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Study of radon exhalation rate from soil, Bangalore, South India

The 222 Rn exhalation rate measurements are useful in identifying the locations of high radon exposure. On the other hand, atmospheric 222 Rn concentrations have been observed as an effective tracer for terrestrial air mass movements and atmospheric mixing mass movements. In view of this, year-long measurements of 222 Rn and its exhalation rates were carried out at J B Campus of Bangalore city, and the diurnal and seasonal variations have also been studied. Diurnally, exhalation rate was found to be high during night and early morning hours and low during afternoon hours. The diurnal variability of temperature difference between the lower and upper layers of the soil was found to be responsible for the observed diurnal variations. The monthly average of 222 Rn exhalation rate ranges from 10.63 ± 1.75 to 4.95 ± 0.65 mBq m -2 s -1 . The annual mean value of radon exhalation rate was found to be 8.27 ± 1.83 mBq m -2 s -1 .