In standard diagnostic room design, the primary protective barrier in the wall extends to what height?

• A. 5 feet
• B. 7 feet
• C. 9 feet
• D. 10 feet

Answer: (B)

The main idea here is that the barrier is placed to intercept the primary X-ray beam and protect anyone who might be standing near the wall during exposure. In a standard diagnostic room, this primary protective barrier is built tall enough to cover the operator’s typical standing height and any slight reach over the patient. That height is seven feet above the floor, providing ample clearance for the beam path while not requiring extra, unnecessary height. A barrier only five feet high could allow the beam to reach the operator’s head in common working positions, while nine or ten feet is more than what is needed for standard rooms. So, seven feet is the standard height.