Determination of anthropogenic and natural radionuclide distribution along the Bulgarian Black Sea coastal area has been performed by low level gamma spectrometry. Results were obtained for different types of environmental samples: sea bed sediments, eight types of algae species and sea water. Monitoring for 35 sampling sites has been performed from 1991 to 1996. A comparison between the results of nuclide content in algae and sediments was made. The data obtained show that radionuclide concentrations depend strongly on the sediment nature (sand, sandy, silt, slime). Small variations of nuclide content in sand and sandy sediments are obtained, while the variations for slime and silt sediments are greater. The concentrations of artificial and natural gamma emitters in algae depend mainly on the algae species type. The content of most natural radionuclides in algae is close to the LLD except those for the species Bryopsis plumosa. The results for the nuclide concentration values in Black Sea sediments and algae will enable the creation of a database and assessment of radionuclide transfer and accumulation trends in marine ecosystems.

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