Leachability of Cesium from Cemented Evaporator Concentrates and Ion-Exchange Resins

摘要

Leachabilities of cesium from cemented evaporator concentrates and ion-exchange resins were measured. The standard draft of the International Organization for Standardization (ISO, 1979) for long-term leach testing was followed in the research. Three resin concretes and three concentrate concretes were tested. Deionized water and ground water were used as leachants. The leaching temperature was 20-23 deg C. The incremental leach rate at the end of the three and a half year test varied between 5 x 10 exp -12 - 15 x 10 exp -12 m/s and the cumulative activity fraction leached between 1.5 x 10 exp -3 - 6 x 10 exp -3 m. The apparent diffusion coefficients in ground water varied between 10 exp -9 - 10 exp -8 m/day. Because of the cracking the specimens cannot, however, be regarded as whole blocks, but the effects of cracking should be taken into account. (Atomindex citation 16:072388)