The indices of the blood kinin system evaluated among residents of rig
id radiation control subjected to the effect of small doses of ionizin
g radiation. The revealed changes evidence activation of proteolytic s
ystem, that is manifested by a reduction of the prekallikrein and decr
ease of the inhibitor potential of the blood. Results indicate the nec
essity of developing therapeutic measures for the correction of the ab
ove disorders of the blood kinin system.