Abstract
This study reports the exhalation rates of radon and thoron from surface soil collected from 60 rural sites of district Hisar, Haryana, India. The exhalation rates of Rn222 (radon) and Rn220 (thoron) were measured by portable SMART RnDuo (AQTEK SYSTEMS) using a mass accumulation chamber which was equipped with a scintillation material-coated cell. Dose rates due to natural gamma radiations ranged from 0.526 to 1.139mSv y-1. The Rn222 mass exhalation rate in soil samples varied from 0.14 to 94.65mBqkg-1h-1. Thoron surface exhalation rates ranged from 46.42 to 619.88 Bqm-2h-1. This study gives an idea about the differences in Rn222 and Rn220 exhalation at different locations which may be due to variations in geological features of the locations and characteristics of the topsoil. The findings show that usage of study areasoil as building material is safe.
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