Abstract
Carbon-14 releases from unsolidified and solidified IRN-150 ion exchange resin wastes have been investigated to determine the matrix with the lowest leaching rates. After ninety-three days leaching, 14C cumulative releases from Portland Type 30 cement/epoxy resin matrix were lower than the releases from unsolidified ion exchange resins and those solidified with water extendible polyester polymer. Long-term 14C releases from the waste forms were estimated by a semi-infinite diffusion model that accounts for diffusion and non-diffusion controlled processes. The diffusivity coefficients calculated by this model ranged from 1.2 × 10 −13 cm 2/s to 7.3 × 10 −13 cm 2/s for Portland Type 30 cement/epoxy resin waste products and from 1.0 × 1.0 −10 cm 2/s to 8.0 × 10 -15 cm 2/s for water extendible polyester samples. After five hundred years leaching 14C releases are estimated at 6.5% for Portland Type 30 cement/epoxy resin samples. In the case of water extendible polyester waste forms, the data show all original radioactivity would be released by the end of this leaching period.
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