An exposure device using depleted uranium as shielding must be leak tested how frequently?

The correct answer reflects the regulatory requirement that exposure devices utilizing depleted uranium for shielding must undergo leak testing every 12 months. This regulation is in place to ensure the safety of individuals working with radiation and to minimize the risk of exposure due to possible leaks from the shielding material. Regular testing is crucial because it helps identify any potential failures in the containment of radioactive materials. Such rigorous safety protocols are fundamental in maintaining a safe working environment in industries dealing with radiation sources. The annual testing frequency represents a balance between operational practicality and ensuring a high standard of safety. This requirement is part of broader regulatory frameworks aimed at protecting workers and the public from radiation hazards.