Which of the following is a practice to ensure safety in radiation therapy settings?

In radiation therapy settings, ensuring safety is paramount due to the potential hazards associated with exposure to ionizing radiation. Each of the listed practices contributes significantly to maintaining a safe environment.

Using equipment only when necessary helps to minimize unnecessary exposure to radiation for both patients and staff. This ensures that the use of potentially hazardous materials is limited to cases where it is clinically justified, thereby reducing risk.

Performing regular safety audits of equipment is crucial for identifying and rectifying any issues that may arise. These audits help ensure that all machinery is functioning correctly, adhering to safety standards, and that preventive maintenance is performed. This proactive approach can catch potential failures before they pose a risk to patients or staff.

Limiting exposure by rotating staff frequently is a practice that helps manage occupational exposure to radiation. By changing staff shifts and positions regularly, no individual is exposed to high radiation levels for prolonged periods, thus minimizing their cumulative risk over time.

Together, these practices form a comprehensive safety strategy, which is why the answer that includes all these measures is deemed correct. Each practice addresses a different aspect of safety and collectively contributes to a safer radiation therapy environment.