The variability of the radiobiological effect at the level of the organisms’s immunophysiological parameters, the content of chromosome abberations and serum hormones in the Chornobyl NPP accident cleaning up participants, which were exposed by different doses of ionizing radiation in different terms after the accident, was studied. Change of parameters, characterizing the functional condition of the immune and endocrine systems as well as increasing in the chromosome abberations frequency depend on the individual sensitivity to radiation in the accident cleaning up participants, which is determined by genetic heterogenicity.
