Abstract
Crystal chemical stabilization of radioactive wastes can be achieved during clinkering of ordinary portland cement. Crys‐tallographic relations predict that the radionuclide partitioning in the anhydrous clinkered phases will be maintained in the hydration products. The resulting hydration products are considered to be cementitious hydroxylated radiophases. Simulated leaching experiments demonstrate that the hydroxylated phases are stable and that waste element release rates are lower than for other cementitious waste forms. The formation of tobermorite as a reaction product limits the release of cesium. Radionuclide fixation is described in the context of commercial waste‐cement systems, but is applicable to transuranic, medium‐ and low‐level wastes.
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