Which factors help reduce exposure to gamma radiation?

• A. Time and distance only
• B. Shielding only
• C. Time, distance, and shielding
• D. None of these

Answer: (C)

Reducing gamma exposure comes from using three protective strategies together: cut the time you spend near the source, increase your distance from it, and place shielding between you and the source. Time matters because the dose you receive accumulates with exposure duration, so spending less time near the source reduces the dose in a straightforward, proportional way. Distance is especially powerful due to the inverse-square relationship: even a modest increase in distance can dramatically lower the dose because the intensity falls off rapidly with distance. Shielding works by attenuating the gamma photons as they pass through a barrier; more shielding or higher-density material reduces the photons reaching you.

Using all three together gives the greatest reduction in exposure, so the best approach is to apply time, distance, and shielding.