Abstract
This paper reports the natural radioactivity and possible radiological hazards in different types of local and imported marble and granite tiles used as covering building materials in Egypt. Gamma-ray spectrometry was used to estimate the 226Ra, 232Th and 40K activity concentrations. The obtained values were found in the ranges 15-73, 29-203, and 50-253 Bq kg−1 in marbles and 23-179, 78-317, 113-1207 Bq kg−1 in granites for 226Ra, 232Th and 40K, respectively. Using indirect methods radon exhalation rates were calculated, the obtained values varied from 2.1 to 9.7 and from 3-23.9 Bq m−2 h−1 for marble and granite samples, respectively. Radon concentrations in the room caused by marble and granite samples were also estimated. Under normal ventilation (0.5 h−1), the obtained values were below reference level (100 Bq m−3) recommended by World Health Organization. Most values of external annual dose and annual doses due to the indoor radon exposure (ERn) were within recommended.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
