Ionizing radiation, emanating from decaying nuclides, poses potential biological harm to human organs. Wadi B, a village within the Jere local government area of Borno State, Nigeria, is currently undergoing oil exploration activities. This study was conducted to evaluate the outdoor gamma radiation levels at the Wadi B oil exploration site. Utilizing a portable hand dosimeter (Radiation Alert Inspector), gamma exposure levels (GEL) were measured across sixteen (16) spots within the exploration site. Results revealed that the gamma exposure levels measured in the boreholes FYM (1 to 8), range from 0.17- 0.27 Mr/hr, with an average of 0.21 Mr/hr while, the levels around the wells FYM (9 to 16) vary from 0.14- 0.25 Mr/hr, with an average of 0.18 Mr/hr. The estimated annual effective dose (AED) varied from 0.24528 to 0.47304 ?Sv/yr, averaging at 0.3460 ?Sv/yr. Notably, the average values of Total Dissolved Solids (TDS), Conductivity, and Gamma radiation exceeded the recommended limits established by the World Health Organization (WHO, 2006), which are 400 ?S/cm for conductivity, (50-150) ppm for TDS, and 0.002 mR/hr for radiation doses, respectively. However, the calculated Excess Lifetime Cancer Risk (ELCR) values were lower than the proposed world average level of 70 ?Sv/yr by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). This study suggests a heightened risk of exposure to outdoor ionizing radiation among inhabitants residing near the study locations.