Abstract
Data are presented for 210Pb and 210Po concentrations in three species of molluscs collected in the intertidal region of the coast of Rio de Janeiro, Brazil. Lead-210 activity in the soft tissue of the edible mussel Perna perna was 20 times higher than that found in its shell. The visceral mass contained the largest activity for both radionuclides, which is attributed to the feeding habits of the molluscs. Animals collected from Ponta Negra beach (open sea) showed higher concentrations of isotopes than those collected from Boa Viagem beach (within Guanabara Bay).
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