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Radon transport through concrete and determination of its diffusion coefficient.

The diffusion transport of radon was simulated for different types of concrete, by varying the parameters of concrete. The time t(s), needed to achieve a steady state, was determined for different diffusion constants. The graphical dependence of t(s) relative to the diffusion constant, called the diffusion curve has been calculated. By comparing the experimentally obtained values for t(s) and the diffusion curve, the diffusion constants were determined for the most frequently used type of concrete in our country. The diffusion coefficient determined for this type of concrete is in the range of data for various types of concrete found in the literature. The method described and applied here could be used to determine the diffusion coefficient for each type of concrete. Knowledge of the diffusion coefficient could enable estimation of the radon flux density into the building.