Assessment of radioactivity level and associated radiological hazard in riverbed samples within industrial areas.

Terrestrial gamma radiation is one of the major outdoor radiation exposures to the general public that varies substantially based on the type and geological properties of the soil. The objective of this study is to evaluate the naturally occurring radioactive materials (NORMs) distribution and assess the hazard parameters in the riverbank soil within various industrial zones in the densely populated Dhaka and Chattogram cities of Bangladesh. The mean activities of Ra (37 ± 3), Th (58 ± 4), and K (1129 ± 18) Bqkg in the assessed soil samples were found to be slightly higher than the world average values 32, 35, and 420 Bqkg, respectively.