Notes: The p. 216 of Radiation Safety Rules stipulates that the territories allocated for building of residential construction where the radon flux density exceeds 80 mBq/m2sec, the construction design shall incorporate the system for protection against radon (moonlit concrete pad, special isolations of basement and other). If the radon flux density equals or below 80 mBq/m2sec the necessity of measures for protection against radon are specified in agreement with the regulatory authority. According to the point 40 of the Radiation Safety Norms, in case of higher values of the volumetric activity there should be carried out measures mitigating the penetration of radon in the room air and protective measures to improve the ventilation.
  