DYNAMICS OF 137Cs TRANSFER AND CONCENTRATION FACTORS AND RATIOS IN GRASS OF NATURAL MEADOWS ON PEAT-BOG SOILS IN THE EARLY PERIOD AFTER IMITATION OF THE RADIOACTIVE FALLOUT

Results of the small-field experimental study of the dynamics of biological availability of freshly added standard radioactive solution of Cs-137 in peat-bog soil are presented. The initial values of the Cs-137 concentration ratios CR(t) and transfer factors TF(t), in the aboveground phytomass of natural meadow grass vegetation in peat-bog soils in the real soil-climatic conditions of Western Polissya were determined. Based on the results of the field and laboratory studies, the values of fast and slow periods of the ecological half-reduction (T-e(f) and T-e(s) , respectively) of CR and TF of radioactive cesium in the studied soils were estimated. The model for prediction of the dynamics of CR and TF of radioactive cesium into natural meadow grass vegetation from peat-bog soils with its abnormal high biological availability was proposed.