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Report No.
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Study on solubility and leaching property of Iodine-129 waste-forms for geological disposal

Ueta, Shinzo*; not registered; not registered; Muroi, Masayuki*; not registered; Izumi, Jun*; not registered

As concern the study on the property of Iodine-129 waste-forms, the solubilities of iodine-sodalite and tourmaline and leachabilities of hidroxy-apatite and fluoro-apatite were measured last year. The results in this year are summarized as follows. (1)Solubility and Leachability of lodine-sodalite were measured under the condition of Leachabilities and solubilities of the synthesized iodine-sodalite were measured by means of a long-term leach test in the solution with chloride ions and high pH (12.5). The measured solubilities were within a range of 10$$^{-5}$$ - 10$$^{-4}$$ M. It showed a tendency to increase with increasing temperature. The lieachabilities showed a tendency to decrease as time passed, and were within a range of 10$$^{-9}$$ - 10$$^{-8}$$ g/cm$$^{2}$$/d(10$$^{-6}$$ - 10$$^{-5}$$ m/y). After the leach test, the solid phases were analyzed and the alternation was not observed. It was confirmed by the experiments that the sodalite waste form had a certain capability to contain iodine even though the chloride ion existence. (2)Leaching property of high density apatite sample The following results were obtained by the manufacture examination of high density apatite sample and leaching experiments; (a)As a manufacture technology for apatite molding body, Plasma-hotpress technology was applied. To the porosity which aims 5%, the porosity of hydroxyapatite and fluoroapatite was under 2%. (b)Ca and P leaching concentration from hydroxyapatite reached 10$$^{-6}$$ M order, which was same order solubility estimated by PHREEQE code. From this test results, it was indicated that apatite material has a possibility for a waste of low-Leachability and high density performance.

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