What role do total dose and dose rate play in radiation injury?

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The amount of injury from radiation is shaped by two factors: how much energy is delivered overall (the total dose) and how quickly it’s delivered (the dose rate). A higher total dose means more energy interacts with cells, causing more damage and more opportunities for lethal injury. When the dose is delivered quickly (high dose rate), there’s little time for cells to repair sublethal damage between successive energy deposits, so the damage accumulates and injury is greater. If the same total dose is given more slowly (low dose rate), cells can repair some of the sublethal damage between hits, reducing the net injury. This combination—more injury with higher total dose, and more injury with higher dose rate due to less repair time—matches the principle described.