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A COLLECTOR FOR BACK-SCATTERED ELECTRONS IN AN X-RAY TUBE

IP.com Disclosure Number: IPCOM000114542D
Publication Date: 2005-Mar-29
Document File: 6 page(s) / 44K

Publishing Venue

The IP.com Prior Art Database

Abstract

In one embodiment, a collector for back-scattered electrons in an X-ray tube, includes a body made of high conductivity graphite. The collector has one face brazed on to a frame, wherein the face is constructed from Copper. A heat exchanging part such as, an offset fin, porous metallic or porous graphite heat exchanger is disposed at a location adjacent to the face constructed from Copper. A graphite part having substantially high conductivity is attached on to the collector, for example, by brazing.

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A COLLECTOR FOR BACK-SCATTERED ELECTRONS IN AN X-RAY TUBE

FIELD OF THE INVENTION

[0001]               This invention relates generally, to collectors, and more particularly to, a collector for back-scattered electrons in an X-ray tube, especially, a mono polar X-ray tube.

BACKGROUND OF THE INVENTION

[0002]               An electron collector is a component typically implemented on a mono polar X-ray tube to collect back-scattered electrons from a target.  The X-ray tube window is typically made of a material having a low atomic number, such as Beryllium and is often attached to an electron collector.  About 40% of electrons generated by cathode, which represents 40% of tube power, rebound from Tungsten target surface as back-scattered electrons.  The back-scattered secondary electrons retain a significant amount of kinetic energy and when they impact the electron collector/ X-ray window, a significant amount of heat is generated.  Mono polar tube performance depends on the amount of back-scattered electrons absorbed by the electron collector and the radiative heat transfer from the target surface.

SUMMARY OF THE INVENTION

[0003]                In one embodiment, the collector includes a body made of high conductivity graphite.  The collector has one face brazed on to a frame, wherein the face is constructed from Copper.    A heat exchanging part such as, an offset fin, porous metallic or porous graphite heat exchanger is disposed at a location adjacent to the face constructed from Copper.  A graphite part having substantially high conductivity is attached on to the collector.

 

BRIEF DESCRIPTION OF THE DRAWINGS

[0004]                FIG.1 shows a front view of the collector with the oil flow circuit according to one embodiment of this invention.

[0005]                 FIG. 2 shows a top view of the collector according to one embodiment of this invention.

DETAILED DESCRIPTION OF THE INVENTION

[0006]                Various embodiments of this invention provide a collector for back-scattered electrons in an X-ray tube, especially in a monopolar X-ray tube in medical imaging.   However, the embodiments are not limited and may be implemented in connection with systems such as, for example, security scanners, industrial inspection systems. 

[0007]               FIG. 1 and FIG. 2 respectively show the front and top views of an electron collector according to one embodiment of this invention.  Accordingly, the collector includes a body made of high conductivity graphite.  The collector has one face brazed on to a frame, wherein the face is constructed from Copper.    A heat exchanging part such as, an offset fin, porous metallic or po...