Аннотации:
A human receives more than half of the annual individual radiation dose from the
radon and its progeny contained in indoor air. Therefore, in order to limit domestic exposure of
the population in the Russian Federation the national radon control levels have been
established. The excess of these levels is not allowed in buildings with a long people’s
residence. Radon entry into the building through horizontal underground walling from the soil
base and therefore, the restricting of the soil radon flux in the ground floor rooms indoor air is
possible only with construction technologies and means. The effectiveness of radon-protective
technologies directly depends on the understanding of the laws of radon transport in porous
media, since this transport may occur through diffusion and/or convection (filtration). Each of
these mechanisms may be dominant under the certain conditions and requires its own radonprotective
measures. This article compares the density of diffusive and convective radon fluxes
in the entire range of soils permeabilities. The range of underground walling and soils
permeability was determined, in which the prediction of radon conditions in a building can be
built exclusively on the patterns of diffusive radon transport in porous media. The approach to
the underground walling design on the basis of the one-dimensional model of stationary
diffusive radon transport in porous media is proposed.
