Radon measurements in dwellings: Study in the Vaud canton (Switzerland)

Since 1994 the Swiss radiological protection ordinance provides a limit for radon concentrations in inhabited premises. Radon measurements are made in all cantons of Switzerland in order to find out the regions with high rado n levels and when necessary to take remedial actions on the affected buildi ngs. For the Vaud canton a sampling of at least 3 000 houses all over the t erritory is desirable to establish this classification. The preliminary res ults obtained after several measurement campaigns show radon levels compara ble to those in the non-affected areas elsewhere in Switzerland.