| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2012: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
Understanding of thermodynamic stability of actinide ions and its compounds including colloids is indispensable for safety assessment for the disposal of high level radioactive waste. In this project, basic studies in actinide aqueous solution chemistry have been performed to obtain the knowledge of formation constants, solubility products, and the chemical conditions of soluble species and precipitation. Through the systematic experimental study of the binary (An-OH) and the ternary (An-OH-inorganic ions, -humic substances) systems at a given solution condition, the apparent solubility data and the long term stability of species and solid phases were analyzed by the proposed thermodynamic models. The results are expected to contribute a reliability improvement of radioactive waste management in Japan and other countries.
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