Iron phosphate glass for immobilization of ⁹⁹Tc

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• 作者：Kai Xu ; Pavel Hrma ; Wooyong Um ; Jong Heo
• 刊名：Journal of Nuclear Materials
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：441
• 期：1-3
• 页码：262-266
• 全文大小：650 K

文摘

Technetium-99 (⁹⁹Tc) can bring serious environmental threats because of its long half-life (¦Ó_1/2 = ¡«2.1 ¡Á 10⁵ years), high fission yield (¡«6 % ), and high solubility and mobility in the ground water. The high volatility makes it difficult to immobilize ⁹⁹Tc in continuous melters vitrifying ⁹⁹Tc-containing nuclear wastes in borosilicate glasses. This work explores a possibility of incorporating a high concentration of ⁹⁹Tc, surrogated by the non-radioactive Re, in an iron phosphate glass by melting mixtures of iron phosphate glass frits with 1.5-6 mass % KReO₄ at ¡«1000 ¡ãC. The retention of Re achieved was ¡«1.1 mass % . The normalized Re release by the 7-day Product Consistency Test was <10^?2 g/m². Surprisingly, the Re escaped from the melt within a short time of heating, especially when the temperature was increased. Therefore, ⁹⁹Tc volatilization would still be a challenging task for its immobilization in iron phosphate glasses.