This work deals with the determination of natural radioactivity of soil in Guangdong Province Xiazhuang granite uranium ore field by using a γ-ray spectrometer. The activity concentrations for 226Ra
232Th and 40K obtained were 112 (from 40.2 to 442)
71.5 (from 32.6 to 88.1)
and 672 (from 442 to 913) Bq/kg
respectively. Compared with the average value of countrywide and worldwide
the activity concentration of 226Ra was obviously greater than them. To assess the radiological hazard of the natural radioactivity in soil
the absorbed dose rate and annual effective dose rate were calculated. The results show that there is a normal level of natural radioactivity of soil in the Xiazhuang granite uranium ore field.