Determination of the radon diffusion length in building materials using electrets and activated carbon.

This work presents a technique for determining the radon (222Rn) diffusion length in porous materials. A mathematical model that describes the process of radon diffusion in a closed chamber, divided into two sections by a porous building material, is proposed. The derived relations allow evaluating the radon diffusion length in the material from measurements of the radon concentrations in the two sections.