The World Health Organization (WHO) reports that radon gas is the largest carcinogen causing lung cancer for non-smokers. Alarmingly, nationwide testing for indoor radon potential remains low. This study proposes the use of a field portable x-ray fluorescence (FPXRF) device to measure the concentrations of uranium and thorium in rock samples in DeKalb County, Georgia and use the concentrations to predict the radon potential emanated. Nine rock samples from each of the major geology types found in DeKalb County, Georgia were analyzed for uranium and thorium using the FPXRF, followed by analysis of radon using an AirThingsTM radon detection device. The study found strong positive correlations between uranium and radon and demonstrated that uranium concentrations can accurately predict the radon concentrations. The results suggest that a FPXRF can accurately measure uranium concentrations to predict radon potential.