A radiomodifying effect of the three types of laser radiation has been studied on HeLa cell culture. Low-intensity UV-radiation delivered as high repetition rate nanosecond pulses (the second harmonic of the copper vapours laser lambda = 271 nm) somewhat reinforces, and continuous low-intensity red radiation (He-Ne laser, lambda = 632.8 nm) of certain doses weakens the effect of 5 Gy gamma-radiation.

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