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US4958080A
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Lutetium orthosilicate single crystal scintillator detector
Assignee: Schlumberger Technology Corp
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Filing: 1989-08-04
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Granted: 1990-09-18
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Expires: 2009-08-04
Abstract
Abstract A scintillator for use as a gamma ray or like radiation detector is composed of a single crystal of cerium-activated lutetium oxyorthosilicate having the general formulation Ce 2x Lu 2 (1-x) SiO 5 . In a borehole logging application, the detector is mounted in a logging sonde with a high energy neutron source, for movement through a borehole traversing earth formations. Gamma radiation from the surrounding formations is detected and analyzed to provide information concerning hydrocarbons in the formations.
Inventors
- 👤 Charles L. Melcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:34
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/16; G01T1/20; G01T1/202; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A gamma ray or x-ray detector, comprising: a scintillator composed of a transparent single crystal of cerium-activated lutetium oxyorthosilicate having the general formulation Ce 2x Lu 2 (1-x) SiO 5 , where x is within the range of from approximately 2×10 -4 to approximately 3×10 -2 , and a photodetector optically coupled to the scintillator for producing an electrical signal in response to the emission of a light pulse by the scintillator.
Claim 2
Dependent Claim
72 words
A gamma ray or x-ray detector, comprising: a scintillator composed of a transparent single crystal of cerium-activated lutetium oxyorthosilicate having the general formulation Ce 2x Lu 2 (1-x) SiO 5 , where x is within the range of from approximately 2×10 -4 to approximately 3×10 -2 , and a photodetector optically coupled to the scintillator for producing an electrical signal in response to the emission of a light pulse by the scintillator.
Claim 3
Dependent Claim
20 words
The detector of claim 1 wherein x is within the range of approximately 1×10 -3 to approximately 4.5×10 -3 .
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) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |