Evaluation of actual level of Sr-90 and Cs-137 in urine as indicator for internal contamination of human body in the case of nuclear accident

In this work it was determined the urinary contamination with 90Sr and 137Cs as indicator of the exposure of population from Bechet zone to the risk of nuclear accident, created by C.N.E. Koslodui-Bulgaria. Two lots of persons were selected, the first from Bechet zone, situated within 30 km area from Koslodui, and the second from a central zone, Melinesti, situated far at 200-300km from Koslodui. Every lot was formed by 35 healthy persons, males and females, and was structured in this way: of 7 to 9 years old, of 13 to 14 years old, of 17 to 18 years old and after 25 years old. The results obtained and the conclusions that can be drawn about the distribution of these isotopes in urinary daily excretion function by age, sex or distance from C.N.E. Koslodui are presented below. (author)