hrvatski

90Sr u mlijeku sjeverozapadne Hrvatske

The program of radioactivity measurements and monitoring of the human environment in Croatia, carried out by the Radiation Protection Unit of the Institute for Medical Research and Occupational Heath in Zagreb, involve also investigations of radiostrontium in milk and milk products. Milk is a very important foodstuff and a critical food in respect to the presence and persistence of nuclides in the body. Because of its high calcium content, milk is used as a sensitive indicator for the presence of fission products in foods and in the environment. It is also an important route of entry of radiostrontium from fallout to man. Radiostrontium, a highly toxic radionuclide, is similar to calcium in its chemical behaviour, including its deposition in human bone. The paper describes investigation of 90Sr activity in milk collected over the period of six year at two locations in the north-western part of the Republic of Croatia. 90Sr was determined by extraction with tributyl phosphate. 90Sr was measured on basis of radioactive balance with its decay product 90Y, counted by low background level anti-coincidence shielded GM counter. In the Republic of Croatia, milk consumption of approximately 100 L per year/ person can potentially lead to the accumulation of significant radiation dose. The doses received from milk consumption are small, but owing to the long retention time of 90Sr in bone which can be the basis for its potential hazard, 90Sr level require continuous control and monitoring. Special emphasis should be given to children as the most vulnerable part of population.

radiostroncij; mlijeko; unos; efektivna doza

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