Abstract: We report the radiation environment monitoring of an enterprise developing and utilizing monazite in Guangdong Province. The results show that in 2019 and 2020, the air absorption dose rate of γ radiation in the surrounding area is 113-263 nGy/h. The concentrations of radon and thorium in air are less than 3.7-25.4 Bq/m³ and 5.9-14.2 Bq/m³ respectively. The contents of U, Th and ²²⁶Ra are 0.99-4.85 mg/kg, 31.4-90.0 mg/kg and 18.9-57.9 Bq/kg, respectively. The contents of U, Th and ²²⁶Ra in groundwater were < 0.04-0.10 μg/L, <0.05-0.16 μg/L and <2.0-5.7 mBq/L, respectively. The total amount of U and Th in wastewate is far less than the standard discharge limit of pollutants in rare earth industries.

Key words: NORM, Monazite, Radiation environment monitoring