Investigation of natural radionuclide contents in soil in Qinghai Province

The methods and results of investigation of natural radionuclides contents in soil in Qinghai Province is reported. The sampling points were selected as the same points as that for measuring terrestrial γ radiation does rate. 444 soil samples were simultaneously collected as terrestrial γ radiation does rate measurement, of which 185 samples were net-checking with 50 km x 50 km. The soil samples were measured by γ spectrometry. The results show that the area-weighted mean of 238U, 226Ra, 232Th and 40K was 44.2, 34.7, 44.2 and 525.8 Bq·kg-1, respectively. The pint-weighted mean of 238U, 226Ra, 232Th and 40K was 44.2, 35.5,45.1 and 528.3 Bq·kg-1, respectively