Measurements of natural radionuclide Levels and Hazards in Lega Dembi Gold Mining, Oromia, Ethiopia.

Abstract

This study aimed to evaluate natural radioactivity levels and hazards of radionuclides 226Ra, 232Th, and 40K in soil samples taken from 15 locations in the Lega Dembi gold mining, Oromia, Ethiopia, using gamma-ray spectroscopy coupled with an HPGe detector. It was observed that the respective mean specific activities for 226Ra, 232Th, and 40K determined in the mining site were 23.87±0.7, 52.5±1.8, and 391.62±11.35 Bq/kg, and 8.89±0.4, 13.83±0.6 and 423.68±9.5 Bq/kg in the living areas. The specific activity of 232Th was above the permissively limit in the mining site, while for 226Ra and 40K were within the limit. The specific activity of 40K in the living area was observed to be above the permissively limit. The calculated value of radiation hazards parameters; radium equivalent activity (Raeq), internal and external hazards indices (Hin and Hex), the mean annual effective dose (AED), and gamma representative indices (Iγr) were within permissively limit. The mean absorbed dose rate in the mining site was above the recommended safety limit. The total annual gonadal dose equivalent value was found to be 494.8±8.7 µSv/year in the mining site. This value was also above the permissively limit values of 300 µSv/year.