Figure 4
From: Survival of tumor cells after proton irradiation with ultra-high dose rates
Colony formation after irradiation with pulsed and continuous proton beams. Indicated is relative survival (surviving fraction, SF) of HeLa cells after irradiation with pulsed (SF P, open square) or continuous (SF C black square) proton beams at 3 Gy. Mean and SD of 3 independent experiments in 3 different beam times. Reference: x-ray irradiation (SF X, black triangles), mean and SD of 2 independent experiments.