US5025151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lutetium orthosilicate single crystal scintillator detector
Assignee: Schlumberger Technology Corp
•
Filing: 1990-08-30
•
Granted: 1991-06-18
•
Expires: 2010-08-30
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
2026-11-08 12:37
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: 10
Claim 1
Independent Claim
57 words
Apparatus for investigation of subsurface earth formations comprising: a sonde adapted for movement through a borehole; detector means carried by said sonde for detecting radiation and including a lutetium oxyorthosilicate scintillator; and means coupled to said detector means for generating and recording a signal representative of at least one characteristic of radiation detected by said detector means.
Claim 2
Dependent Claim
57 words
Apparatus for investigation of subsurface earth formations comprising: a sonde adapted for movement through a borehole; detector means carried by said sonde for detecting radiation and including a lutetium oxyorthosilicate scintillator; and means coupled to said detector means for generating and recording a signal representative of at least one characteristic of radiation detected by said detector means.
Claim 3
Dependent Claim
52 words
The apparatus of claim 1 above wherein said scintillator is composed of a single transparent 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 x 10 -4 to approximately 3 x 10 -2 .
Claim 4
Dependent Claim
83 words
The apparatus of claim 1 above wherein said scintillator is composed of a single transparent crystal of cerium-activated lutetium oxyorthosilicate having the general formulation Ce 2x Lu 2 (1-x) SiO 5 , wherein x is within the range of from approximately 2 x 10 -4 to approximately 3 x 10 -2 , and wherein said detector means further comprises 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 5
Independent Claim
27 words
The apparatus of claims 2 or 3 or wherein x is within the range of approximately 1 x 10 -3 to approximately 4.5 x 10 3 .
Claim 6
Dependent Claim
91 words
Apparatus for investigation of subsurface earth formations comprising: a sonde adapted for movement through a borehole; source means carried by said sonde for irradiating material in the region of said borehole with penetrating radiation capable of interaction with said material resulting in radiation having characteristics carrying information about said material; detector means carried by said sonde for detecting radiation and including a lutetium oxyorthosilicate scintillator; and means coupled to said detector means for generating and recording a signal representative of at least one characteristic of radiation detected by said detector means.
Claim 7
Dependent Claim
91 words
Apparatus for investigation of subsurface earth formations comprising: a sonde adapted for movement through a borehole; source means carried by said sonde for irradiating material in the region of said borehole with penetrating radiation capable of interaction with said material resulting in radiation having characteristics carrying information about said material; detector means carried by said sonde for detecting radiation and including a lutetium oxyorthosilicate scintillator; and means coupled to said detector means for generating and recording a signal representative of at least one characteristic of radiation detected by said detector means.
Claim 8
Dependent Claim
52 words
The apparatus of claim 5 above wherein said scintillator is composed of a single transparent crystal of cerium-activated lutetium oxyorthosilicate having a general formulation Ce 2x Lu 2 (1-x) SiO 5 , where x is within the range of from approximately 2 x 10 -4 to approximately 3 x 10 -2 .
Claim 9
Dependent Claim
83 words
The apparatus of claim 5 above wherein said scintillator is composed of a single transparent 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 x 10 -4 to approximately 3 x 10 -2 , and wherein said detector means further comprises 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 10
Independent Claim
27 words
The apparatus of claims 5 or 6 above wherein x is within the range of approximately 1 x 10 -3 to approximately 4.5 x 10 -3 .
References Cited (Backward Citations)
US3546512A
Cited
US3521064A
Cited
US3461291A
Cited
JPS5159079A
Cited
US4012712A
Cited
US4317993A
Cited
DE3303166A1
Cited
US4647781A
Cited
US4883956A
Cited
EP0321805A1
Cited
US4958080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |