Abstract
The Track-Etch technique using LR-115 type II plastic track detectors has been employed for measuring the radium content and radon exhalation rates of different types of building materials. Among the eight materials studied it was found that fine aggregates (Badarpur) show the greatest radon exhalation, whereas portland cement produces minimum values of radon exhalation. Experimentally-measured values of the effective radium content (in Bq kg -1 ) their mass exhalation rates (in Bq kg -1 d -1 ) and surface exhalation rates (in Bq m -2 d -1 ) are reported.
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