⁹⁰Sr, ²¹⁰Pb, ²¹⁰Po and Ra isotopes in marine macroalgae and mussel Mytilus galloprovincialis from the Bulgarian Black Sea zone

⁹⁰Sr, ²¹⁰ Pb, ²¹⁰Po and Ra isotopes were determined in macroalgae Ceramium rubrum, Cystoseira crinita, Ulva rigida, Cladophora vagabunda, Enteromorpha intestinalis and in mussels Mytilus galloprovincialis collected from the Bulgarian Black Sea coast. Radiochemical separation was made by a fast and reproducible procedure based on a calcium phosphate precipitation technique. The obtained results for macroalgae vary in the interval 0.23-0.85 Bq kg^-1 for ⁹⁰Sr, 2.2-10.6 Bq kg^-1 for ²¹⁰Pb, 1.2-9.7 Bq kg^-1 for ²¹⁰Po and 1.9-13.2 Bq kg^-1 for Ra isotopes. Data obtained for mussels demonstrate similar abilities in the accumulation of ⁹⁰Sr, ²¹⁰Pb and Ra isotopes. (author)