الفهرس 
ABSTRACT
Environmental RadioactivityOnly 14 pages are availabe for public view
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Abstract
In this study, the radiological pollution resulting from the using of ceramic tile locally produced and commonly used as building materials in Egypt has been assessed by determining the contents of natural radionuclides (226Ra, 232Th and 40K). Determination of these radionuclides has been performed using a gamma ray spectrometry with a reverse electrode high purity germanium (REGe) detector. The measured average activity concentrations of 226Ra, 232Th and 40K were 47.4±3.3, 42.84±2.8 and 313.6±34.3 Bqkg-1 respectively. The obtained concentrations were compared with the reported data of other countries. The Raeq values of all samples were lower than the limit of 370 Bq.kg-1, equivalent to a gamma dose of 1.5 mSv.a-1 recommended by OECD. With average total annual dose being only 0.07 mSv.y-1, this value is about 7 % of the 1.0 mSv.y-1 recommended by the International Commission on Radiological Protection (ICRP-60, 1990) as the maximum annual dose to members of the public.