Kaolin deposits are among the world's most important and useful industrial materials. In southwestern
Sinai, kaolin occurs interbedded with sandstones in east and northeast Abu Zenima area and in southern
Cliff of El Tih plateau. The present work is concerned with the natural radioactivity of these kaolin deposits.
Naturally occurring radionuclides are measured radiometrically as well as chemically on the representative
kaolin samples from Wadi El Iseila, Wadi El Khaboba and Wadi Abansakar. The main target is to discuss
the behavior of the naturally occurring radionuclides and to assess their possible environmental hazards and
economic importance. The present work characterizes the main radiometric signatures of the Carboniferous
and Cretaceous kaolin resources in the studied areas. Calculated environmental parameters indicate that
some kaolin types cannot be used as building or decorative material of dwelling.