| 摘要 |
FIELD: physics.SUBSTANCE: pulsed X-ray tube comprises a metal housing in form of a hollow cylinder, one base of which is connected to the larger base of an insulator which is made in form of a hollow truncated cone and is placed outside the housing, and the other base of the housing is connected to an X-ray exit window and a cathode mounted on a holder, having axially symmetric openings relative to an anode which is made in form of a cylindrical rod which changes into a cone and is directed towards the window, an anode lead which passes on the axis of the device in the cavity of the insulator and is connected to its smaller base. The holder is in form of a cup, in the cylindrical part of which through-grooves are uniformly formed around its periphery and perpendicular to the bottom, said grooves changing into notches in the bottom of the cup; the cathode is made of polyacrylonitrile carbon fibres, arranged radially relative to the axis of the device and attached to the bottom of the cup, for example, by a thin metal ring using spot welding, wherein the faces of some ends of the polyacrylonitrile carbon fibres form a boundary of the cathode opening, and the other ends are clamped in notches between the bottom of the cup and the outer surface of the housing.EFFECT: obtaining radiation in the soft range, which provides high image contrast when operating with objects of different optical density while maintaining X-ray optical parameters during operation.1 dwg |
