GB862434A - Measurement of gamma ray energy due to inelastic neutron scattering - Google Patents
Measurement of gamma ray energy due to inelastic neutron scatteringInfo
- Publication number
- GB862434A GB862434A GB600559A GB600559A GB862434A GB 862434 A GB862434 A GB 862434A GB 600559 A GB600559 A GB 600559A GB 600559 A GB600559 A GB 600559A GB 862434 A GB862434 A GB 862434A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gamma radiation
- neutrons
- energy
- output
- earth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005251 gamma ray Effects 0.000 title abstract 3
- 238000001427 incoherent neutron scattering Methods 0.000 title 1
- 238000005259 measurement Methods 0.000 title 1
- 230000005855 radiation Effects 0.000 abstract 8
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 abstract 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 2
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 abstract 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 2
- 239000005864 Sulphur Substances 0.000 abstract 2
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 abstract 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 229910052799 carbon Inorganic materials 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 2
- 229910052805 deuterium Inorganic materials 0.000 abstract 2
- 239000007789 gas Substances 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- 229910052722 tritium Inorganic materials 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract 1
- 229910052790 beryllium Inorganic materials 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 229910052729 chemical element Inorganic materials 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 239000010949 copper Substances 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000005755 formation reaction Methods 0.000 abstract 1
- 230000001678 irradiating effect Effects 0.000 abstract 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract 1
- 229910052753 mercury Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 abstract 1
- 235000009518 sodium iodide Nutrition 0.000 abstract 1
- 239000002344 surface layer Substances 0.000 abstract 1
- 229910052716 thallium Inorganic materials 0.000 abstract 1
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 abstract 1
- 229910052726 zirconium Inorganic materials 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
- G01V5/04—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging
- G01V5/08—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays
- G01V5/10—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources
- G01V5/101—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity specially adapted for well-logging using primary nuclear radiation sources or X-rays using neutron sources and detecting the secondary Y-rays produced in the surrounding layers of the bore hole
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Radiation (AREA)
Abstract
862,434. Neutron well logging. SOCONY MOBIL OIL CO. Inc. Feb. 20, 1959, No. 6005/59. Class 40(3) It has been found that certain chemical elements occurring in earth formations, e.g. oxygen, carbon and sulphur, emit gamma radiation of a characteristic energy level when bombarded with neutrons of energy at least equal to said characteristic level, the characteristic energy levels being fairly distinctive for such elements, e.g. 6 and 7 M.e.v. for oxygen, 4.5 M.e.v. for carbon and 2.3 M.e.v. for sulphur, Fig. 3 (not shown). According to the present invention the concentration of such an element in the earth surrounding a bore hole is recorded as a function of position along the hole by traversing the hole with an exploring unit 10 containing a source of light energy neutrons and means for detecting gamma radiation emitted by the surrounding earth in response to irradiation by the neutrons, means being also provided for recording the intensity of the component of the detected gamma radiation having energies within a restricted energy band which includes the characteristic energy level of the element being tested for. As shown the neutron source 14 comprises a cylindrical target electrode 15 having an inner surface layer of zirconium upon which tritium gas (H<SP>3</SP>) has been adsorbed and an axial electrode 16 maintained at a positive potential greater than 5,000 v, the space between the electrodes being filled with deuterium gas (H<SP>2</SP>) at a-pressure of 10<SP>-3</SP> to 10<SP>-5</SP> mm of mercury. The resultant bombardment of the tritium by the deuterium results in 14 M.e.v. monoenergetic neutrons without the direct production of gamma radiation. The voltage for the axial electrode 16 may be produced by a Van de Graaf generator, Fig. 4 (not shown). The gamma radiation produced by irradiating the surrounding earth with the neutrons is detected by a scintillation crystal 25 (thallium actuated sodium iodide) and photomultiplier tube 26 whose electrical pulse output is applied to a differential pulse light analyser 27 which is adjusted to produce an output proportional to the intensity of the gamma radiation within the appropriate energy band. The output from the analyser 27 is transmitted uphole by a cable 11 and applied to a recorder 32 whose recording medium is moved in correspondence with the exploring unit 10 by means of a mechanical linkage 33, 34. A multi-channel recorder may be employed for the simultaneous detection of a plurality of elements having different characteristic energy levels. The crystal 25 is shielded from the neutron source 14 by a copper slug 24. In a modification, Fig. 5 (not shown), the neutron source comprises a radium-beryllium or polonium-berylium mixture. Such a source also produces direct gamma radiation and the gamma ray detector is shielded from such radiation by a lead shield. In this embodiment the differential pulse light analyser is located at the surface and the output from the gamma ray detector is transmitted thereto by modulation of a carrier oscillation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB600559A GB862434A (en) | 1959-02-20 | 1959-02-20 | Measurement of gamma ray energy due to inelastic neutron scattering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB600559A GB862434A (en) | 1959-02-20 | 1959-02-20 | Measurement of gamma ray energy due to inelastic neutron scattering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB862434A true GB862434A (en) | 1961-03-08 |
Family
ID=9806686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB600559A Expired GB862434A (en) | 1959-02-20 | 1959-02-20 | Measurement of gamma ray energy due to inelastic neutron scattering |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB862434A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864883A2 (en) * | 1997-03-04 | 1998-09-16 | Schlumberger Limited | Method for determining density of earth formations |
| US7361886B2 (en) | 2005-02-28 | 2008-04-22 | Schlumberger Technology Corporation | Corrections of gamma-ray responses |
| US7365307B2 (en) | 2005-02-28 | 2008-04-29 | Schlumberger Technology Corporation | Sigma/porosity tools with neutron monitors |
| US7642507B2 (en) | 2005-02-28 | 2010-01-05 | Schlumberger Technology Corporation | Apparatus and methods for interlaced density and neutron measurements |
-
1959
- 1959-02-20 GB GB600559A patent/GB862434A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0864883A2 (en) * | 1997-03-04 | 1998-09-16 | Schlumberger Limited | Method for determining density of earth formations |
| EP0864883A3 (en) * | 1997-03-04 | 2004-07-28 | Schlumberger Limited | Method for determining density of earth formations |
| US7361886B2 (en) | 2005-02-28 | 2008-04-22 | Schlumberger Technology Corporation | Corrections of gamma-ray responses |
| US7365307B2 (en) | 2005-02-28 | 2008-04-29 | Schlumberger Technology Corporation | Sigma/porosity tools with neutron monitors |
| US7642507B2 (en) | 2005-02-28 | 2010-01-05 | Schlumberger Technology Corporation | Apparatus and methods for interlaced density and neutron measurements |
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