Lung Cancer Risk from Indoor Exposures to Radon Daughters

This report of the task group relates specifically to the risk associated with indoor exposure, particularly that resulting from inhaled 222-Rn daughters. This type of exposure contributes the largest fraction of the natural radiation dose to populations living in the temperate regions of the world. A major part of this indoor exposure depends strongly on social factors and individual living habits. For this controllable fraction of natural radiation exposure, the principles for limiting exposure of the public to natural resources of radiation which have been recommended by the Commission (IC 84) should be observed. In this context, the results presented in this report may provide guidance to the competent national authorities for the setting of action levels in existing houses and for the optimization procedure in the planning of future houses.