ACCOUNTING OF THE GROUND PROPERTIES IN THE MODEL OF INDOOR RADON SITUATION FORMATION
Last studies have shown that radon and it progeny in indoor air forms the most part of human annual radiation dose. As a result, investigation of the radon situation regularities in a building is an actual scientific and practical problem. Radon situation in a building is the result of the radon transport processes in the “ground - atmosphere - building»” media system. The multifactor character of radon situation formation process makes the difficult interpretation of the “in situ” measurements results. Therefore mathematical modeling is the only effective means of radon entry describing into the lower floor apartments of the buildings. The radiation safety of the designed buildings and structures is the object of this study, and it purpose is to substantiate the type and characteristics of the mathematical model that allows to describe adequately the radon entry into the projected buildings on the basis of diffusion radon transport model. Experimental (experiment and modeling) and theoretical (idealization and correlation analysis) research methods are used in the work. The “equivalent” radon diffusion coefficient in the material introducing justified the laboratory experiment results. This coefficient allows for the contribution of thermodiffusion and bardiffusion effects to the radon transport process. In addition, the mathematical model of radon transport in the “soil - atmosphere - building” media system is a proposed; the calculations results showing the relationship between the main radon situation parameters in a building.