MEASUREMENTS OF RADON CONCENTRATION IN SOIL GAS OF URBAN AREAS, BULGARIA *

These work present results of preliminary study of radon concentration in soil gas at 64 locations within 13 urban areas of Bulgaria using AlphaGuard equipment. The measuring period was from 2008 to 2012. The temperature and humidity has been measured as well, including the gamma dose rate. The radon concentration in soil gas was found to be log-normally distributed within the range from 3–97kBq m−3, with arithmetic mean of 26 kBq.m−3. The influence of the meteorological and geological factors in relation to radon measurements was examined. Correlation between radon in soil gas and gamma dose rate was also present.