In India, out of about 0.7 million miners, nearly 0.5 million persons are
directly engaged in coal operations. Radon and its progeny levels have been
quantified in the coal-mining environment of Godavarikhani, Andhra Pradesh,
India using solid-state nuclear track detectors. Seasonal and mine depth
variations in radon levels have been recorded resulting in the
identification of locations with a high radon level as areas with no mining
activity, active mining operational zones and return air ventilation paths.
All these radon levels were below the permissible levels. The average
concentrations of radon and its progeny levels were found to be 144±61 Bq m-3 and 20±11 mWL (working level) respectively in the
two-incline mine, and these values for the five-incline mine are recorded
as 315±71 Bq m-3 and 30±9 mWL respectively.