الفهرس 
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Abstract
This work started by collecting red clays from Aswan city in Egypt and blending them with various percentages of three oxides (PbO, Bi2O3 and CdO) with the aim of fabricating novel clay materials with enhanced gamma-radiation-shielding features. The MAC for the prepared materials was experimentally measured and compared with the theoretical results determined by XCOM. The measured and XCOM data agree to a very high degree of precision. Accordingly, the experimental setup used in this study can be reliably used to determine the shielding ability of the investigated clays. The Zeffof pure red clay, red clay with 10 wt%, and red clay with 30 wt% PbO, Bi2O3, and CdO is reported. The Zeff results demonstrated that introducing any of these three oxides into clay will greatly enhance its Zeff, and, consequently, its attenuation capability. The Zefffor red clay with 30 wt% CdO is lower than the Zeffof the clays with 30 wt% PbO and Bi2O3, and the clay with 10 wt% CdO, 10 wt% PbO, and 10 wt% Bi2O3. Additionally, we found that the Zeffincreases with an increase in PbO content, meaning that the Zeffof the red clay with 30 wt% PbO is greater than that of the sample with 10 wt% PbO.