RADIONUCLIDES' CONTENT IN FOREST ECOSYSTEM LOCATED IN SOUTH-WESTERN PART OF SERBIA

The re sults of the gamma-spec tro met ric mea sure ments in a 16500 ha large re gion of south-western Serbia, are presented. Activity concentrations of 40K, 137Cs, and 210Pb in dif fer ent de cid u ous and ev er green trees in the re gion are in ves ti gated. For all the in ves ti gated iso topes, there is a ten dency that, on av er age, the low est ac tiv ity con cen tra tions were found in tree stems, then in leaves, while the high est ones were in the soil. Sta tis ti cal anal y sis did not show any dif fer ences be tween ac tiv ity con cen tra tions of leaves and nee dles, show ing that both leaves and nee dles could be equally well used as a biomonitors.