US4119847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibrator for radioactivity well logging tools
Assignee: Schlumberger Technology Corp
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Filing: 1976-10-28
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Granted: 1978-10-10
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Expires: 1996-10-28
Abstract
Abstract A radioactivity well logging tool including a gamma radiation detector is field calibrated with the help of a flexible sheet having a radioactive substance dispersed therein, which is wrapped about the tool so as to completely surround the detector. The sheet is made of an elastomer such as polyurethane, and the radioactive substance is carnotite. This sheet is placed within a nylon sheath which has straps for holding the calibrator wrapped around the tool.
Inventors
- 👤 James A. Waggoner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:25
CPC Classifications
G; G01; G01V; G01V13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A portable calibrator for radioactivity logging tools having a substantially cylindrical housing adapted to be moved in a borehole and a gamma radiation detector carried by said housing, said calibrator comprising: a flexible sheet that can be wrapped around the portion of said housing carrying the radiation detector and is of sufficient size so as to completely encircle said housing portion and to extend for about one housing diameter above and one housing diameter below said detector; and a radioactive substance dispersed within said sheet.
Claim 2
Dependent Claim
85 words
A portable calibrator for radioactivity logging tools having a substantially cylindrical housing adapted to be moved in a borehole and a gamma radiation detector carried by said housing, said calibrator comprising: a flexible sheet that can be wrapped around the portion of said housing carrying the radiation detector and is of sufficient size so as to completely encircle said housing portion and to extend for about one housing diameter above and one housing diameter below said detector; and a radioactive substance dispersed within said sheet.
Claim 3
Dependent Claim
16 words
The calibrator of claim 1, further comprising means for holding said sheet wrapped around the housing.
Claim 4
Dependent Claim
14 words
The calibrator of claim 1, wherein said sheet is made of a resilient material.
Claim 5
Dependent Claim
12 words
The calibrator of claim 3, wherein said sheet is made of polyurethane.
Claim 6
Dependent Claim
11 words
The calibrator of claim 1, wherein said radioactive substance is carnotite.
Claim 7
Dependent Claim
14 words
The calibrator of claim 1, wherein said sheet is covered with a flexible sheath.
Claim 8
Dependent Claim
12 words
The calibrator of claim 6, wherein said sheath is made of nylon.
Claim 9
Dependent Claim
105 words
A portable calibrator for radioactivity logging tools having a substantially cylindrical housing adapted to be moved in a borehole and a gamma radiation detector carried by said housing, said calibrator comprising: a sheet of resilient material that can be wrapped around the portion of said housing carrying the radiation detector and is of sufficient size so as to completely encircle said housing portion and to extend for about one housing diameter above and one housing diameter below said detector; a radioactive substance dispersed within said sheet; a flexible sheath covering said sheet; and means attached to said sheath for holding it wrapped around the housing.
Claim 10
Dependent Claim
105 words
A portable calibrator for radioactivity logging tools having a substantially cylindrical housing adapted to be moved in a borehole and a gamma radiation detector carried by said housing, said calibrator comprising: a sheet of resilient material that can be wrapped around the portion of said housing carrying the radiation detector and is of sufficient size so as to completely encircle said housing portion and to extend for about one housing diameter above and one housing diameter below said detector; a radioactive substance dispersed within said sheet; a flexible sheath covering said sheet; and means attached to said sheath for holding it wrapped around the housing.
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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |