Abstract :
Exhalation of 222 Rn, α-radioactive inert gas, is associated with the presence of 226 Ra and it s ultimate precursor uranium in the earth crust. It is a useful quantity to compare the relative importance of different materials of tiles (marble, granite and ceramic). Majority of new houses in Basrah (Iraq) are using tiles. Therefore, studies concerning the determination of radon exhalation rate from there materials were carried out using LR-115 Type ІІ passive technique in this content, the Solid State Nuclear Track Detectors(SSNTDs) with a plastic container( can technique) were applied .There container were hermetically sealed and stored for 120 days to attain equilibrium between 222 Rn and 226 Ra . After exposure to radon, LR115 type II detectors were etched in 2.5N NaOH solution at 60°C for 2h. From the measured radon concentration values , 222Rn exhalation rates were determined. The average values of exhalation rates for radon has been found of values ( 0.225, 1.529, 16.196 Bq m-2 h-1) for marble, ceramic and granite respectively. Exhalation rates for granite has been found to be several times higher than that for marble and ceramic. The results of the measurement has been discussed.
