What is the function of the metal housing in the tubehead?

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The metal housing serves as a protective, grounded enclosure for the high‑voltage components inside the tubehead. It surrounds the x-ray tube and the transformers, providing physical support and containing any stray electrical currents by connecting to earth ground. This grounding reduces the risk of electrical shock, interference, and fault currents reaching the operator, while the insulating oil handles cooling and insulation inside the assembly. The housing isn’t intended to store oil, nor does it act as a reflector for x‑rays; radiation is shaped by other parts and shielding around the tube window. So the main role is to protect the tube/transformers and ground high‑voltage components.