INDOOR RADON MEASUREMENTS IN SOME INDIAN CITIES

Potential alpha energy concentration (PAEC) due to radon and its proge nies has been measured in dwellings of three different cities in India ; namely Allahabad (in north central region), Vishakapatnam (in south eastern region) and Shillong (in north eastern region), The measuremen ts were carried out by a passive, time-integrated method, using LR 115 (Type II) detector in bare mode. The geometric mean of potential alph a energy concentration in dwellings of Allahabad, Vishakapatnam and Sh illong has been estimated to be 10.1 mWL, 3.9 mWL and 11.3 mWL, respec tively. The results obtained for dwellings in these three cities are d iscussed in the light of exposure limits set by the International Comm ission on Radiological Protection (ICRP).