Phosphor and radiation image storage panel containing the same
AssigneeFuji Photo Film Co., Ltd.
InventorTakashi Nakamura
Life of this patent
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Abstract
A cerium activated rare earth halophosphate phosphor having the formula (I): LnPO.sub.4.aLnX.sub.3 :xCe.sup.3+ (I) in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu; X is at least one halogen selected from the group consisting of f, Cl, Br and I; and a and x are numbers satisfying the conditions of 0.1.ltoreq.a.ltoreq.10.0 and 0<x.ltoreq.0.2, respectively. A process for the preparation of said phosphor, a radiation image recording and reproducing method utilizing said phosphor, and a radiation image storage panel employing said phosphor are also disclosed.
Claims12
A cerium activated rare earth halophosphate phosphor having the formula (I):
- LnPO.sub.4.aLnX.sub.3 :xCe.sup.3+ (I)
- in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu;
- X is at least one halogen selected from the group consisting of F, Cl, Br and I;
- and a and x are numbers satisfying the conditions of 0.1.ltoreq.a.ltoreq.10.0 and 0<x.ltoreq.0.2, respectively and exhibiting a higher stimulated emission upon excitation with a He-Ne laser of a wavelength 632.8 nm after exposure to X-rays at 80 KVp, than said phosphor wherein a is less than 0.1.
A radiation image storage panel comprising a support and a phosphor layer provided thereon which comprises a binder and a stimulable phosphor dispersed therein, in which said phosphor layer contains a cerium activated rare earth halophosphate phosphor having the formula (I):
- LnPO.sub.4.aLnX.sub.3 :xCe.sup.3+ (I)
- in which Ln is at least one rare earth element selected from the group consisting of Y, La, Gd and Lu;
- X is at least one halogen selected from the group consisting of F, Cl, Br and I;
- and a and x are numbers satisfying the conditions of 0.1.ltoreq.a.ltoreq.10.0 and 0<x.ltoreq.0.2, respectively and exhibiting a higher stimulated emission upon excitation with a He-Ne laser of a wavelength 632.8 nm after exposure to X-rays at 80 KVp, than said phosphor wherein a is less than 0.1.
Dependencies are inferred from the claim text.