Radiological analysis was carried out on fish, crustacean and sediment samples collected from both fresh and
marine water of river Igbokoda in the coastal area of Ondo State, Nigeria. The activity concentrations of radionuclides were
determined using gamma spectrometry method. The means of the annual effective ingestion dose varied between 23.3 ±
10.2μSv.y
-1 (
Oreochromis niloticus
and
Gymnarchus niloticus
) and 34.8 ± 1.7 μSv.y
-1 (
Parachnna obscura
) for fresh water fish
samples and 6.4 ± 0.7 μSv.y
-1 (
Chrysithctys nigrodigitatus
)and 14.2 ± 1.6 μSv.y
-1 (
Cynoglossus senegalensis
) for marine water
fish samples. That of the crustacean samples (
Peanus monodon
) was 2.4 ± 0.2 μSv.y
-1. The equivalent dose to the skin of
humans from contact with sediment was 2.0 μSv.y
-1 and 1.2 μSv.y
-1 for the fresh and marine water sediments, respectively. The
effective dose was calculated as 0.010 μSv.y
-1 and 0.006 μSv.y
-1 for the fresh and marine water sediments, respectively. The
equivalent doses obtained are less than the ICRP recommended 50mSv per annum for the public.
