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Measurements of 137Cs volumetric activity (VA) in coastal waters of the Baltic Sea (near Juodkrante) were carried out in 2005. The highest values occurred in springtime; later they decreased, and in the summer‐autumn period approximate homogeneous values of 137Cs varied in the range of 41–57 Bq/m3, and the lowest values were observed in autumn. Comparison of these values with analogous data obtained in 2003 and 2004 was carried out. The highest average annual value of 63 Bq/m3 is proved to be in 2004. Furthermore, that year the greatest 137Cs volumetric activity variations in the range of 49–91 Bq/m3 were observed. These variations are related to possible appearance of additional sources of radioactive contamination in the sea. Evidently, such sources did not exist in 2005, when a satisfactory coincidence of measured and calculated results was obtained.

COMPARISON AND ANALYSIS OF INVESTIGATION RESULTS ON VOLUMETRIC ACTIVITY OF 137CS AT THE BALTIC SEA COAST IN 2003–2005