Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1990-07-10
1991-12-03
Hannaher, Constantine
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2504861, 378182, G03C 146
Patent
active
050702483
ABSTRACT:
The present invention refers to a cassette comprising a front element hinged on the rear edge thereof to a back element of the cassette and a first fluorescent intensifying screen fixed, in the interior of said cassette, to said front element and a second fluorescent intensifying screen fixed, in the interior of said cassette, to said back element of the cassette, to be used with a radiographic film situated between and in close contact with said screens.
The cassette is characterized by the fact that the first intensifying screen comprises a first radiation emitting phosphor and the second intensifying screen comprises a second radiation emitting phosphor, and in that said first radiation emitted by said first intensifying screen are in a first wavelength region of the electromagnetic spectrum and said second radiation emitted by said second intensifying screen are in a second region of the electromagnetic spectrum.
The cassette is for use with a combination of photosensitive elements for radiography formed by the pair of radiographic fluorescent screens and a double-side coated silver halide radiographic element. Each screen is arranged adjacent to each silver halide layer, each screen is capable of imagewise emitting radiation to which the adjacent silver halide layer is sensitive when imagewise exposed to X radiation and each silver halide emulsion layer is substantially insensitive to the radiation emitted by the opposite screen.
REFERENCES:
patent: 4513078 (1985-04-01), Sandrik et al.
patent: 4529647 (1985-07-01), Maeoka et al.
patent: 4630297 (1986-12-01), Lerma
patent: 4839243 (1989-01-01), Shimizu et al.
patent: 4893021 (1990-01-01), Bollen et al.
patent: 4997750 (1991-03-01), Dickerson et al.
patent: 5021327 (1991-06-01), Bunch et al.
Research Disclosure 19931, Nov. 1980.
Glick Edward J.
Griswold Gary L.
Hannaher Constantine
Kirn Walter N.
Litman Mark A.
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