No safe dose of ionizing radiation refers to which concept?

No safe dose of ionizing radiation refers to which concept?

• A. the linear no-threshold model (LNT)
• B. risk vs benefit
• C. as low as reasonably achievable (ALARA)
• D. effective dose limit

Answer: (A)

The statement reflects the linear no-threshold model, which says cancer risk increases linearly with any amount of ionizing radiation and there is no dose small enough to be risk-free. In this view, even the tiniest exposure carries some risk, and risks add up with total dose over time. That’s why safety practices assume no safe dose and focus on minimizing exposure. Other choices describe related ideas but not the specific concept about dose-response: - Risk versus benefit is about weighing harms against potential gains, not about how risk scales with dose. - ALARA (as low as reasonably achievable) is a practical principle to minimize exposure, operating under the LNT idea, but it’s not the concept that no safe dose exists itself. - An effective dose limit is a regulatory cap to protect people, not the fundamental relationship between dose and risk.

The statement reflects the linear no-threshold model, which says cancer risk increases linearly with any amount of ionizing radiation and there is no dose small enough to be risk-free. In this view, even the tiniest exposure carries some risk, and risks add up with total dose over time. That’s why safety practices assume no safe dose and focus on minimizing exposure.

Other choices describe related ideas but not the specific concept about dose-response:

• Risk versus benefit is about weighing harms against potential gains, not about how risk scales with dose.

• ALARA (as low as reasonably achievable) is a practical principle to minimize exposure, operating under the LNT idea, but it’s not the concept that no safe dose exists itself.

• An effective dose limit is a regulatory cap to protect people, not the fundamental relationship between dose and risk.