Which action best demonstrates ALARA in radiation safety?

• A. Increase exposure to determine dose-response.
• B. Use only PPE without shielding or distance considerations.
• C. Apply shielding, time, distance, and monitoring to minimize exposure.
• D. Eliminate all monitoring to speed workflow.

Answer: (C)

ALARA means keeping radiation exposure as low as reasonably achievable by applying practical controls to every part of the process—before, during, and after exposure. The key ideas are to minimize dose at the source and along its path: use shielding to block or reduce the radiation reaching a person, limit the time spent near the source to cut cumulative dose, maximize distance from the source since radiation intensity falls off with distance, and use monitoring to track actual doses and adjust practices accordingly. The option that includes shielding, reducing the time spent near the source, increasing distance when possible, and ongoing monitoring best demonstrates ALARA because it actively combines all protective measures to keep exposure low while still allowing necessary work to be done. The other choices fail because increasing exposure defeats the purpose of ALARA, relying on PPE alone ignores shielding and distance, and eliminating monitoring removes essential feedback that keeps exposures within safe limits.