Abstract
Natural, as well as artificial gamma emitters have been monitored systematically since 1984 in marine environmental samples from the Romanian sector of the Black Sea coast under a project run by the Romanian Marine Research Institute and the Institute of Environmental Research and Engineering. The Bryopsis plumosa green alga was identified as having the highest concentrations of radionuclides belonging to the natural radioactive series of uranium-radium and thorium, two orders of magnitude higher as compared with the other species common in the area under study. Evaluation of measurement derived and computed values of certain radionuclide concentration ratios leads to the conclusion that the alga assimilates only radium from its environment.
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