Radioactivity of fishes in the Hungarian reach of the river Danube

In connection with the National Nuclear Power Plant Programme, author studied the 90Sr and 137Cs activity concentration in various Danube fish species /bream, carp, perch pike, nose carp, breamflat, ide/. Between 1979 and 1982 ground-level investigations were performed in the area of Paks. Samples taken from the surroundings of the operating Paks Nuclear Power Plant will regularly be measured in 1983. After the radiochemical separation of 90Sr from fish bone and 137Cs content from muscles, activity concentration data obtained from the measurement of beta-activity refer to mBq/kg wet-weight. The results of ground-level measurement do not show any significant difference as for sampling sites, seasons and species of fishes. Elaboration and evaluation of samples taken during the first half of 1983 will be completed by July. The paper contains two tables. (Author)