EP0139192A2
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Radiographic intensifying screen
Assignee: Mitsubishi Chemical Corp
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Filing: 1984-09-04
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Granted: —
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Expires: 2004-09-04
Abstract
Abstract A radiographic intensifying screen comprising a support and a fluorescent layer formed on the support, characterized in that said fluorescent layer is composed essentially of a rare earth oxysulfide phosphor represented by the formula:where Ln is at least one element selected from the group consisting of La, Gd, Y and Lu, R is at least one element selected from the group consisting of Nd and Ho, A is at least one element selected from the group consisting of Pr, Er and Yb, and x, y and z are numbers within the ranges of 0.001≦x≦0.02, 0.0001≦y≦0.01 and O≦z≦0.01, respectively, and x?y+z.
Inventors
- 👤 Etsuo C/O Kasei Optonix Ltd Shimizu
- 👤 Yuji C/O Kasei Optonix Ltd Aoki
- 👤 Yujiro C/O Kasei Optonix Ltd Suzuki
- 👤 Norio C/O Kasei Optonix Ltd Miura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/16; G03C5/17; G21; G21K; G21K4/00; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7771; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/27; Y10T428/273
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A radiographic intensifying screen comprising a support and a fluorescent layer formed on the support, characterized in that said fluorescent layer is composed essentially of a rare earth oxysulfide phosphor represented by the formula: where Ln is at least one element selected from the group consisting of La, Gd, Y and Lu, R is at least one element selected from the group consisting of Nd and Ho, A is at least one element selected from the group consisting of Pr, Er and Yb, and x, y and z are numbers within the ranges of 0.001≦x≦0.02, 0.0001≦y≦0.01 and 0≦z≦0.01, respectively, and xzy+z.
Claim 2
Dependent Claim
101 words
A radiographic intensifying screen comprising a support and a fluorescent layer formed on the support, characterized in that said fluorescent layer is composed essentially of a rare earth oxysulfide phosphor represented by the formula: where Ln is at least one element selected from the group consisting of La, Gd, Y and Lu, R is at least one element selected from the group consisting of Nd and Ho, A is at least one element selected from the group consisting of Pr, Er and Yb, and x, y and z are numbers within the ranges of 0.001≦x≦0.02, 0.0001≦y≦0.01 and 0≦z≦0.01, respectively, and xzy+z.
Claim 3
Dependent Claim
20 words
The radiographic intensifying screen according to Claim 1, wherein y is a number within the range of 0.0002≦y≦y≦0.01 and z=0.
Claim 4
Dependent Claim
18 words
The radiographic intensifying screen according to Claim 1, wherein z is a number within the range of 0.0001≦z≦0.01.
Claim 5
Dependent Claim
40 words
The radiographic intensifying screen according to Claim 1, wherein the phosphor in the fluorescent layer has a mean grain size of from 2 to 15 µm and a standard deviation (quartile deviation) of the grain size of at most 0.40.
Claim 6
Dependent Claim
26 words
The radiographic intensifying screen according to Claim 1, wherein the coating weight of the phosphor in the fluorescent layer is from 10 to 100 mg/cm .
Claim 7
Dependent Claim
22 words
The radiographic intensifying screen according to Claim 1, wherein a light absorptive layer is interposed between the support and the fluorescent layer.
References Cited (Backward Citations)
No citation records indexed.
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