US4136282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional detector of gamma rays
Assignee: United States Department of Energy
•
Filing: 1977-11-29
•
Granted: 1979-01-23
•
Expires: 1997-11-29
Abstract
Abstract A directional detector of gamma rays comprises a strip of an electrical cuctor of high atomic number backed with a strip of a second electrical conductor of low atomic number. These elements are enclosed within an electrical conductor that establishes an electrical ground, maintains a vacuum enclosure and screens out low-energy gamma rays. The detector exhibits a directional sensitivity marked by an increased output in the favored direction by a factor of ten over the output in the unfavored direction.
Inventors
- 👤 Samson A. Cox
- 👤 Francis E. LeVert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:50
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A directional detector of gamma rays comprising a first strip of an electrical conductor of high atomic number, a second strip of an electrical conductor of a low atomic number disposed parallel to the first strip and bonded thereto in physical and electrical contact therewith, an electrode coaxial with the first and second strips, means for maintaining a vacuum inside the detector, means for completing an electrical circuit between the conducting strips and the electrode, and means for measuring the electric current in the circuit.
Claim 2
Dependent Claim
85 words
A directional detector of gamma rays comprising a first strip of an electrical conductor of high atomic number, a second strip of an electrical conductor of a low atomic number disposed parallel to the first strip and bonded thereto in physical and electrical contact therewith, an electrode coaxial with the first and second strips, means for maintaining a vacuum inside the detector, means for completing an electrical circuit between the conducting strips and the electrode, and means for measuring the electric current in the circuit.
Claim 3
Dependent Claim
17 words
The apparatus of claim 1 wherein the first strip is lead and the second strip is graphite.
Claim 4
Dependent Claim
15 words
The apparatus of claim 1 wherein the vacuum is at least 1 micron of mercury.
References Cited (Backward Citations)
US3699340A
Cited
US4091288A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |