Wadi El-Nabi' area (῀400km 2 ) constitutes Precambrian intrusive-extrusive complex related to the Egyptian-Nubian Shield (ENS). It includes ophiolitic serpentinites, felsic-mafic metavolcanics (bimodal metavolcanics), metapyroclastics (metatuffs), metagabbro-diorite complex, olivine gabbros, and troctolites (young gabbros), and monzo-syenogranites (younger granites). The field and lab radiometric measurements of radioelements, and their geochemical characteristics were carried out for (15) samples of monzo-syenogranites (55 km 2 ) by RS-230 γ-ray spectroscopy, and HpGe detector. Chemical analyses by ICP-MS are also obtained for the studied granitic rocks to verify the concentrations of specific elements and their inter-relationships with ( 238 U (ppm), 232 Th (ppm), and 40 K (%). Regarding the RS-230 measurements, the of radionuclide concentrations range are (4-6.6 ppm) for eU, (8.7-14.75 ppm) for eTh, and (3.62-5.15%) for K%. On the other hand, the chemical analysis for 238 U, 232 Th (ppm), and 40 K%, of monzo-syenogranites give rise to 3.04 ppm for 238 U, 9.44 ppm for 232 Th, and 1.82 % for 40 K%. The field, and lab radiometric measurements, chemical parameters of P, and D-factors ( 226 Ra/ 238 U, and Uc/Ur respectively) give rise to the disequilibrium state is well evident. On the other hand, the chemical interpretations given by multi-variation diagrams among 238 U, 232 Th, and 40 K, as well as selected elements indicate that the origin of the studied radioactive elements are related to the magmatic process, followed by the later post-magmatic process (hydrothermal).
