Abstract
Radon exhalation rates were studied using LR-115 (II) nuclear track detectors in and around the Makum coalfield, which has significant geological features. Exhalation rates (mass and surface) from coal and soil samples were studied with reference to the geological features. The mass and surface exhalation rates from coal samples ranged from 6.1–16.2 mBq/kg/h and 201.6–535.7 mBq/m2/h, respectively. The mass and surface exhalation rates from the soil samples collected from the Margherita Thrust area of the coalfield and the coalfield area lying in between the Margherita Thrust and Disang Thrust of the coalfield were found to be 10.7 mBq/kg/h and 354.2 mBq/m2/h, and 9.5 mBq/kg/h and 314.2 mBq/m2/h, respectively.
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