Natural radioactivity in cephalopod molluscs from Kerala coast: baseline concentrations and health risk implications
摘要
The study examined natural radionuclide levels in edible muscles of cephalopod species consumed in Kerala. Uranium (238U) concentrations ranged from 1.14 ± 0.06 to 1.72 ± 0.07 Bq kg−1, while thorium (232Th) levels were between 0.08 ± 0.02 and 0.66 ± 0.04 Bq kg−1. Polonium (210Po) showed higher concentrations, ranging from 4.7 ± 0.9 to 27.2 ± 3.3 Bq kg−1, and lead (210Pb) levels varied from 3.8 ± 0.9 to 24.6 ± 6.8 Bq kg−1. Squids, being pelagic, accumulated higher amounts of 238U and 210Po, whereas cuttlefishes, being benthic, showed greater levels of 232Th and 210Pb. Statistical analysis revealed significant differences in radionuclide concentrations among and within cephalopod species, influenced by habitat and taxonomy (p < 0.05). The annual committed effective dose (ACED) for coastal residents consuming these cephalopods was assessed. 210Po was the main contributor to radiation dose, comprising over 80% of the total dose from all radioisotopes analyzed. Despite this significant contribution, the study concluded that health risks from consuming these cephalopods were within acceptable safety limits.