Effects of low radiation doses on the chinese hamster cells

The induction of cytogenetic damages after irradiation with single dose of γ-rays (0,1-2 Gr) has been studied. The nonlinear curve is shown for the induction of chromosome aberrations, detected by anaphase method. After irradiation in S-stage of the cell cycle at dose below 0.2 Gr the cells were more radiosensitive than after irradiation with doses 0,3-2 Gr. Between the phases of high radiosensitivity and radioresistance the reversal dose-effect relation was observed. This phenomenon was not marked for the cells after irradiation in G2-stage of the cell cycle. It is possible, these results could reflect an induced radioresistance at low dose of irradiation