C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
31/126
C09K 11/46 (1980.01) C09K 11/42 (1980.01)
Patent
CA 1103441
LANTHANUM-GADOLINIUM PHOSPHATE X-RAY PHOSPHORS ABSTRACT OF THE DISCLOSURE X-ray phosphor compositions of the formula: La1-XGdxPO4 wherein x is from about 0.01 to about 0.5, when incorporated into conventional x-ray intensifying screen, improve the resolution, of the image in the resulting film. The lanthanum gadolinium phosphate under x-ray excitation has a line emission with a peak at about 312 nanometers. A solid state process wherein the respective rare earth oxides and ammonium orthophosphate are first heated together under controlled temperature conditions and then reheated with a suitable alkali metal phosphate flux', followed by a nitric acid treatment, enables the production of materials having particle sizes suitable for x-ray screens . Use of the lanthanum-gadolinium phosphate in screens in conjunction with conventional base films effectively eliminates distortion resulting from cross-over.
277940
Mathers James E.
Shaffer Francis N.
Gte Sylvania Incorporated
R. William Wray & Associates
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