RESUMO
The specific activity of 90Sr in milk and vegetables for the last 15 years does not exceed the permissible level in Ukraine outside the Chernobyl exclusion zone. Exceeding the acceptable level of 90Sr is registered only in food grain. Specific activity of 90Sr in grain, which is produced in the high contaminated areas of the Kiev region, nowadays may reach 60-70 Bq/kg, which exceeds the permissible level of 20 Bq/kg for bread-grain. The part of 90Sr activity in the biologically available form has reached its maximum values for the post-accidental period due to the fuel particle dissolution. Contamination of grain with this radionuclide has slowly decreased in recent years. Values of concentration ratios and aggregated transfer factors of 90Sr from soil to rye, oat and winter wheat grain are inversely proportional to the exchangeable calcium content in soil. The transfer factors and dependences are in good accordance with those that have been obtained in our previous works and with generalized data of the IAEA for sandy soils. Application in Ukraine of such countermeasures as liming, fertilizing and manuring makes it possible nowadays to produce grain that meets the requirements of hygienic regulations on the 90Sr content in bread-grain.