Abstract
Indoor radon concentrations were measured inside different types of dwellings in Chennai city on a quarterly basis using a solid state nuclear track detector (LR-115, Type II) for 1 year. Significant seasonal variations were observed. The average highest radon concentration was observed during winter (86.08 Bq m−3) and the lowest in summer (42.50 Bq m−3). The radon concentrations were also varying on the basis of different floor-covering materials. For a given season, the average maximum radon concentration was observed with cement flooring (118.96 Bq m−3) followed by tiles (75.25 Bq m−3) and marbles (74.04 Bq m−3). Also, outdoor soil samples were collected in and around the same dwellings and determined the radioactivity content of three primordial radionuclides (238U, 232Th and 40K) in these soil samples using NaI(Tl) scintillation detector based gamma-ray spectrometer.
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