Abstract
Release and migration of 90Sr and 137Cs from nepheline syenitebased glass buried since 1960 below the water table in sandy soil at Chalk River have been predicted by models using laboratory glass leaching data. Model predications of 90Sr release and migration show good agreement with field measurements. 137Cs concentration profiles in the soil suggest that a simple equilibrium ion exchange model is inadequate to predict 137Cs migration under present test conditions. Soil matrix support of a friable, corrosion-product layer is believed to be largely responsible for observed glass leach rates of the order of 8 x 10−14kg/m2.s after exposure to groundwater for 17 years.
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