PULSE-TYPE X-RAY TUBE Russian patent published in 2014 - IPC H01J35/00 

FIELD: measurement equipment.

SUBSTANCE: invention refers to X-ray equipment and can be used for the development of pulse-type X-ray tubes to be applied in small X-ray apparatuses. A pulse-type X-ray tube comprises a metal casing in the form of a hollow cylinder with one its base being connected to the greater base of an insulator which is made as a hollow truncated cone and set beyond the casing, and the other casing base being connected to a X-radiation output window and a cathode, a pointed anode passes through the hole in the centre of the cathode perpendicular to the latter in the direction to the window. The tube is fitted by the first protective shield presented as a cup formed by a hollow cylinder with one its base being connected to the casing and the other - to the greater base of the hollow truncated cone while the smaller base of the latter with a hole in the centre is turned to the smaller base of the insulator. The pointed anode terminal passes through the hole in the first protective shield to the insulator cavity and is connected to its smaller base. The second protective shield, for example, made as a disk, coaxial to the pointed anode and installed in the same volume with it with the volume being limited by the first protective shield, and diameters of the hole in the cathode D₁, of the second protective shield D₂, of the hole in the first protective shield D₃, distance between the upper surface of the second protective shield and the plane of the cathode location S₁, distance between the upper surface of the second protective shield and the outer surface of the smaller base of the hollow truncated cone at the first protective shield S₂ are interrelated according to the following ratio (D₂-D₁)/S₁≥(D₃-D₂)/S₂, the cathode is made from the material having surface nanostructure, for example, from polyacrylonitrile carbon fibres set on a substrate and directed by the radius perpendicular to the device axis, the end faces of the carbon fibres form the border of the cathode hole and are fixed on the substrate by, for example, a metal disk in the form of a ring by spot welding.

EFFECT: provision for X-radiation in soft range ensuring high contrast image when working with the objects of different optical density.

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