Patent ID: 7391852

Claim:
An X-ray apparatus comprising: a rotation-anode type X-ray tube configured such that a rotatable anode target and a cathode, disposed opposite to the anode target, are accommodated within a vacuum envelop; a stator which generates an induction electromagnetic field for rotating the anode target; a housing which accommodates and holds at least the rotation-anode type X-ray tube; a circulation path, provided near at least a part of the rotation-anode type X-ray tube, through which a water-based coolant is circulated; and a cooling unit including a circulation pump, which is provided at a position along the circulation path and forcibly feeds the water-based coolant, and a radiator which radiates heat of the water-based coolant, wherein the circulation path includes a path formed between an inner surface of the housing, having at least a part which is formed of lead, and the vacuum envelope, having a surface that has at least a part of which is formed of an iron alloy, and wherein the inner surface of the housing is coated with a coating member to prevent contacting with the water-based coolant, and wherein the coating member is an organic coating.