Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device
Patent
1987-06-30
1988-12-20
Fields, Carolyn E.
Radiant energy
Invisible radiation responsive nonelectric signalling
Luminescent device
2503272, 25230145, G01T 110, C09K 122
Patent
active
047926910
ABSTRACT:
A method for recording and reproducing a radiation image comprising the steps of (i) causing a phosphor, which can be stimulated by light radiation, to absorb a radiation passing through an object, (ii) stimulating said phosphor with light radiation to release the stored energy as fluorescent light, and (iii) detecting said fluorescent light with light detecting means, is characterized by the fact that said stimulating radiation is in the range of the visible light and the detected fluorescent light is in the range of the infrared radiation. Infrared emitting photostimulable phosphors include barium or strontium sulfates or solid solutions thereof doped with alkali metal ions. A method for obtaining said phosphors comprises heating at a temperature of at least 600.degree. C. A radiation image storage panel includes phosphors which, upon stimulation with visible light, emit radiation in the range of infrared region.
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Tsuda et al "Fe-Activated FR Emit. Phosph.", Chem. Abstracts vol. 86, (1977) 86:64481r.
R. L. Calvert and R. J. Danby, Thermoluminescence and Radiophotoluminescence From Eu- and Sm-Doped CASO.sub.4, 1/3/84, 8 pages, Subject Classification 11 and 20.3; 13.4; 22.8.1, Phys. Status Solidi A 83, (1984) p. 597.
K. Takahaski et al, Journal of Luminescence, 31 and 32, 1984-Mechanism of Photostimulated Luminescence in Europium Doped Barium Fluorohalides.
Krawietz Florian
Morlotti Romano
Fields Carolyn E.
Hanig Richard
Litman Mark A.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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