Clay, consisting fine-grained minerals, is an interesting materials and can be used in a variety of diferent fields especially in dermatology application. Using clay such a field it is important to measure its natural radioacitivty. Thus the purpose of this study is to measure Ra-226, Th-232 and K-40 concentration in clay samples enriched with boron. Three different types of clay samples were prepared where boron is used in different rate. The measurements have been determined using a gamma-ray spectrometry consists of a 3 '' x3 '' NaI(Tl) detector. From the measured activity the radium equivalent activities (Ra-eq), external hazard index (H-ex), absorbed dose rate in air (D) and annual effective dose (AED) have also been obtained.