ABSTRACT
Two types of soils (Eutric Fluvisol and Chromic Luvisol) and two crops (wheat and cabbage) were investigated for determination of the transfer of 137Cs from soil to plant. Measurements were performed using gamma-spectrometry. Results for the soil characteristics, transfer factors of the radionuclides (TF), and conversion factors (CF) (cabbage/wheat) were obtained. The transfer of 137Cs was higher for Chromic Luvisol for both the plants. Statistically significant dependence of TF of 137Cs on its concentration in soil was established for cabbage. Dependence between K content in the soil and the transfer factor of 137Cs was not found due to the high concentrations of available K. Use of bioconcentration factor (BCF) (ratio between the activity concentration of a radionuclide in a reference plant to its concentration in another plant) is demonstrated and proposed for risk assessment studies.
Subject(s)
Brassica/metabolism , Cesium Radioisotopes/metabolism , Soil Pollutants, Radioactive/metabolism , Soil , Triticum/metabolism , Brassica/chemistry , Bulgaria , Cesium Radioisotopes/analysis , Environmental Monitoring , Food Contamination, Radioactive , Hydrogen-Ion Concentration , Potassium Radioisotopes/analysis , Potassium Radioisotopes/metabolism , Risk Assessment , Seasons , Soil/analysis , Soil Pollutants, Radioactive/analysis , Time Factors , Triticum/chemistryABSTRACT
Plasma toxicity and plasma exchange efficacy were studied in two groups of patients: I gr.--8 patients with various degree of disturbed renal function who did not need hemodialysis treatment; II gr.--9 patients treated by periodic hemodialysis. A biologic toxicity test was used together with the clinical, immunologic and biochemical indices as a criterion for plasma exchange efficacy. The test gives direct information for the total plasma toxicity which is of great advantage and helps in the decision for another plasma exchange.
