Indoor radon concentrations and building materials. Control of airborne radioactivity

The daughter products of radon are chemically active materials which, when inhaled are very likely to deposit in the respiratory tract. Defines a special unit, the working level, to indicate the radiation burden from radon daughters. Reports study of exhalation rates from various building materials made by enclosing samples in containers and analysing air samples from the containers. Gives table of results. Discusses control of airborne radiation by increasing the ventilation rate, sealing room surfaces, mechanical circulation and filtration of the air. Reports investigation at the Technical University of Denmark into the effects of ventilation, circulation and filtration of room air. Gives preliminary results.