ANALYSIS OF DOSIMETRIC INFORMATION IN THE STATE REGISTER OF PERSONS AFFECTED FROM THE DISASTER AT THE CHERNOBYL NUCLEAR POWER PLANT

Background. Knowledge of the accumulated individual dosimetric information is important for the correct planning of radiation-epidemiological and dosimetric studies. Aim. Assessment of available data on exposure doses to the affected population registered with the State Register. Material and methods. Statistical analysis of data from dosimetric block of the State Register in groups of primary registration (GPR). Results. In the dosimetric block of the State Registry, the total amount of data on radiation doses is 559,674 values, of which 96.3% are doses of internal and X-ray medical exposure. More than 95% of the data are doses for GPR1-4. The median dose of external exposure in 1986 was 45.7 [17.5; 91.0] mSv (48.0 [19.15; 96.75] mSv in GPR1 and 37.0 [16.25; 56.52] mSv in GPR3; p=0.02). The highest doses absorbed in the thyroid gland were calculated in May 1986 and were observed in the evacuated population (63.5 [19.5; 89.5] mSv). In the liquidators and the population classified as GPR3, the median doses were 30.0 [16.0; 54.0] mSv and 37.0 [19.0; 80.0] mSv, respectively. Conclusions. The most promising for epidemiological studies is the use of individualized doses calculated in the laboratory of radiation protection of the State Institution "Republican Scientific and Practical Center of Radiation Medicine and Human Ecology", as the most complete in terms of quantity and large dose gradient.