AQUACULTURE RESEARCH, cilt.51, sa.6, ss.2190-2196, 2020 (SCI-Expanded)
In this study, natural radioactivity concentrations of fish feed and feed raw materials were assessed. Several feeds and raw materials were provided from the suppliers who dominate the aquaculture sector. Ra-226, Th-232 and K-40 concentrations were determined by using a high-purity germanium detector. The measured activity concentrations of samples ranged from 3.28 +/- 0.27 to 15.90 +/- 1.36, from 1.27 +/- 0.10 to 12.07 +/- 1.21 and from 52.01 +/- 2.60 to 1,158.96 +/- 54.42 Bq/kg for Ra-226, Th-232 and K-40 respectively. The gamma dose rate and annual effective dose rate of samples were calculated to be in the range of 1.99-50.47 nGy/h and 2.44-61.89 mu Sv/yr respectively. Since the calculated radiological risk parameters of the samples were lower than the world wide average values, the radiation hazard is insignificant for human handlers.