X-ray or gamma ray systems or devices – Source – Target
Patent
1998-07-01
2000-06-20
Bruce, David V.
X-ray or gamma ray systems or devices
Source
Target
378143, H01J 3510
Patent
active
060786442
ABSTRACT:
An x-ray target has a substrate of a carbonaceous material such as graphite which is secured to a rotary shaft so as to rotate therewith. A portion of outer peripheral surface of the substrate is covered by a target plate, while the other portion is covered with a thin iridium layer with thickness in a range between 50 .ANG. and 250 .ANG. so that the trapped gas species like H.sub.2, CO, CO.sub.2 can escape therethrough, and to retard the diffusion of ambient gas species into the substrate while the infrared emissivity of the underlying substrate is not lowered appreciably thereby.
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Day Mary E.
Delfino Michelangelo
Bruce David V.
Fishman Bella
Friedman Bradford L.
Ho Allen C.
Varian Medical Systems Inc.
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