Volume No. 6 Issue No.: 3A Page No.: 616-622 Jan-Mar 12




Sathish L.A.1*, Nagaraja K.1, Ramanna H.C.2, Sundareshan S.3

1. Department of Physics, Government Science College, Bangalore, (INDIA)
2. Department of Physics, Bangalore University, Bangalore (INDIA)
3. Department of Physics, Vijaya College, Bangalore (INDIA)
4. Department of CSE, Sri Balaji Chockalingam Engineering College, Tiruvannamalai (INDIA)


Received on : November 25, 2011




The present work is to assess the possible health hazards for the inhabitants of Bangalore Metropolitan, India due to 220Rn and its progeny in dwellings. The mode of sampling is passive and integrated for long-term measurements taking into account the diurnal and seasonal variations. The results reveal that the 220Rn concentration decreases exponentially with distance. As the distance increases from the wall, ceiling and the floorings of the room the concentration decreases exponentially. 220Rn concentrations in 91% of the dwellings were below 30 Bq m-3 and 9% of the dwellings had the concentrations above 31 Bq m-3 with a maximum of 69.4 Bq m-3. The 220Rn concentrations in winter is 1.74 times that of summer, whereas its progeny is 2.7 times that of summer season and not much variations were observed between rain and autumn seasons. The arithmetic mean concentrations of 220Rn and its progeny are 20.5 &plumn; 0.6 Bq m-3 and 0.4 ± 0.07 mWL.


Keywords : Indoor thoron, wall, flooring, SSNTD, 220Rn, Progeny levels