Effect of Moisture Content on Radon Emanation from Uranium Ore and Tailings

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Abstract
The effect of moisture on the emanation coefficient and Rd flux from Ur mill tailings was studied. A sharp rise in emanation coefficient occurred as the moisture content was increased from the absolutely dry state to 2% water by weight. The emanation coefficients from water-saturated tailings were .apprx. 4-fold those from absolutely dry materials. Rd flux was measured from columns of dry, moist and water-saturated tailings. The highest flux came from the column filled with moist tailings. This was explained by the effect of moisture content on the emanation coefficient. Water-saturated tailings gave the lowest flux because of the much lower diffusion coefficient of Rd through water.

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