/Docs/G/Org-IAEA-Safety-GSR3-CmA/Sec/5_Existing_0.md
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Requirement 50: Public exposure due to radon indoors
The government shall provide information on levels of radon indoors and the associated health risks and, if appropriate, shall establish and implement an action plan for controlling public exposure due to radon indoors.
  1. As part of its responsibilities, as required in para. 5.3, the government shall ensure that:
    1. Information is gathered on activity concentrations of radon in dwellings and other buildings with high occupancy factors for members of the public53 through appropriate means, such as representative radon surveys;
    2. Relevant information on exposure due to radon and the associated health risks, including the increased risks relating to smoking, is provided to the public and other interested parties.
  2. Where activity concentrations of radon that are of concern for public health are identified on the basis of the information gathered as required in para. 5.19(a), the government shall ensure that an action plan is established comprising coordinated actions to reduce activity concentrations of radon in existing buildings and in future buildings, which includes54:
    1. Establishing an appropriate reference level for 222Rn for dwellings and other buildings with high occupancy factors for members of the public, with account taken of the prevailing social and economic circumstances, that in general will not exceed an annual average activity concentration due to 222Rn of 300 Bq/m3 55;
    2. Reducing activity concentrations of 222Rn and consequent exposures to levels at which protection is optimized;
    3. Giving priority to actions to reduce activity concentrations of 222Rn in those situations for which such action is likely to be most effective56;
    4. Including in building codes appropriate preventive measures and corrective actions to prevent the ingress of 222Rn and to facilitate further actions wherever necessary.
  3. The government shall assign responsibility for:
    1. Establishing and implementing the action plan for controlling public exposure due to 222Rn indoors;
    2. Determining the circumstances under which actions are to be mandatory or are to be voluntary, with account taken of legal requirements and of the prevailing social and economic circumstances.