Patent ID: 7206380

Claim:
An X-ray apparatus comprising: a rotation-anode type X-ray tube which is configured such that a rotatable anode target and a cathode that is disposed to be opposed to the anode target are accommodated within a vacuum envelope; 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 which is provided near at least a part of the rotation-anode type X-ray tube, and through which a water-based coolant is circulated, the water-based coolant having an amount of dissolved oxygen comprising 5 mg/liter or less at 25° C.; and a cooling unit including a circulation pump and said water-based coolant, 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.