Abstract
Quantitative distribution pattern of cesium-137 and strontium-90 was determined in a forest area after preliminary studies in different sites. Both radionuclides were found in the fallen leaves in the highest concentration and this fact can be reasonably explained by that the fall-out rates were the highest three years before this observation. About 80 and 63% of the total deposition respectively of cesium-137 and strontium -90 were found in the upper 5 cm layer of soil, 18 and 23% in the vegetation, of which 11.4 and 10.7% in the fallen leaves. Root absorption of strontium-90 by pine tree and shrub was considered at least two times higher than that of cesium-137.
