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Bristol Instruments, Inc. - 872 Series High-Res 4/24 LB
Photonics Dictionary

x-ray image intensifier

An image intensifier that consists of an evacuated tube with a large input phosphor screen at one end. The phosphor screen is in contact with a light-sensitive photocathode that emits electrons. These are, in turn, focused by an electron lens onto a small phosphor screen where a very bright image of the original x-ray picture is produced.
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