Cerium activated yttrium gadolinium phosphate x-ray phosphors, p

Details Cerium activated yttrium gadolinium phosphate x-ray phosphors, p Cerium activated yttrium gadolinium phosphate x-ray phosphors, p

1977-07-14

1981-05-05

Dixon, Harold A.

Radiant energy

Invisible radiation responsive nonelectric signalling

Luminescent device

2523014P, G01J 158

Patent

active

042661374

ABSTRACT:
Cerium-activated yttrium gadolinium phosphate x-ray phosphors having a particle size of from about 4 to about 12 micrometers are prepared by solid state reaction techniques and followed by a firing in a reducing atmosphere to insure the cerium activator is in the plus 3 valence state. The x-ray phosphors can be represented by the formula Y.sub.1-a Gd.sub.a Ce.sub.x PO.sub.4 wherein a is a value between about 0.05 and about 0.3 and x is a value between about 0.005 and 0.25. The foregoing phosphors under x-ray excitation have a main band peak emission of about 355 nanometers and a main band width of about 15 nanometers. The x-ray screens employing the phosphors are conventional screens wherein the phosphor is disclosed upon a substrate which is suitable for x-ray intensifying screens.

REFERENCES:
patent: 3322681 (1967-05-01), Smith
patent: 3322682 (1967-05-01), Thompson
patent: 3925674 (1975-12-01), D'Silva
"Phosphors Based on Rare Earth Phosphates--", by R. C. Rapp, J. Electrochemical Society: Solid State Science, May 1968, pp. 531-535.
"X-ray Excited Optical Fluorescense of--", by D'Silva & Fassel, Analytical Chemistry, vol. 45, No. 3, Mar. 1973, pp. 542-547.
Fluorescent & Other Gaseous Discharge Lamps, by Forsythe & Adams, Murray Hill Books (1949), pp. 46-50.

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