The value of the photoreactivable component in E. coli Bs-1 cells exposed to densely and sparsely ionizing radiations.

The dependence of the photoreactivation effect in E. coli Bs-1 cells on LET and energy of sparsely ionizing radiation was studied. The photoreactivation was shown to be absent after densely ionizing radiation (alpha-particles of 239Pu; fast neutrons En = 0.85 MeV) and after sparsely ionizing radiation with energies below 200 keV. In those cases where photoreactivation took place, the photoreactivable sector was found to increase with the voltage of the radiation.