The radon risk in buildings

Recent research has revealed a potential health risk from building materials and sites which have a degree of radioactivity. Radium, in the form of radon gas and of ‘radon daughters’ particles, especially when emitting gamma radiation, is the main threat. It has caused much controversy in Sweden, leading to an interim report by the Radon Commission, which is discussed here by a member of the Building Climatology and Installations Division of the National Building Research Institute of Sweden.