Radioactivity concentrations and dose rates of 40 K, 226 Ra and 228 Ra in fishes as internal dose rates from major rivers in Ijebu water side of Ogun State Southwest of Nigeria had been determined by gamma spectrometry using NaI (TI) detector coupled with a pre-amplifier base to a multiple channel analyzer (MCA). 12 samples of fishes were collected from two major rivers in the study area: Odeomi and Imakun. Brycinus longipinnis had the highest mean concentration and dose rate values of 87.07 ± 5.83 Bq/kg and 0.0078 mGy/hr respectively. For 226 Ra, Pylodictus olivaris had the highest mean concentration and dose rate of values 1.84 ± 0.63 Bq/kg and 3.22 x 10 -7 mGy/hr respectively. Papyrocranus afer had the highest mean concentration and dose rate of 228 Ra with values 7.21 ± 0.49 Bq/kg and 8.08 x 10 -13 mGy/hr, respectively. The average dose rate of the radionuclides in the fishes was calculated to be 1.64 x 10 -3 mGy/hr which is below the 0.4 mGy/hr limit recommended by National Council on Radiation Protection (NCRP), (1991) as reported by Blaylock et.al (1993) which has no negative radiological health implication to the aquatic animals.
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