JOPSS - Search Results

In support of the safety assessment of geologic disposal of high levcl radioactive wastes, the solubility of transuranium elements was studied. The solubility of PuO $_{2}$ xH $_{2}$ O was measured undcr a reducing condition, and the solubility product K $^{0}_{sp}$ and the stability constant $_{4}$ of Pu(OH) $_{4}$ were obtained. The obtained K $^{0}_{sp}$ value was found to be much smaller than that predicted by Rai et al. from its dependence on ionic radius. Also, the solubility of PuO $_{3}$ 3 xH $_{2}$ O was measured under an oxidizing condition and the solubility product K $^{0}_{sp}$ was obtained. In the analysis of hydrolysis constants of actinide ions, it was found that the systematic trend of the hydrolysis constants was well explained by the hard sphere model considering the effective charges of actinide ions.

JAEA Reports

JNC Thermodynamic Database for Performance Assessment of High-level Radioactive Waste Disposal System

Yui, Mikazu; ; Shibata, Masahiro

JNC TN8400 99-070, 106 Pages, 1999/11

JNC-TN8400-99-070.pdf:2.93MB

This report is a summary of status, frozen datasets, and future tasks of the JNC thermodynamic database (JNC-TDB) for assessing performance of high-level radioactive waste in geological environments. The JNC-TDB development was carried out after the first progress report on geological disposal research in Japan (H3). In the development, thermodynamic data (equilibrium constants at 25 $^{circ}$ C, I=0) for important radioactive elements were selected/determined based on original experimental data using different models (e.g., SIT, Pitzer). As a result, the reliability and traceability of the data for most of the important elements were improved over those of the PNC-TDB used in H-3 report. For detailed information of data analysis and selections for each element, see the JNC technical reports listed in this document.

Journal Articles

Vertical diffusion of coastal areas, 1; On the vertical diffusion of suspended particles from the sea bottom

Nihon Kaiyo Gakkai-Shi, 30(2), p.67 - 76, 1974/02

https://doi.org/10.1007/BF02112895

no abstracts in English

Oral presentation

Fundamental study toward mobility of radioactive elements in environment

Kusaka, Ryoji; Watanabe, Masayuki

no journal, ,

We aim to evaluate diffusion risk of various radioactive elements in the 1F contaminated water by clarifying their environmental mobility. In this study, we report a method that can relatively easily investigate mobility of radioactive elements using microspectroscopy in microscale experiment.

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Effect of humic acid on the bioavailability of radionuclides to rice plants

Adsorption of radionuclides on silica and their uptake by rice plants from silica-maltitracer solutions

Measurement of intrinsic radioactivity in a GSO crystal

None

None

None

Study on solubility of transuranium elements, II

JNC Thermodynamic Database for Performance Assessment of High-level Radioactive Waste Disposal System

Vertical diffusion of coastal areas, 1; On the vertical diffusion of suspended particles from the sea bottom

Fundamental study toward mobility of radioactive elements in environment