Abstract: Concentrations of ²¹⁰Po in 17 kinds of aquatic organisms were determined by an isotope tracing method, and ²¹⁰Po concentrations in different parts of shrimps’ bodies were also measured. The concentrations of ²¹⁰Po in edible parts of aquatic organisms were 0.15-34.8 Bq/kg of fresh weight, and the variations between different aquatic organisms were large. Aquatic organisms of crustaceans, cephalopods, and shellfishes have strong enrichment capability for ²¹⁰Po, and especially the ²¹⁰Po concentrations in oysters, octopus, crab,squid were 34.8, 25.0, 20.3, and 17.2 Bq/kg of fresh weight respectively, which are higher than our national limit for the ²¹⁰Po concentration in food. ²¹⁰Po concentrations in different parts of shrimp’s bodies presented a distribution pattern: the highest in heads, moderate in shells, and the lowest in meats.

Key words: ²⁰⁹Po, tracer, ²¹⁰Po concentration, aquatic organisms, shrimps