}$ of polyacrylate, log $beta_{alpha}$ of humate decreased. Depending on the concentration of Eu(III), the coexistence of Ca(II) reduced log $beta_{alpha}$ of humate by 0 to 0.8. The dependence of log $beta_{alpha}$ of humate on the metal ion concentration suggests the coexistence of strong and weak binding sites in the hmnic acid.