Health risk assessment of jobs involving ionizing radiation sources

The study included 75 subjects exposed to low doses of external ionizing radiation and 25 subjects from the control group, all male. The first group (A) consisted of 25 subjects employed in the production of technetium, with an average job experience of 15 years. The second group (B) consisted of 25 subjects exposed to ionizing radiation from enclosed sources, working in jobs involving the control of X-ray devices and americium smoke detectors, their average work experience being 18.5 years. The third group (C) consisted of 25 subjects involved in the decontamination of the terrain at Borovac from radioactive rounds with depleted uranium left over after the NATO bombing of Serbia in 1999, their average job experience being 18.5 years. The control group (K) consisted of 25 subjects who have not been in contact with sources of ionizing radiation and who hold administrative positions. Frequencies of chromosome aberrations were determined in lymphocytes of peripheral blood and compared to the control group. The average annual absorbed dose determined by thermoluminescent dosimeters for all three groups did not exceed 2 mSv. In the present study, the largest number of observed changes are acentric fragments and chromosome breaks. The highest occupational risk appears to involve subjects working in manufacturing of the radio-isotope technetium. Istrazivanjem je obuhvaceno 75 lica profesionalno izlozenih jonizujucem zracenju i 25 osoba iz kontrolne grupe; sve su osobe muskog pola. Ispitanici su bili izlozeni malim dozama zracenja (spoljna ekspozicija). Prvu grupu cini 25 lica koja rade na poslovima proizvodnje tehnecijuma, sa prosecnim radnim stazom od 15 godina. Drugu grupu cini 25 lica izlozena jonizujucem zracenju iz zatvorenih izvora, koja rade poslove kontrole rendgen aparata sa X-zracenjem i javljaca pozara u kojima se nalazi americijum, sa prosecnim radnim stazom od 18,5 godina. Trecu grupu cini 25 lica koja su radila na dekontaminaciji terena Borovac od radioaktivne municije sa osiromasenim uranijumom ostale od NATO bombardovanja 1999. godine, sa prosecnim radnim stazom od 18,5 godina. Kontrolnu grupu cini 25 lica koja nisu u kontaktu sa izvorima jonizujucih zracenja i koja rade finansijsko-ekonomske poslove. Ispitivana je ucestalost hromozomskih aberacija u limfocitima periferne krvi i uporedjivana u odnosu na kontrolnu grupu. Prosecna godisnja apsorbovana doza merena termoluminiscentnim dozimetrima za sve tri grupe nije prelazila 2 mSv. U ovom radu najv