Measurement of natural radioactivity levels in soil in Tripoli

The activity concentration of radionuclides in surface soil around Tripoli metropolitan area have been measured using gamma-ray spectrometry. The average radioactivity concentrations of 238U, 232Th and 40K are 10.5, 9.5 and 270 Bq kg−1 respectively. The average outdoor terrestrial absorbed dose rate in air from gamma-radiation 1 m above the ground surface 23 nGy h−1.