Since the seas are considered one of the main sources of food for humans, the food taken from them must be free of pollutants of all kinds. In this study, samples of biota and fish were collected from Iraqi marine waters, as well as from the local market, and the specific activity of natural radionuclides was measured using gamma spectroscopy with a 3 × 3 NaI(Tl) crystal. In the Iraqi marine samples, the average value of radionuclides (Ra-226, Th-232, U-238, K-40, and Raeq) was 24.89 ± 6.9, 7.34