“…Thus in Egypt, surveys on natural radiation and radioactivity were organized, and is the only one to date covering the upper country since 1990. Their results are published in several papers, either published or in press, to analyze and discuss the main results of both the studies to determine natural radioactivity concentrations in soil, rocks, building materials, crops and water and natural exposure of the Egyptian population to terrestrial gamma radiation (El-Arabi, 1991;Ahmed et al, 1994Ahmed et al, , 2000Said et al, 1994;Abbady et al, 1999Abbady et al, , 2000El-Arabi et al, 2001;Moussa and El-Arabi, 2003).…”