Which of the following is NOT one of the three basic principles of radiation protection?

Which of the following is NOT one of the three basic principles of radiation protection?

• A. Justification
• B. Optimisation
• C. Time, Distance, Shielding
• D. Limitation

Answer: (C)

The main idea being tested is the distinction between foundational principles and practical protection actions. The three fundamental principles guiding radiation protection are justification (a procedure should be performed only if the benefits outweigh the risks), optimisation (keep exposures as low as reasonably achievable), and dose limitation (establish and adhere to dose limits for workers and the public). Time, Distance, Shielding describes concrete protective measures used to reduce exposure during imaging. While these approaches are essential for implementing protection, they are techniques to achieve lower doses rather than the overarching criteria that determine whether a procedure should be done or how exposure is managed in principle. That’s why this option is not one of the three basic principles. So the correct choice identifies a protective action set rather than a core principle, while justification and optimisation correspond to the decision-making framework, and limitation corresponds to regulatory dose thresholds.

The main idea being tested is the distinction between foundational principles and practical protection actions. The three fundamental principles guiding radiation protection are justification (a procedure should be performed only if the benefits outweigh the risks), optimisation (keep exposures as low as reasonably achievable), and dose limitation (establish and adhere to dose limits for workers and the public).

Time, Distance, Shielding describes concrete protective measures used to reduce exposure during imaging. While these approaches are essential for implementing protection, they are techniques to achieve lower doses rather than the overarching criteria that determine whether a procedure should be done or how exposure is managed in principle. That’s why this option is not one of the three basic principles.

So the correct choice identifies a protective action set rather than a core principle, while justification and optimisation correspond to the decision-making framework, and limitation corresponds to regulatory dose thresholds.