²¹⁰Po in mussels and shrimp from Ilha Grande Bay, Rio de Janeiro, Brazil

¹ Pontificia Universidade Católica do Rio de Janeiro, 22453-900 Rio de Janeiro, Brazil
² Instituto de Radioproteção e Dosimetria, CNEN, 22780-970 Rio de Janeiro, Brazil

Abstract

Perna pernamussels and shrimp, Xiphopenaeus kroyeri,collected in August 2010 at Ilha Grande Bay, a tropical estuary in the state of Rio de Janeiro coast, were analyzed for ²¹⁰Po contents. The method for the determination of ²¹⁰Po consisted of spontaneous deposition on copper discs, followed by alpha counting. The average values found for the activity concentration of ²¹⁰Po in Perna pernamussels were 105.1 Bq kg⁻¹ (8 cm size) and 98.4 Bq kg⁻¹ (4 cm size), wet basis. For the shrimp, the values varied from 26.17 Bq kg⁻¹ to 29.56 Bq kg⁻¹ (wet basis) for the tail muscle, and from 274.49 Bq kg⁻¹ to 428.82 Bq kg⁻¹ (wet basis) for the head.