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Colony survival assay of PC3 and Caco-2 cells exposed to carbon ion or X-irradiation. (A–B) Survival fraction of PC3 (A) and Caco-2 (B) cells calculated using conventional clonogenic assays. The linear quadratic model was applied to experimental data. (C) Surviving fractions of clonogenic cells exposed to 2 Gy carbon ion or X-irradiation.
