X-ray image intensifier and method of manufacturing input screen

Details X-ray image intensifier and method of manufacturing input screen X-ray image intensifier and method of manufacturing input screen

1990-05-17

1991-07-02

Willis, Davis L.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313527, H01J 3150

Patent

active

050292471

ABSTRACT:
An X-ray image intensifier includes an input screen for converting incident X-rays into photoelectrons, and an output screen for converting the photoelectrons into visible light. The input screen includes a phosphor layer. The phosphor layer has a large number of columnar crystals of a phosphor which have end faces constituting a smooth surface facing the output screen. A low-refractive-index layer is formed on the phosphor layer and made of a material having a refractive index smaller than a refractive index of the phosphor, with respect to the light having a specified wavelength, at which the fluorescence of the phosphor is the most intensive. A photoemissive layer is formed directly or indirectly on the low-refractive-index layer.

REFERENCES:
patent: 4752681 (1988-06-01), Anno et al.
patent: 4847482 (1989-07-01), Kubo
patent: 4935617 (1990-06-01), Anno et al.

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