Radon Level and Its Changes in Internal and External Environments of Typical Residential Rooms in Shenyang City

The levels of radon and its daughter products together with their diurnal and seasonal changes in internal and external environments of typical residences and living quarters of Shenyaag city were reported. The geometric mean of radon concentrations inside end outside the rooms were 40.2 and 14.1 B_q·M^-3 respectively, their geometric standard deviations were 1,9 and 1.7 and the equilibrium equivalent radon concentrations inside and outside the rooms were 16.1 and 6,3 B_q·M^-3, respectively.