engleski

The distribution or radioactive (3^H, 14^C) and stable (2^H, 18^O) isotopes in precipitation, surface and groundwaters during the last decade in Yugoslavia

The isotopic measurements (2^H, 3^H, 18^O) of precipitiation in Zagreb (since 1976) and Ljubljana (since 1981) in NW Yugoslavia show seasonal variations typical of the Northern hemisphere. Continuous measurements of tritium concentration in the Sava River ca 10 km upstream from Zagreb have been performed since 1976. Data show a smooth line without periodical changes, but a steady decrease is obvious. The sampling place is situated ca 30 km downstream from the Krko Nuclear Power Plant. No change in tritium concentration due to the operation of the power plant has been observed. A comprehensive program of monitoring of the 14^C activity in air CO_2 as well as in vegetables, cereals and tree-rings in the surroundings of the Nuclear Power Plant Krko has been carried out since 1984. The measurement of 2^H and 18^O in karst springs of the Korana River catchmet area (Plitvice National Park) gave a meteoric water line equal to δ 2^H = 7.9 δ 18^O + 8.5, which is typical of the NW part of Yugoslavia. A fairly constant concentration of 2^H and 18^O in spring water indicates a thorough mixing of water in the karst aquifers. The mean residence time (MRT) of karst water was determined by measuring monthly tritium activity of spring water. The MRT is very short, ranging between 1 and 4 years on average.

radiocarbon ; tritium ; stable isotopes ; precipitation ; groundwater

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