This is Episode 5, Measuring Survival: Clonogenic Assays.In our last episode, we explored the different ways cells can die after radiation – apoptosis, necrosis, mitotic catastrophe, and others. But in radiation oncology, the ultimate goal isn't just causing immediate cell death, it's preventing tumor cells from dividing and regrowing. Today, we'll focus on the "gold standard" methods used in radiobiology to measure this loss of reproductive capability, both in the lab dish and within living organisms.