The effects of radiation on SW48 and SW620 cells. A, surviving curves of cells after ionization-radiation. B and C, representative figures of Guava Nexin assay of SW48 cells, B is for cells without radiation while C is for cells with 1 Gy of radiation. D and E, representative figures of Guava Nexin assay of SW620 cells, D is for cells without radiation while E is for cells with 3 Gy of radiation. F and G, quantification of Guava Nexin assays, F for SW48, G for SW620, mean ± SD, (n = 3).