US6228286B1
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Class of high energy detecting phosphors
Assignee: Agfa HealthCare NV
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Filing: 1995-04-12
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Granted: 2001-05-08
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Expires: 2015-04-12
Abstract
Abstract An elpasolite phosphor is provided corresponding to the general formula: A 2−y B 1+y Me 3+ X 6 :xD wherein: A=a monovalent ion B=a monovalent ion A is different from B Me 3+ =a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4. An elpasolite phosphor corresponding to the general formula above is especially useful in the production of prompt emitting X-ray screens and in the production of X-ray energy storage screens.
Inventors
- 👤 Paul Leblans
- 👤 Peter Willems
- 👤 Luc Struye
- 👤 Johann-Martin Spaeth
- 👤 Thomas Pawlik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:56
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G03C5/17; C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/615; C09K11/616; C09K11/62; C09K11/626; C09K11/628; C09K11/74; C09K11/7428; C09K11/7435; C09K11/77; C09K11/7715; C09K11/7719; C09K11/772; C09K11/7728; C09K11/7732; C09K11/7733; C09K11/7766; C09K11/7772; C09K11/7773; C09K11/7783; C09K11/779; C09K11/7791; G21; G21K; G21K4/00; G21K2004/06
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
162 words
A method for recording X-rays comprising the steps of i. exposing a recording element comprising an X-ray intensifying screen in combination with a photosensitive material to X-rays, ii. recording the light emitted by said X-ray intensifying screen in said photosensitive material, wherein said X-ray intensifying screen comprises an elpasolite phosphor corresponding to the general formula: A 2−y B 1+y Me 3+ X 6 :xD wherein: A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions, B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions, A is different from B r A >r B , r A representing the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B Me 3+ =a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4.
Claim 2
Independent Claim
162 words
A method for recording X-rays comprising the steps of i. exposing a recording element comprising an X-ray intensifying screen in combination with a photosensitive material to X-rays, ii. recording the light emitted by said X-ray intensifying screen in said photosensitive material, wherein said X-ray intensifying screen comprises an elpasolite phosphor corresponding to the general formula: A 2−y B 1+y Me 3+ X 6 :xD wherein: A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions, B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions, A is different from B r A >r B , r A representing the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B Me 3+ =a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4.
Claim 3
Dependent Claim
15 words
A method according to claim 1 , wherein said phosphor has a specific gravity (sg)≧5.
Claim 4
Dependent Claim
53 words
A method according to claim 1 , wherein r A >r B >r Me 3+ , wherein r A represents the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B and r Me 3+ the ionic radius of the trivalent metal ion Me 3+ .
Claim 5
Dependent Claim
27 words
A method according to claim 1 , wherein Me 3+ is a member selected from the group consisting of Sc, La, Y, Gd, Tl, In and Bi.
Claim 6
Dependent Claim
17 words
A method according to claim 1 , wherein X is at least one of F, Br, I.
Claim 7
Dependent Claim
26 words
A method according to claim 1 , wherein D is a member selected from the group consisting of Sb, Cu, Ce, In, Tl, Na and Eu.
Claim 8
Dependent Claim
23 words
A method according to claim 1 , wherein D is a member selected from the group consisting of Ce, In, Tl and Eu.
Claim 9
Independent Claim
168 words
A method for recording X-rays comprising the steps of i. exposing a photostimulable storage phosphor screen, ii. storing the absorbed X-ray energy in said photostimulable phosphor screen, iii. stimulating said photostimulable phosphor screen with stimulating radiation to yield a stimulated light output, iv. reading said light output wherein said photostimulable phosphor screen comprises an elpasolite phosphor corresponding to the general formula: A 2−y B 1+y Me 3+ X 6 :xD wherein: A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions, B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions, A is different from B r A >r B , r A representing the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B Me 3+ =a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4.
Claim 10
Independent Claim
168 words
A method for recording X-rays comprising the steps of i. exposing a photostimulable storage phosphor screen, ii. storing the absorbed X-ray energy in said photostimulable phosphor screen, iii. stimulating said photostimulable phosphor screen with stimulating radiation to yield a stimulated light output, iv. reading said light output wherein said photostimulable phosphor screen comprises an elpasolite phosphor corresponding to the general formula: A 2−y B 1+y Me 3+ X 6 :xD wherein: A is a monovalent metal ion selected from the group consisting of Cs, Rb, K and Tl ions, B is a monovalent metal ion selected from the group consisting of Rb, K and Na ions, A is different from B r A >r B , r A representing the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B Me 3+ =a trivalent ion D is a dopant X is at least one of F, Cl, Br and I 0≦y≦1 0≦x≦0.2 and wherein said phosphor has a specific gravity (sg)≧4.
Claim 11
Dependent Claim
15 words
A method according to claim 8 , wherein said phosphor has a specific gravity (sg)≧5.
Claim 12
Dependent Claim
52 words
A method according to claim 8 , wherein r A >r B >r Me 3+, wherein R A represents the ionic radius of monovalent metal ion A, r B the ionic radius of monovalent metal ion B and r Me 3+ the ionic radius of the trivalent metal ion Me 3+ .
Claim 13
Dependent Claim
27 words
A method according to claim 8 , wherein Me 3+ is a member selected from the group consisting of Sc, La, Y, Gd, Tl, In and Bi.
Claim 14
Dependent Claim
17 words
A method according to claim 8 , wherein X is at least one of F, Br, I.
Claim 15
Dependent Claim
26 words
A method according to claim 8 , wherein D is a member selected from the group consisting of Sb, Cu, Ce, In, Tl, Na and Eu.
Claim 16
Dependent Claim
23 words
A method according to claim 8 , wherein D is a member selected from the group consisting of Ce, In, Tl and Eu.
Claim 17
Dependent Claim
22 words
A method according to claim 8 , wherein said elpasolite phosphor corresponds to the formula Cs 2 NaYF 6 :Ce 3+ .
References Cited (Backward Citations)
No citation records indexed.
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