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SUR LA RADIOACTIVE DE L'EAU DE MER DANS LA BAIE DE MAMAIA
PENDANT LA PERIODE 1986-1992

V. Patrascu

Institut Roumain de Recherches Marines Constanta 

Abstract
This paper reviews the gamma measurements of sea water radioctivity
in Mamaia Bay for a recent lapte of time and estimates the evolution
of the radionuclides concentrations as compared to Chernobyl moment
and their present level as compared to the previous "clean" years.
We have noticed 40K (a few Bq/1), 228Ac and 226 Ra (of the order of
10-1, 10-2 Bq/1) for their contributions to the natural radioactivity.
The fission and activation products have increased the inventory of
radionuclides from the environment (54Mn, 60Co, 106Ru, 110mAg, 125Sb,
134Cs, 137Cs). The natural processes from the marine environment 
diminish that increase, their concentration had low values in 1992
(a few tens of mBq/l for 137Cs). The paper includes interpretation
possibilities and admissibility criteria of radiation exposition
levels. Mamaia could be the pretext for presenting the general
tendency of the radionuclides fund observed along the Romanian
littoral.