X-ray image intensifier with columnar crystal phosphor layer

Details X-ray image intensifier with columnar crystal phosphor layer X-ray image intensifier with columnar crystal phosphor layer

1988-03-11

1989-07-11

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313525, H01J 3150

Patent

active

048474827

ABSTRACT:
An X-ray image intensifier comprises a vacuum envelope having an input window, through which X-rays are incident on said vacuum envelope, an input fluorescent screen for converting the X-rays into light rays, a photoelectric layer for converting the light rays into electrons, an anode and a focusing electrode forming an electron lens for accelerating and focusing the electrons and an output fluorescent screen for converting the electrons accelerated and focused by the electron lens into a visible image. The input fluorescent screen includes a first phosphor layer having a first density and a second phosphor layer having a second density higher than the first density. The second phosphor layer is placed on that side of the first phosphor layer which faces the photoelectric layer. The thickness of the second phosphor layer is greater at the peripheral areas than the central part of the input fluorescent screen.

REFERENCES:
patent: 2743195 (1956-04-01), Longini
patent: 3716713 (1973-02-01), Levin
patent: 4740683 (1988-04-01), Noji et al.

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