[en] One of the sources emitting radioactivity and forming additional exposure to public is radon and its decay products. Especially the urgent radon problem exists in residential areas located very close to uranium tailings. Air sampling revealed that radon content and its decay products in air samples taken within the Gozien settlement are above the background values typical for present settlement. It brings in additional contribution to radiation exposure from radioactive emission for public living close to the tailings. It is known that the basic role of radioactivity formation in waste belongs to radium-226, a decay product of which is radon-222. One of the directions which reduce public exposure against radon is preserving or disposal of uranium tailings by their coverage with different thickness layer of neutral soil. With the purpose of determination of granulometric composition layer of neutral soil impact on radon migration process we carried out investigations on three models and in each of them the emanation layer was covered by neural soil containing different size class fractions.