US4256965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High energy fluoroscopic screen
Assignee: United States Department of the Navy
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Filing: 1979-01-15
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Granted: 1981-03-17
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Expires: 1999-01-15
Abstract
Abstract A high energy fluoroscopic screen for converting photons into light. A hiZ foil converts a portion of the photon flux field from a specimen irradiated by photons into secondary radiations which cause a phosphor layer to luminesce. A polycellular image converter (PIC) gathers the light emitted by the phosphor as well as converting additional photons to light. The light is sensed by a low light level TV chain.
Inventors
- 👤 A. D. Lucian, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:12
CPC Classifications
G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
121 words
A high energy, filmless radiographic system for inspecting large objects comprising: (a) means for generating a high energy photon beam; (b) means for converting the varying photon flux from a specimen irradiated by said high energy photon beam to light, said converting means being a high energy fluoroscopic screen having a high-Z foil to convert a portion of said high energy photon beam to secondary radiation, a phosphor coated on said high-Z foil to convert said secondary radiation to light, and a polycellular image converter (PIC) attached to said phosphor to gather said light and to convert an additional portion of said high energy photon beam to light; and (c) means for sensing and displaying the light from said converting means.
Claim 2
Dependent Claim
121 words
A high energy, filmless radiographic system for inspecting large objects comprising: (a) means for generating a high energy photon beam; (b) means for converting the varying photon flux from a specimen irradiated by said high energy photon beam to light, said converting means being a high energy fluoroscopic screen having a high-Z foil to convert a portion of said high energy photon beam to secondary radiation, a phosphor coated on said high-Z foil to convert said secondary radiation to light, and a polycellular image converter (PIC) attached to said phosphor to gather said light and to convert an additional portion of said high energy photon beam to light; and (c) means for sensing and displaying the light from said converting means.
Claim 3
Dependent Claim
39 words
A high energy, filmless radiographic system as recited in claim 1 further comprising means for providing continuous motion of said specimen with respect to said high energy photon beam to permit 100 percent inspection of said specimen for cracks.
Claim 4
Dependent Claim
30 words
A high energy, filmless radiographic system as recited in claim 2 wherein said high-Z foil comprises a material selected from the group consisting of tungsten, tantalum, uranium, platinum and rhenium.
Claim 5
Dependent Claim
33 words
A high energy, filmless radiographic system as recited in claim 2 wherein said phosphor comprises a material selected from the group consisting of oxysulfides of lanthanum, gadolinium or lutetium activated with trivalent terbium.
Claim 6
Dependent Claim
29 words
A high energy fluoroscopic screen comprising: (a) a high-Z foil; (b) a phosphor coated on said high-Z foil; and (c) a polycellular image converter (PIC) attached to said phosphor.
Claim 7
Dependent Claim
29 words
A high energy fluoroscopic screen comprising: (a) a high-Z foil; (b) a phosphor coated on said high-Z foil; and (c) a polycellular image converter (PIC) attached to said phosphor.
Claim 8
Dependent Claim
29 words
A high energy fluoroscopic screen as recited in claim 5 wherein said high Z-foil comprises a material selected from the group consisting of tungsten, tantalum, uranium, platinum and rhenium.
Claim 9
Dependent Claim
32 words
A high energy fluoroscopic screen as recited in claim 5 wherein said phosphor comprises a material selected from the group consisting of oxysulfides of lanthanum, gadolinium or lutetium activated with trivalent terbium.
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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |