Assessment of Natural Radioactivity Levels and Radiological Hazards for Tigris River Basin
Activity concentrations of 226Ra (of 238U series), (232Th) and (40K) in some soil samples along Tigris River basin were determined and evaluated. The measurements were carried out using high purity germanium (HPGe) detector. The mean activity concentrations in soil samples were 18.2, 16.4 and 375 Bq/kg for 226Ra, 232Th and 40K, respectively. The absorbed dose rates (D), mean annual effective dose equivalent (AEDE), radium equivalent activity (Raeq), external and internal hazard indices (Hex and Hin) were evaluated to be 34.2 nGy/h, 0.042 mSv/y, 71 Bq/kg, 0.19 and 0.24, respectively, well within the relevant permissible limits of 59nGy/h for D, 1 mSv/y for AEDE, 370 Bq/kg for Raeq, and 1 for Hex and Hin. Accordingly, it is concluded that the natural radioactivity levels for Tigris River basin in Baghdad city satisfy safety radiation dose limit for.