INFLUENCE OF SOIL CHARACTERISTICS ON THE UPTAKE OF Ce-144,

The soil special features as a sorbent, its complicated composition and the differences in its characteristics impose the necessity of a research on the uptake of certain radio-isotopes by the plants, cultivated on the most typical soil types of Bulgaria. Carrying this goal a series of cultivation vegetative experiments on fi ve different soil types, with wheat, bean, spinage, turnip and alfalfa were made. After the analysis of the results of the vegetation experiments could be concluded that the transfer of Ce-144, Ag-110m, Sb-125, Ru-106 from the soil into the plants depends on a high extent on the soil characteristics, as the accumulation in the different plants organs considerably differs. After the so made correlation analysis, it was found out the existence of functional dependence between the coeffi cients of transfer for the researched radio-active isotopes and some soil characteristics as pH, consistence of humus, concentration of exchangeable Ca and Mg in the soil, which all is presented below in this research.