US4041319A
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Radiographic phosphor screen
Assignee: Hitachi Ltd
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Filing: 1976-03-26
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Granted: 1977-08-09
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Expires: 1996-03-26
Abstract
Abstract A radiographic phosphor screen to be used as an intensifying screen, a direct viewing fluorescent screen, an input screen of an image intensifier tube for radiography and the like, which comprises a substrate and, supported thereon, a phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)0.sub.4 wherein M stands for at least one element selected from the group consisting of yttrium (Y), lanthanum (La), gadolium (Gd) and lutetium (Lu) and x is a number of from 0.7 to 0.99, Or a phosphate formed by activating said phosphor with 0.01 to 0.5 mole % of thulium (Tm).
Inventors
- 👤 Tadashi Fukuzawa
- 👤 Teruki Suzuki
- 👤 Shigeru Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:29
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7708; C09K11/7709; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
50 words
A radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99.
Claim 2
Dependent Claim
50 words
A radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99.
Claim 3
Dependent Claim
31 words
A radiographic phosphor screen as set forth in claim 1 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 4
Dependent Claim
18 words
A radiographic phosphor screen as set forth in claim 1 wherein M in the general formula is Lu.
Claim 5
Dependent Claim
24 words
A radiographic phosphor screen as set forth in claim 1 wherein x in the general formula is a number of from 0.75 to 0.95.
Claim 6
Dependent Claim
46 words
A radiographic phosphor screen as set forth in claim 1 wherein the substrate is at least one member selected from the group consisting of plastic films, plastic film-coated papers, glass plates, aluminum plates, beryllium plates, and a combination of two or more of the foregoing materials.
Claim 7
Dependent Claim
66 words
A radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, said phospho-vanadate phosphor being activated with 0.01 to 0.5 mole % of thulium as an activator.
Claim 8
Dependent Claim
66 words
A radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, said phospho-vanadate phosphor being activated with 0.01 to 0.5 mole % of thulium as an activator.
Claim 9
Dependent Claim
31 words
A radiographic phosphor screen as set forth in claim 6 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 10
Dependent Claim
14 words
A radiographic phosphor screen as set forth in claim 6 wherein M is Lu.
Claim 11
Dependent Claim
24 words
A radiographic phosphor screen as set forth in claim 6 wherein x in the general formula is a number of from 0.75 to 0.95.
Claim 12
Dependent Claim
46 words
A radiographic phosphor screen as set forth in claim 6 wherein the substrate is at least one member selected from the group consisting of plastic films, plastic film-coated papers, glass sheets, aluminum plates, beryllium plates and a combination of two or more of the foregoing materials.
Claim 13
Dependent Claim
58 words
An X-ray image converter comprising a substrate, a phospho-vanadate phosphor supported on said substrate, said phosphovanadate being represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)0.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, and an X-ray source.
Claim 14
Dependent Claim
58 words
An X-ray image converter comprising a substrate, a phospho-vanadate phosphor supported on said substrate, said phosphovanadate being represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)0.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, and an X-ray source.
Claim 15
Dependent Claim
31 words
An X-ray image converter as set forth in claim 11 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 16
Dependent Claim
24 words
An X-ray image converter as set forth in claim 11 wherein x in the general formula is a number of from 0.75 to 0.95.
Claim 17
Dependent Claim
73 words
An X-ray image converter comprising a substrate, a phospho-vanadate phosphor supported on said support, said phosphovanadate phosphor being represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, and being activated by 0.01 to 0.5 mole % of thulium as an activator, and an X-ray source.
Claim 18
Dependent Claim
73 words
An X-ray image converter comprising a substrate, a phospho-vanadate phosphor supported on said support, said phosphovanadate phosphor being represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, and being activated by 0.01 to 0.5 mole % of thulium as an activator, and an X-ray source.
Claim 19
Dependent Claim
31 words
An X-ray image converter as set forth in claim 14 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 20
Dependent Claim
24 words
An X-ray image converter as set forth in claim 14 wherein x in the general formula is a number of from 0.75 to 0.95.
Claim 21
Independent Claim
73 words
A method for converting radioactive rays to visible rays comprising applying radioactive rays to a radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one member selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, to thereby convert the radioactive rays to visible rays.
Claim 22
Independent Claim
73 words
A method for converting radioactive rays to visible rays comprising applying radioactive rays to a radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one member selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, to thereby convert the radioactive rays to visible rays.
Claim 23
Dependent Claim
27 words
A method according to claim 17 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 24
Dependent Claim
22 words
A method according to claim 17 wherein the radioactive rays applied are radioactive rays having an energy of 0.01 to 10 MeV.
Claim 25
Independent Claim
89 words
A method for converting radioactive rays to visible rays comprising applying radioactive rays to a radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, said phospho-vanadate phosphor being activated with 0.01 to 0.5 mole % of thulium as an activator, to thereby convert the radioactive rays to visible rays.
Claim 26
Independent Claim
89 words
A method for converting radioactive rays to visible rays comprising applying radioactive rays to a radiographic phosphor screen comprising a substrate and, supported thereon, a phospho-vanadate phosphor represented by the following general formula: M(P.sub.x, V.sub.1.sub.-x)O.sub.4 wherein M stands for at least one element selected from the group consisting of Y, La, Lu and Gd, and x is a number of from 0.7 to 0.99, said phospho-vanadate phosphor being activated with 0.01 to 0.5 mole % of thulium as an activator, to thereby convert the radioactive rays to visible rays.
Claim 27
Dependent Claim
27 words
A method according to claim 20 wherein M in the general formula is at least one element selected from the group consisting of Y, Lu and Gd.
Claim 28
Dependent Claim
22 words
A method according to claim 22 wherein the radioactive rays applied are radioactive rays having an energy of 0.01 to 10 MeV.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-08 | 1981-02-07 | 1981-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-08 | 1985-02-07 | 1985-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-08 | 1989-02-07 | 1989-08-09 | $7700.00 | Window Closed / Lapsed |