What is the ALARA principle, and how does it guide management of occupational ionizing radiation exposure?

• A. As Low As Readily Achievable; guides PPE use.
• B. As Low As Reasonably Achievable; uses time, distance, shielding to minimize dose and optimize procedures.
• C. As Large As Reasonably Acceptable; increases dose.
• D. As Low As Readily Achievable; promotes only PPE.

Answer: (B)

ALARA means keeping radiation exposure As Low As Reasonably Achievable. It guides how to manage occupational ionizing radiation by pushing for the smallest dose that makes sense given practical factors like cost and benefit. In practice, this leads to reducing exposure through three main levers: spend less time near the source, keep as much distance as feasible from the source, and add shielding to attenuate the radiation before it reaches workers. Beyond these, ALARA involves a hierarchy of controls: engineering controls (containment, ventilation), administrative controls (work procedures, scheduling, training), and PPE used appropriately but not relied on alone. The decision process weighs the effort and cost of additional protections against the dose reduction achieved, aiming to stay well below limits while remaining reasonable.

The other options don’t fit because one uses the wrong wording and suggests focusing only on PPE; another would imply increasing exposure; and another mixes incorrect phrasing or scope.