.~.~ With X-ray window or secondary radiation screen
DEFINITION
Classification: 378/140
With X-ray window or secondary radiation screen:
(under subclass 121) Subject matter provided with means for absorbing secondary electrons and/or unwanted photons, and X-ray tubes having a window in the envelope of the tube which passes a broader spectrum of X-ray radiation than is passed
by the remainder of the envelope.
(1) Note. Included in this subclass, for example, are X-ray tubes having an envelope made of a glass which transmits only "hard" X-rays and which has a window made of a material that will transmit "soft" X-rays.
(2) Note. A typical secondary screen is a hood surrounding the target with an entrance aperture for primary electrons and an exit aperture for desired X-rays.
