Assessement of Indoor Radon, Thoron and Their Progeny in Dwellings of Bareilly City of Northern India Using Track Etch Detectors

The levels of radon, thoron and their progeny in the dwellings of Northern India have been determined by using twin chamber dosimeter cups. The concentrations of radon and thoron were found to vary from 16.62–155.12 Bq/m and 4.16–24.93 Bq/m. Their progeny concentrations were found to vary from 1.80–16.77 mWL and 0.112–0.674 mWL. The values of life time fatality risk and annual effective dose were found to vary from 0.24x10–1.21 x10 and 0.31–2.78 mSv/y, respectively. The variation in the above parameters strongly influenced by the type of dwelling construction and their ventilation conditions.