B.A Almayahi - Department of Environment, College of Science, University of Kufa, Iraq ,School of Physics, Universiti Sains Malaysia, ۱۱۸۰۰ USM, Penang, Malaysia

This study conducted using a NaI (Tl) gamma-ray spectrometer for the assessment of naturally radioactive materials. This apparatus is devoted to the quantitative and qualitative determination of U, Th, and K in soil samples collected from the city of Najaf, Iraq. The average of concentrations in the surveyed soil samples were ranged from 55 to 102 Bq kg-1, ND to 448 Bq kg-1 and 79 to 1887 Bq kg-1 for 238U, 232Th, and 40K, respectively. To assess the radiological hazard of radioactivity in the soil samples, the radium equivalent activity, annual effective dose, external hazard, and internal indices were calculated. The Raeq values of soil samples were lower than 370 Bq kg-1 recommended maximum levels of radium equivalents in soil.

Gamma spectrometry, NaI (Tl), Environmental radioactivity, Radiological hazard,