Energy is a critical requirement for economic development and specifically to improve living conditions. It is one of the basic inputs in everyday life of human beings. Geothermal Energy is one of the renewable energy sources that originate from the earth's molten interior and the decay of radioactive materials in underground rocks. Heat is produced by the decay of radioactive elements, including 40 K, 238 U, and 232 Th. In this study, the analysis of the radio-isotope contents and concentration in the Aluto langano geothermic brine, scale and soil were performed. The data collections were carried out directly from the geothermal site and then analyzed using a gamma-spectrometer with high purity germanium detector with GENIE 2000 software. The analysis were made then for the 226 Ra, 232 Th, and 40 K radionuclides for the brine, soil and scales samples collected from the geothermal power plant site in Aluto Langano in Ethiopia. According to the analysis, the measured activity concentrations of the brine samples for 238 U, 232 Th and 40 K were ranged from 0.65 to 3.63,1.7 to 8.26 and 11.05 to 16.5 Bq/Kg with mean values of 2.2, 4.51 and,13.7Bq/Kg respectively.The value of measured activity concentration of 238 U, 232 Th, and 40 K were ranged from 8.5 to 18.17, 22.1 to 88.65 and 284 to 548.4 Bq/Kg with mean values of 13.66, 47.28 and 409.3Bq/Kg for scale sample respectively. The value of measured activity concentration of 238 U , 232 Th and 40 K were varied from 29.5 to 69.92 , 57.1 to 206 and 695 to 925 Bq/Kg with mean values of 51.2, 136.62 and 791.4 Bq/Kg for soil samples respectively. NORM scaling related to gamma emitting radionuclides in geothermal system do not significantly affect the functions of its power plant. In this study the composition of alpha emitters could not be determined attributable to absence of alpha spectrometry which directly measures the concentration of radionuclides that emits alpha particles directly. Keywords: Natural occurring, Radioactive material, Geothermic system, Aluto Langano