engleski

LONG-TERM INVESTIGATIONS OF RADIACTIVE MATTER IN THE AIR IN THE CITY OF ZAGREB

The activity concenrations of radioactive matter in the Zagreb have been manifesting the constant exponetial decrease ever since early 1960s. The Chernobyl nuclear accident caused a major increase in Zagreb air radioactivity only in 1986, which over next few years quickly decreased pre-Chernobyl values. However, due to changing meteorological conditions at that time, resulting in very complex dispersion pattern of Chernobyl debris over Europe, major part of Croatia have been initially unaffected by the plumes of contaminated air.The mean residence time of 90Sr and 137Cs in fallout are estimated for respective pre-Chernobyl and post-Chernobyl periods.Despite of constant presence of radioactive matter in the Zagreb air, in the observed period activity concentration values never exceeded the legal limits. Consequently, the doses incurred by 90Sr and 137Cs by inhaling the polluted air after the Chernobyl accident are very small

radioactivity; 90Sr; 137Cs; Chernobyl accident; dose

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