Figure 4

Experimental γ-H2AX foci yields as a function of dose following exposure to X-rays and to the mixed neutron – photon field. Average foci yields above background level (ΔFoci per cell) scored from 2D images at 30 minutes (black) and 24 hours (red) after exposure are shown as a function of increasing dose for X-rays (a) and for the mixed neutron – photon field. (b) Errors are given as standard error of the mean (SEM) for the different biological and technical replicates. Best fit curves to experimental data are also shown, see the text for further details.