Gamma-ray spectrometry (GRS) can be very helpful in mapping radioelement data. The method provides estimates of apparent surface concentrations of the most common naturally occurring radioactive elements: potassium (K), uranium (eU), and thorium (eTh). The use of the method is based on the assumption that absolute and relative concentrations of these radioelements vary measurably and significantly with lithology. The composite image technique is used to display simultaneously three parameters of the radioelement concentrations and ratios on one image. The technique offered much in terms of lithologic discrimination based on color differences. In this study, the airborne gamma-ray spectrometric survey data were interpreted to construct the Interpreted Spectral Radiometric Lithologic Unit (ISRLU) map, determine the uranium and thorium anomalies (four uranium leads and three thorium leads), and confirming the result by field check.