This paper present the results of investigations of the level of contamination by radioactive isotopes of grass and soil of the Polish and Ukrainian Roztocze area. Heavy metal contents in soil were also measured. The highest level of radioactivity was found in the Northwestern part of Roztocze which may be explained by the close vicinity of industrial centers. The presence of caesium gave from 0.6 to 22% of the total soil activity at Polish side and from 1.5 to 11% at Ukrainian. The Chernobyl nuclear power plant failure is the main source of radioactive contamination of soil. For most samples 100% of this caesium came from this source. The mean 4nK contents made 57% of the total radioactivity in Polish Roztocze and 54% in Ukrainian. Radionuclides of thorium and uranium series gave 20 to 35% of total activity. The activity of 4(,K in grass gave about 80% of the total radioactivity in Polish Roztocze and 73% in Ukrainian. Other radioisotopes present in grass are mainly 7Be and 137Cs. Heavy metal contents in plough land soil universally, except two points, do not exceed acceptable levels.
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