[en] 90Sr, 210 Pb, 210Po and Ra isotopes were determined in macroalgae Ceramium rubrum, Cystoseira crinita, Ulva rigida, Cladophora vagabunda, Enteromor- pha intestinalis and in mussels Mytilus galloprovincialis collected from the Bulgarian Black Sea coast. Radio- chemical 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.
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