Patent US3858050A successfully refreshed from Google Patents.
US3858050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically insulating gamma radiation shield
Assignee: Solon Technologies Inc
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Filing: 1972-09-29
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Granted: 1974-12-31
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Expires: 1992-09-29
Abstract
Abstract In a gamma-ray camera which utilizes a main image intensifier or amplifier tube coupled to a second image amplifier tube, leakage of noise from extraneous sources occurs axially through the zone between the main image tube and a back shield which surrounds the main image tube. Axial leakage is essentially eliminated by an insulating axial shield which jackets the main image tube, the second image tube, and the coupling rings which couple the main image tube to the second image tube. In a specific embodiment, the axial shield is formed by a filled electrically nonconductive resin. Electrically non-conductive heavy metal oxides, such as lead oxide, are preferred fillers.
Inventors
- 👤 R Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1645; G21; G21F; G21F5/00; G21F5/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
100 words
In a gamma-ray camera having an image amplification means operating at an electrical potential in the range from about 10,000 to about 100,000 volts, the improvement consisting of a self-supporting insulating axial shield, of sufficient thickness to shield against gamma-rays of predetermined energy, disposed around the circumferentially closely embracing said amplification means in electrically non-conductive spaced-apart relationship therewith, said axial shield comprising a non-radioactive, heavy metal having an atomic number greater than 73, or a compound thereof, disposed within an electrically non-conductive resin so as to prevent arcing between said heavy metal or compound thereof and said image amplification means.
Claim 2
Dependent Claim
100 words
In a gamma-ray camera having an image amplification means operating at an electrical potential in the range from about 10,000 to about 100,000 volts, the improvement consisting of a self-supporting insulating axial shield, of sufficient thickness to shield against gamma-rays of predetermined energy, disposed around the circumferentially closely embracing said amplification means in electrically non-conductive spaced-apart relationship therewith, said axial shield comprising a non-radioactive, heavy metal having an atomic number greater than 73, or a compound thereof, disposed within an electrically non-conductive resin so as to prevent arcing between said heavy metal or compound thereof and said image amplification means.
Claim 3
Dependent Claim
43 words
The article of claim 1 wherein said electrically non-conductive resin circumferentially envelops said image amplification means and is curable in contact therewith at a temperature below that which is injurious to said image amplification means, and said heavy metal oxide is lead oxIde.
Claim 4
Dependent Claim
43 words
The article of claim 2 wherein said electrically non-conductive resin circumferentially envelops said image amplification means and is curable in contact therewith at a temperature below that which is injurious to said image amplification means, and said heavy metal oxide is lead oxide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |