What are the three keys to radiation safety?

• A. Time, Distance, Lead shielding
• B. Time, Distance, Shielding
• C. Distance, Exposure, Lead
• D. Time, Exposure, Distance

Answer: (A)

Managing radiation exposure hinges on three protective ideas: reduce time, increase distance, and use shielding. Cutting the time you’re exposed lowers the total dose directly, since exposure accumulates with time. Increasing your distance from the source makes a big difference due to the inverse square relationship—the farther away you are, the lower the dose you receive. Shielding between you and the source further reduces exposure; lead shielding is a common and effective choice in medical settings because its high density and atomic number absorb X-ray photons well, protecting workers and patients. Together, these three principles form the best framework for minimizing radiation dose in practice.