[Behavior of radon in rooms and its use as indicator for ventilation measurements].

Investigations have been made to determine the relationship between indoor radon concentrations and ventilation rates and to find the sources for radon in different rooms. The results show that the radon concentration can be estimated by a simple mathematic model in the case of periodical ventilation. The results of measurements carried out in office rooms demonstrate that soil is the main source for indoor radon. The possibility to use radon for the determination of ventilation rates is discussed.