Phosphor and radiation image storage panel containing the same
First Claim
Patent Images
1. A cerium activated rare earth halophosphate phosphor having the formula (I):
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space="preserve" listing-type="equation">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≦
a≦
10.0 and 0<
x≦
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.
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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≦a≦10.0 and 0<x≦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.
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Citations
12 Claims
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1. A cerium activated rare earth halophosphate phosphor having the formula (I):
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space="preserve" listing-type="equation">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≦
a≦
10.0 and 0<
x≦
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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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):
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space="preserve" listing-type="equation">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≦
a≦
10.0 and 0<
x≦
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. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification
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Current AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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Original AssigneeFuji Photo Film Co Limited (Fujifilm Holdings Corporation)
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InventorsNakamura, Takashi
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Primary Examiner(s)Cooper, Jack
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Application NumberUS06/760,035Time in Patent Office638 DaysField of Search252/301.4 P, 252/301.4 H, 428/691US Class Current428/691CPC Class CodesC09K 11/7779 with halogensG21K 4/00 Conversion screens for the ...
