Which statement describes the effects of ionizing radiation on cells?

• A. Pass through a cell without causing damage
• B. Kill the cell
• C. Lead to permanent changes in tissue which may result in demonstrable biological injury
• D. All of the above

Answer: (D)

Ionizing radiation interacts with cells in multiple ways, depending on dose and cellular context. It can pass through a cell without causing damage in some cases, especially at low doses or when energy is not deposited in critical targets. It can also kill the cell if the damage is severe enough to disrupt essential processes or DNA. Even when the cell survives, the energy can produce DNA or chromosomal changes that become permanent alterations in tissue, potentially leading to observable biological injury over time. Because all of these outcomes are possible, the statement that includes immediate, lethal, and permanent tissue effects best describes how ionizing radiation affects cells.