In the context of radiation protection philosophy, the term used to describe that any amount of radiation carries some risk of genetic effects is:

• A. Threshold
• B. Non-threshold
• C. Linear
• D. Non-linear

Answer: (B)

The concept being tested is that there is no dose of radiation that is guaranteed to be free of genetic risk. This is the non-threshold view: any amount of exposure carries some probability of causing genetic effects. A threshold would imply a safe, zero-risk dose below which effects can’t occur, which this statement rejects. The terms linear and non-linear describe how risk changes with dose, not whether risk exists at all; a linear relationship means risk increases proportionally with dose, while a non-linear relationship changes the rate of increase at different dose levels. In practice, regulatory thinking often uses a linear no-threshold approach to estimate risk at very low doses, aligning with the idea that there is some risk no matter how small the exposure.