Peculiarities of radionuclide fall-out from the Ignalina APP, their accumulation and migration in the Drukshiai lake ecosystem

After the investigation of radioecological situation and the peculiarities of the radionuclide migration in the Drukshiai lake it is established that concentrations of 137Cs, 134Cs, 54Mn and 60Co in the ground deposition depending on collecting time and place are fluctuating as follows: from 100 to 400, from 6 to 96, from 6 to 204 and from 3 to 148 Bq/kg dry weight: in water plants - from 7 to 95, from 2 to 24, from 7 to 140 and from 9 to 140 Bq/kg dry weight. The largest concentrations of 54Mn and 60Co in ground deposition were detected in the warm water throwing out zone and in the canal of the industrial-rain sewerage that falls into the lake Drukshiai. The largest concentration of tritium were detected in the Skripkos lake (320 TU) and in the Vosylishkes rivulet (240 TU) that have its source in the Skripkos lake and falls into the Drukshiai lake. The concentration of tritium in the Drukshiai lake is 3-4 times higher than the distribution of tritium in the world. (author). 3 figs., 1 ref