Assessment of the possible radiological hazard caused from marble and granite tails commercially available in Egypt Online publication date: Mon, 09-Jan-2017
by A.M.A. Mostafa
International Journal of Low Radiation (IJLR), Vol. 10, No. 3, 2016
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.
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