What does ALARA stand for in radiation safety practice?

• A. Always Low And Radiation Avoidance
• B. As Low As Readily Achievable
• C. As Low As Reasonably Achievable
• D. As Low As Reasonably Achievable

Answer: (D)

ALARA means reduce radiation exposure to the lowest level reasonably achievable, while still obtaining the needed clinical outcome. The idea is optimization: keep doses as low as possible without compromising image quality, diagnostic value, or patient care.

This is done by applying dose-reduction measures across the workflow—engineering controls like shielding and dose-efficient equipment, administrative controls such as using the minimum necessary exposure and efficient procedures, and proper use of personal protective equipment when appropriate. The “reasonably achievable” part means we balance dose reduction with practical factors like cost, effort, and technology; we don’t chase zero exposure at any cost, but we also don’taccept unnecessarily high doses when meaningful reductions are feasible.