During a radiological leak, which exposure control guidelines are used to minimize contamination?

• A. Ionizing radiation, non ionizing radiation, half life
• B. Alpha particles, beta particles, gamma rays
• C. Time, distance, half life
• D. Time, distance, shielding

Answer: (D)

Time, distance, and shielding are the practical actions used to limit radiation exposure during a radiological incident. Keep exposure time as short as possible, maximize your distance from the source when feasible, and use appropriate shielding to attenuate the radiation. Together these controls reduce the dose you receive and help prevent the spread of contamination by limiting how much material you’re exposed to or bring into contact with. Other choices mix about radiation types or decay concepts not used as immediate protective actions, so they don’t provide the same direct, actionable guidance for reducing exposure and contamination.