Which practice reduces exposure to gamma radiation?

• A. Increase distance
• B. Use shielding
• C. All of the above
• D. None of the above

Answer: (C)

Reducing gamma exposure relies on two effective controls: distance and shielding. Moving away from a gamma source lowers dose quickly because radiation intensity falls off sharply with distance (inverse square law). Using shielding adds material between you and the source, absorbing or scattering photons to reduce the amount that reaches you; the shielding effectiveness depends on the energy of the gamma rays and the material used (dense materials like lead or concrete are common choices, with the thickness tailored to the energy). Since both increasing distance and using shielding independently reduce exposure, applying either helps, and using both provides the greatest protection. All of the above is correct.