X-ray tube with a low-temperature emitter

Details X-ray tube with a low-temperature emitter X-ray tube with a low-temperature emitter

1996-04-04

1997-12-30

Church, Craig E.

X-ray or gamma ray systems or devices

Source

Electron tube

378138, H01J 3506

Patent

active

057039240

ABSTRACT:
An x-ray tube has an anode and an electron emitter from which an electron beam emanates, the electron beam impinging the incident surface of the anode in a focal spot from which a useful x-ray beam emanates. At least in the region of its electron-emitting surface, the electron emitter is formed of an electron-emitting material that has a lower electron affinity than tungsten (a low-temperature emitter). Further, an apertured diaphragm at anode potential is arranged between the electron emitter and the anode and through which the electron beam passes. As electron-emitting material, the electron emitter contains lanthanum hexaboride (LaB.sub.6) or an alloy of the systems iridium/cerium (Ir/Ce) or iridium/lanthanum (Ir/La) systems.

REFERENCES:
patent: 4060731 (1977-11-01), Pissi
patent: 4145616 (1979-03-01), Tanabe
patent: 5142652 (1992-08-01), Reichenberger
patent: 5170422 (1992-12-01), Fiebiger

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