What is the primary function of protective housing around an X-ray tube?

• A. It determines the tube current.
• B. Shielding designed to limit the exit of x-rays to the window.
• C. It cools the anode by circulating oil.
• D. It converts heat into light energy.

Answer: (B)

The protective housing around an X-ray tube is mainly a shielding container that limits where X-rays exit. It’s lined with lead to absorb stray photons and ensure the beam leaves primarily through the window toward the patient, while protecting people and surroundings from leakage radiation. The housing also provides mechanical support and insulation, and it contains cooling oil to help remove heat, but the primary function remains shielding and beam containment. The tube current is set by exposure factors, not by the housing, and the housing does not convert heat into light energy.