[The criteria for forming risk groups among the population exposed to ionizing radiation after the accident at the Chernobyl Atomic Electric Power Station].

Studied were particular features of peripheral blood, certain immunological and biochemical indices under long-term exposure of human body to radiation after the accident at the Chernobyl Nuclear Power Plant. The study comprised 5578 individuals. The examinees were liquidators of the Chernobyl accident sequels (n = 1052), inhabitants of Pripyat evacuated from the town (n = 850), the Kiev SSBT primary donors (n = 1738).