X-ray tube with enhanced small spot cathode and methods for...

Details X-ray tube with enhanced small spot cathode and methods for... X-ray tube with enhanced small spot cathode and methods for...

2008-09-04

2010-02-02

Kiknadze, Irakli (Department: 2882)

X-ray or gamma ray systems or devices

Source

Electron tube

Reexamination Certificate

active

07657003

ABSTRACT:
An x-ray source produces a well-defined electron beam, without an undesirable halo. The x-ray source includes a housing, a cathode disposed within the housing, an anode spaced apart from the cathode for accelerating electrons emitted from the cathode and an x-ray emitter target disposed within the housing and spaced apart from the cathode for impact by the accelerated electrons. The cathode includes a passivation layer over only a portion of the area of the cathode, leaving an emission portion of the cathode that is not passivated. The passivation layer reduces or prevents emissions from the passivated portion of the cathode, thereby preventing a halo, which would otherwise be produced by lower-level emissions from the portion of the cathode that surrounds the emission portion of the cathode.

REFERENCES:
patent: 6320932 (2001-11-01), Dinsmore
patent: 7236568 (2007-06-01), Dinsmore et al.
patent: 2005/0136185 (2005-06-01), Ramanathan et al.
TWX, LLC, “twX Forty KiloVolt X-Ray Tube,” twX product description web page, http://www.twxray.com/products.cfm, pp. 1-2, (2006).

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