Studies on the radioactivity of marine fish have been carried out in the Central Laboratory for Radiological Protection since 1982. This report summarizes the results of ¹³⁷Cs determinations in the Baltic Sea fish in the years 1990-1995.
Samples were taken from southern region of the Baltic. All samples were analysed by gamma-ray-spectrometry.
The highest concentration of ¹³⁷Cs was found in 1992 in the flesh of flounder - 26.4 Bq/kg w.w., the lowest determined concentration was 6.7 Bq/kg w.w. The mean ¹³⁷Cs concentrations for the years 1990-1995 in 3 species: flounder, herring and cod were 11.9 ± 3.0, 11.0 ± 1.9 and 12.2 ± 2.0, respectively.
The presented data indicate certain stability of ¹³⁷Cs contamination of the Baltic Sea fish in the last 6 years.