Radon exhalation from some finishing materials frequently used in Syria

Building materials are one of the main radon sources in dwellings. Therefore, the determination of radon exhalation from these materials will help in prediction the existence of dwelling with potential radon risk.Ceramic tiles and marble samples were collected from Syrian local market. The correlation between radon exhalation from these materials and radium-226 content was studied. Results showed that there is no clear relation between radium content and radon exhalation rate, and the exhalation of radon did not exceed the permissible limits of American Environment Protection Agency (EPA).In addition, the additional annual dose from radon and gamma of the natural radioactivity in ceramic and marble when used as finishing materials in houses was also estimated and found to be not exceeding 20 μSv and 35 μSv from radon and gamma respectively.