Data on the <$E nothing sup 90 roman Sr> influence on the superficial potential (SP) of human blood erythrocytes and neutrophils are represented. The irradiation dose rate in a range from 0,5 to 50 nGy/h did not change SP of cells. Further, a dose rate rise induced a lowering of SP of cells depending on the dose rate (by 20 % to 30 % for 0,5 and 5 uGy/h, accordingly). Absorbed dose effects of <$E beta>-radiation with maximum inactive dose rate (50 nGy/h) are investigated for neutrophils. It is shown that, in a range of absorbed doses from 50 to 300 nGy, SP remained on the level of unirradiated control. The further increasing of absorbed doses up to 1 uGy induced a reliable dose-independent lowering of SP by 20 - 26 %. Thus, the findings indicate the high sensitivity of blood cell SP to ionizing radiation and the possible mechanisms of chronic influence of the small radiation doses on organism.

• Жирнов Віктор Валентинович (біологічні науки)

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