Natural Radioactivity in Houses and Mine Atmospheres in India

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Abstract
Natural radioactivity due to radon and its daughters indoors contributes significantly to the total radiation exposure of man. A number of non-radioactive mines have been found to have high levels of radon and its daughters. Levels of natural radioactivity measured in dwellings and some of the non-radioactive mines in India are presented. The methods employed for these studies, grab sampling and alpha counting, nuclear track detector films and track counting, are briefly described. Indoor radioactivity results are given for dwellings in known elevated natural background areas and around hot springs with high dissolved radium. In general, the levels of natural radioactivity in dwellings have been found to be small fractions of a Working Level. Some of the non-uranium mines have, however, been found to show higher Working Level concentrations. Reasons for these observations have been discussed. Results for radon in structures built with coal fly ash bricks are also presented.

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