| 초록 |
BaSO4 waste powder containing a radioactive nuclide is generated from various processes such as chemical decontamination and radioactive liquid waste treatment. They must be immobilized into a stable form for final disposal. Hydraulic cement cannot be applied to wastes containing a high concentration of sulfate. Geopolymer can be used as a good binder, however, it has a low density. As an immobilization method using iron phosphate glass can be utilized. In this method, a great amount of SO2 gas is however emitted. In this study, immobilization of BaSO4 powder containing a radioactive nuclide surrogate was conducted to resolve these problems by a low temperature sintering using a low-melting glass. The BaSO4 powder was immobilized into a waste form with high density and compressive strength. Through leaching tests (PCT, ANS 16.1), it was confirmed that the waste form was chemically durable, and it met the acceptance criteria of the leachability index (≥ 6). |
