This study analyzed the concentrations of potassium, thorium and uranium of the atmospheric PM10 aerosols which were collected at Gosan of Jeju Island during the year of 2014. The mean mass concentration of PM10 was 47.31 μg/m3. The mean radioactive concentrations of 40K, 232Th and 238U were 7.89, 0.25 and 0.30 μBq/m3, respectively. The 232Th/238U activity concentration ratio of PM10 was 0.830. The 232Th/238U ratio during Asian Dust days is 1.073, which is higher than those in other atmospheric conditions. The concentration ratio of 232Th/238U was 0.902 in China continent.