Leachability of Radium-226 from Uranium Mill Solids and River Sediments

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Abstract
Laboratory leaching tests conducted on uranium mill waste solids and river sediments collected from several locations in the Colorado Plateau area of the United States have shown that the amount of radium-226 that can be leached is primarily controlled by the liquid-to-solid ratio (volume of leaching liquid per unit weight of solids). The diffusion of radium-226 from the interior to the surface of the particles was found to be insignificant since the amount leached was essentially independent of time of contact after 15 min. Natural and synthetic river waters showed no greater tendency to leach radium-226 than did distilled water. Leaching tests conducted with 0.01 molar solutions of the common inorganic cations found in river waters showed that only barium significantly promoted the leaching of radium-226 from the solids studied.

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