engleski

INVESTIGATIONS OF 90SR ACTIVITY CONCENTRATIONS IN ANIMAL BONES IN CROATIA

The paper describes investigations of 90Sr activity concentrations in long bones of some domestic animals (cows, pigs and lambs) collecte d over the last ten years in the Republic of Croatia. These investigations are a part of an extended and still ongoing monitoring programme of radioactive contamination of human environment in Croatia. Bone is a critical organ for the accumulation of many radionuclides, including 90Sr, a highly toxic radionuclide, similar to calcium in its chemical behaviour and metabolic processes. It has been found that the 90Sr activity concentrations in bones differ between respective animal species, the highest activity concentrations being found in lamb bones. As the decrease of activity concentrations can be generally described by the exponential function, by fitting the measured data to the theoretical curve was estimated the ecological half-life of 90Sr in bones of respective species. In addition was investigated the relation between 90Sr activity concentrations in bones and fallout. The transient increases and decreases in 90Sr activity concentrations in bones can be partially explained by a variety of environmental physical factors that naturally fluctuate.

activity concentration; 90Sr; long bones; ecological half-life

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