Tritium and radiocarbon variations of water resources in the Ignalina NPP region

Presented data are used for estimation of radioactive liquid outflow of the Ignalina NPP and for investigation of different geohydrodynamical processes. Also there is drawn a radioecological conclusion that the tritium, namely, among all radionuclides is scattered on the largest scale in the Ignalina NPP environment. The highest tritium amount getting into lake Drukshiai was in 1987 (1.3 TBq) and in 1989 (0.9 TBq). The highest tritium amount getting into groundwater was in 1989 (0.9 TBq). The examined variations of radiocarbon are close to global ones with exemption of one observation borehole and lake Bliuvaklis where episodically radiocarbon concentration increases. Periodically tritium and radiocarbon concentrations are studied in the operation boreholes of Visaginas town water intake. Here the observed variations are close to those conditioned by global and geohydrodynamical processes. (author)