CA1221476A - Probe for insertion into drill holes for the purpose of locating mineral deposits - Google Patents
Probe for insertion into drill holes for the purpose of locating mineral depositsInfo
- Publication number
- CA1221476A CA1221476A CA000451657A CA451657A CA1221476A CA 1221476 A CA1221476 A CA 1221476A CA 000451657 A CA000451657 A CA 000451657A CA 451657 A CA451657 A CA 451657A CA 1221476 A CA1221476 A CA 1221476A
- Authority
- CA
- Canada
- Prior art keywords
- probe
- irradiation
- aperture
- drill hole
- distinguished
- 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
- 239000000523 sample Substances 0.000 title claims abstract description 23
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 6
- 239000011707 mineral Substances 0.000 title claims abstract description 6
- 230000037431 insertion Effects 0.000 title claims abstract 3
- 238000003780 insertion Methods 0.000 title claims abstract 3
- 230000005855 radiation Effects 0.000 claims abstract description 16
- 230000002285 radioactive effect Effects 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 2
- 229910052790 beryllium Inorganic materials 0.000 claims 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims 1
- 238000000354 decomposition reaction Methods 0.000 abstract description 2
- 206010056740 Genital discharge Diseases 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 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
- G01V5/14—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 a combination of several sources, e.g. a neutron and a gamma source
-
- 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
-
- 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
- G01V5/12—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 gamma or X-ray sources
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)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Photoreceptors In Electrophotography (AREA)
- Compounds Of Unknown Constitution (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Drilling And Boring (AREA)
Abstract
- ABSTRACT -The invention concerns a probe for insertion into drill holes for the purpose of locating mineral ore deposits. A radioactive source of irradiation and a detector, which is opposite the irradiation source and is shielded by an aperture for determining the fluorescent radiation which is stimulated through the radioactive irradiation in the drill hole wall, are concentrically located within a cylindrical housing.
The aperture forms a slot running vertically to the axis of the probe, which extends to the internal wall of the housing. The disk-shaped aperture causes, not only a limiting of the irradiation on the ring-shaped wall portion of the drill hole, and thereby a great decomposition in the drill hole alignment, but also, moreover, an increase of intensity through the reflec-tions of the radioactive irradiation on the disk-shaped surfaces of the aperture.
The aperture forms a slot running vertically to the axis of the probe, which extends to the internal wall of the housing. The disk-shaped aperture causes, not only a limiting of the irradiation on the ring-shaped wall portion of the drill hole, and thereby a great decomposition in the drill hole alignment, but also, moreover, an increase of intensity through the reflec-tions of the radioactive irradiation on the disk-shaped surfaces of the aperture.
Description
" 3L~Z~9~76 The invention concerns a probe of the type stated in the higher concept o:E Pa-tent Claim 1.
Probes of the type under discussion are known.
They serve in locating mineral deposits by using fluores-cences, which are stimulated by means of the radioactive source o:E irradiation located in the probe. The -type and the character of a deposit can be determined by evaluating the fluorescent radiation. It can particularly be determined whether heavy metal or ferrous metal ores are present in the deposit.
For the determination of the fluorescent radiation, it was known to posi-tion a semi-conductor crystal in the probe, which, however, re~uires an extensive cooling assembly. The reflection of the radioac-tive irradiation occurred in the known probes over a large area. Also, the reception of the fluorescent radiation occurred over an extensive area~ so that a fine analysis o the composition of the deposits was not possible.
The execution of core borings of sligh~ diameter for the fine investigation of the vertical composition was known from this. These are, however, time-consuming and costly. Moreover, core damage can occur, so that the advantages are essentially lost. `
Through FR-PS l 387 139, a probe of the type under discussion is known, in which anaperture protects the radiation detector against the arrival of radiation -- 1 -- ~'i'~"
directly from the source o.E radioactive irradiation.
However, the irradiation angles of the radioactive irradiation source, as well. as their anyle o:E incidence on-to the detector, are so grea-t -that -the vertical de-composition is very slight, so that the findings abou-t these deposits are also very limited.
The basis of the inven-tion is the task of creating a probe of the type under discussion, by means of which the composition of deposits, especially ore mineral deposits, can be precisely scanned and analyzed, simply, cheaply, and quickly, and out of small-_aliber test drill holes, and with a small penetration area of the irradiation for transmission and reception.
The task which is the basis of the invention is solved through the pattern cited in the distinguishing mark of Patent Claim 1.
On the basis of the development of the aperture as specified by the invention, there o~curs a practically disk-shaped-irradiation of the drill hole wall, so that, in this way, only a narrow ring is irradiated, and thus stimulated to fluorescence. Fluorescent radiation is thereby collected only from this narrow ring surface by the receptor surface of the detecor, so that radiation from other areas does not impair the test results. There also occurs on the whole a greater decomposi-tion, which makes possible better findings about the mineral deposits.
In an advantageous manner, an increase of energy, throuyh reflections on the aperture walls, furthermore appears through the closely neighboring aperture surfaces.
Through the further development of the invention in accordance with Claim 2, the path of the rays ls improved for -the fluorescen-t radiation, so tha-t, in an advantageous manner, the detector can advance closer axially, so that the intensity of the radiation collected is increased, and, furthermore, the arrival of radiation from directions other than the one wanted is curbed. In this connection, the further development in accordance with Claim 3, by which the reception surface of the detector stands essentially vertical to the axis of the probe, is especially suitable~ It can also be slightly inclined, or, for example, even conically shaped.
On the basis of the disk-shaped radioactive irradiation, the opening area o~ the irradiation, through the wall of the housing, is likewise narrow, so that the material area of -the wall, which makes possible the pass-ing through of the radiation through the wall, can be measured corxespondingly small. The same applies to the area of the irradiation falling from the fluorescence source onto the reception surface of the detector.
The conical surface in which the external surface of the aperture lies, and the extension over the points of the cone, suitably intersect the reception surface, and therefore do not run past i-t externally, so that no ~Z~ 6 portion of the fluorescing radiation also impinges on -the borehole wa.ll wh.ich lies opposite, which can, undesirably, st.imulate further developmen-t.
In the diagram, the invention is more closely illustrated in an example of execution.
The diagram shows an example of execu-tion of a probe in accordance with the invention, par-tially cu-t away axially and partially cu-t axially, so that, in the cut area, a wall of a drill hole is indicated. The probe has a housing, in the internal space of which, coaxially to the housing, a radioactive source of irradiation is located, the irradiation of which passes through a slot to the outside, which slot is formed between two aperture parts. The radiation limited to the slot enters in-to the drill hole through a wall portion of the housing, and irradiates a wall area of the wall of the drill hole which lies between two points, and exhibits the form of a ring.
This area of the drill hole wall is stimulated for fluores-cence, according to the ores found in this area, and this fluorescent irradiation proceeds through a wall part lying between two projections aligned inwardly to the reception surface of a detector, which an be a scintil-lation detector or a semi-conductor detec-tor. The fluores-cence signal is transformed into an intelligence signal electrically depended on it.
The aperture part has an external surface directed to the reception surface of the detector, which surface is conical, and the extension of which, on the ouks:icie, meets approximately at point 11, that is, the approxirnate boundary of -the irradiated ri.ng of the wall of the dril:L
hole, which is axially deflected to the recep-tion surEace.
Because of the conical form, the fluorescent irradiation from the area of the ring can reach, substantially un- ¦
impaired, the entire reception surface of the detector.
The course of the radiation of the source of irradiation and of the fluorescent irradiation of the ring is indicated by the thin dotted line.
The housing is closed at the bottom by means of a housing part, only indicated, that is screwed into -the internal screw thread. In the same way, the housing is closed at the top by means of a housing part, which is screwed onto an external screw thread.
A coaxial cable extends out of the probe to a feeding device, by means o which the probe can be moved into the drill hole in a way that can be precisely determined. The current supply and transmission of the intelllgence signal from the detector to a plotting circuit (now shown), which is located outside of the drill hole, takes place by means of the coaxial cable.
Probes of the type under discussion are known.
They serve in locating mineral deposits by using fluores-cences, which are stimulated by means of the radioactive source o:E irradiation located in the probe. The -type and the character of a deposit can be determined by evaluating the fluorescent radiation. It can particularly be determined whether heavy metal or ferrous metal ores are present in the deposit.
For the determination of the fluorescent radiation, it was known to posi-tion a semi-conductor crystal in the probe, which, however, re~uires an extensive cooling assembly. The reflection of the radioac-tive irradiation occurred in the known probes over a large area. Also, the reception of the fluorescent radiation occurred over an extensive area~ so that a fine analysis o the composition of the deposits was not possible.
The execution of core borings of sligh~ diameter for the fine investigation of the vertical composition was known from this. These are, however, time-consuming and costly. Moreover, core damage can occur, so that the advantages are essentially lost. `
Through FR-PS l 387 139, a probe of the type under discussion is known, in which anaperture protects the radiation detector against the arrival of radiation -- 1 -- ~'i'~"
directly from the source o.E radioactive irradiation.
However, the irradiation angles of the radioactive irradiation source, as well. as their anyle o:E incidence on-to the detector, are so grea-t -that -the vertical de-composition is very slight, so that the findings abou-t these deposits are also very limited.
The basis of the inven-tion is the task of creating a probe of the type under discussion, by means of which the composition of deposits, especially ore mineral deposits, can be precisely scanned and analyzed, simply, cheaply, and quickly, and out of small-_aliber test drill holes, and with a small penetration area of the irradiation for transmission and reception.
The task which is the basis of the invention is solved through the pattern cited in the distinguishing mark of Patent Claim 1.
On the basis of the development of the aperture as specified by the invention, there o~curs a practically disk-shaped-irradiation of the drill hole wall, so that, in this way, only a narrow ring is irradiated, and thus stimulated to fluorescence. Fluorescent radiation is thereby collected only from this narrow ring surface by the receptor surface of the detecor, so that radiation from other areas does not impair the test results. There also occurs on the whole a greater decomposi-tion, which makes possible better findings about the mineral deposits.
In an advantageous manner, an increase of energy, throuyh reflections on the aperture walls, furthermore appears through the closely neighboring aperture surfaces.
Through the further development of the invention in accordance with Claim 2, the path of the rays ls improved for -the fluorescen-t radiation, so tha-t, in an advantageous manner, the detector can advance closer axially, so that the intensity of the radiation collected is increased, and, furthermore, the arrival of radiation from directions other than the one wanted is curbed. In this connection, the further development in accordance with Claim 3, by which the reception surface of the detector stands essentially vertical to the axis of the probe, is especially suitable~ It can also be slightly inclined, or, for example, even conically shaped.
On the basis of the disk-shaped radioactive irradiation, the opening area o~ the irradiation, through the wall of the housing, is likewise narrow, so that the material area of -the wall, which makes possible the pass-ing through of the radiation through the wall, can be measured corxespondingly small. The same applies to the area of the irradiation falling from the fluorescence source onto the reception surface of the detector.
The conical surface in which the external surface of the aperture lies, and the extension over the points of the cone, suitably intersect the reception surface, and therefore do not run past i-t externally, so that no ~Z~ 6 portion of the fluorescing radiation also impinges on -the borehole wa.ll wh.ich lies opposite, which can, undesirably, st.imulate further developmen-t.
In the diagram, the invention is more closely illustrated in an example of execution.
The diagram shows an example of execu-tion of a probe in accordance with the invention, par-tially cu-t away axially and partially cu-t axially, so that, in the cut area, a wall of a drill hole is indicated. The probe has a housing, in the internal space of which, coaxially to the housing, a radioactive source of irradiation is located, the irradiation of which passes through a slot to the outside, which slot is formed between two aperture parts. The radiation limited to the slot enters in-to the drill hole through a wall portion of the housing, and irradiates a wall area of the wall of the drill hole which lies between two points, and exhibits the form of a ring.
This area of the drill hole wall is stimulated for fluores-cence, according to the ores found in this area, and this fluorescent irradiation proceeds through a wall part lying between two projections aligned inwardly to the reception surface of a detector, which an be a scintil-lation detector or a semi-conductor detec-tor. The fluores-cence signal is transformed into an intelligence signal electrically depended on it.
The aperture part has an external surface directed to the reception surface of the detector, which surface is conical, and the extension of which, on the ouks:icie, meets approximately at point 11, that is, the approxirnate boundary of -the irradiated ri.ng of the wall of the dril:L
hole, which is axially deflected to the recep-tion surEace.
Because of the conical form, the fluorescent irradiation from the area of the ring can reach, substantially un- ¦
impaired, the entire reception surface of the detector.
The course of the radiation of the source of irradiation and of the fluorescent irradiation of the ring is indicated by the thin dotted line.
The housing is closed at the bottom by means of a housing part, only indicated, that is screwed into -the internal screw thread. In the same way, the housing is closed at the top by means of a housing part, which is screwed onto an external screw thread.
A coaxial cable extends out of the probe to a feeding device, by means o which the probe can be moved into the drill hole in a way that can be precisely determined. The current supply and transmission of the intelllgence signal from the detector to a plotting circuit (now shown), which is located outside of the drill hole, takes place by means of the coaxial cable.
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A probe for insertion into drill holes for the purpose of locating mineral deposits, with a cylindrical housing in which are concentrically arranged a radio-active irradiation source and a detector, which is opposite the source of irradiation, and is protected by an aperture, for determining the fluorescent irradiation stimulated by the radioactive irradiation in the area of the drill hole, distinguished by this: that the aperture forms a disk-shaped slot, adjustable in width, which runs essentially vertical to the axis of the probe, and extends to the internal wall of the housing.
2. A probe in accordance with Claim 1, distinguished by this: that the outer surface of the aperture turned to the reception surface lies in a conical surface coaxial to the probe, which intersects the boundary, demarcated by the reception surface, of the ring of the wall of the drill hole, which ring is precisely irradiated through the slot of the aperture.
3. A probe in accordance with Claim 2, distinguished by this: that the detector has a reception surface standing vertical to the axis of the probe, which is turned to the radiation source.
4. A probe in accordance with Claim 1, distinguished by this: that the wall portion of the housing in the area of the extension of the slot of the aperture, and in the area of the projection of the irradiated ring of the wall of the drill hole on the reception surface, consists of a material which poorly dampens the irradiation, preferably beryllium.
5. A probe in accordance with Claim 2, distinguished by this: that the conical surface, in which the external surface of the aperture lies, and the extension of the cone surface, intersect the reception surface above the point of the cone.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3312884A DE3312884C1 (en) | 1983-04-11 | 1983-04-11 | Probe for insertion into boreholes for the purpose of exploring ore deposits |
| DEP3312884.7 | 1983-04-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1221476A true CA1221476A (en) | 1987-05-05 |
Family
ID=6195921
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000451657A Expired CA1221476A (en) | 1983-04-11 | 1984-04-10 | Probe for insertion into drill holes for the purpose of locating mineral deposits |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0126219B1 (en) |
| JP (1) | JPS59197882A (en) |
| AT (1) | ATE32479T1 (en) |
| CA (1) | CA1221476A (en) |
| DD (1) | DD216506A5 (en) |
| DE (1) | DE3312884C1 (en) |
| FI (1) | FI82557C (en) |
| ZA (1) | ZA842669B (en) |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE718406C (en) * | 1938-12-03 | 1942-03-11 | Prospection Electr Procedes Sc | Method and device for the investigation of the layers penetrated by a borehole |
| US2578722A (en) * | 1950-05-18 | 1951-12-18 | United States Steel Corp | Apparatus for determining coating thickness |
| US2769918A (en) * | 1952-10-02 | 1956-11-06 | Gulf Research Development Co | Epithermal neutron logging method using collimation |
| US2830187A (en) * | 1954-01-22 | 1958-04-08 | Serge A Scherbatskoy | Radiation detector |
| US2909661A (en) * | 1954-09-02 | 1959-10-20 | Texaco Development Corp | Radioactivity borehole logging |
| US3061725A (en) * | 1958-03-03 | 1962-10-30 | California Research Corp | Comparison logging of geologic formation constituents |
| US3163761A (en) * | 1962-10-29 | 1964-12-29 | Texaco Inc | Radiological well logging using neutron collimator to reduce the effect of well fluid on the log |
| FR1389417A (en) * | 1963-04-01 | 1965-02-19 | Commissariat Energie Atomique | Dosing method and devices by applying |
| US3371574A (en) * | 1963-07-31 | 1968-03-05 | Robert J. Dwyer | Oil detection device utilizing raman radiation |
| FR1387139A (en) * | 1963-11-29 | 1965-01-29 | Texaco Development Corp | Improvements in methods and devices for radioactive sounding coring |
| US3321627A (en) * | 1966-10-07 | 1967-05-23 | Schlumberger Ltd | Gamma-gamma well logging comprising a collimated source and detector |
| US3609366A (en) * | 1968-11-01 | 1971-09-28 | Schlumberger Technology Corp | Systems for neutron decay time well logging |
| DE1960508A1 (en) * | 1969-12-02 | 1971-06-09 | Osoboje K Bjuro Ministerstwa G | Radioisotope X-ray fluorescence analyzer for elemental analysis of rocks and ores under natural storage conditions |
| DE2347037C3 (en) * | 1973-09-19 | 1980-01-24 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Measurement system of a borehole probe |
| US4168428A (en) * | 1977-07-14 | 1979-09-18 | Dresser Industries, Inc. | Sync transmission method and apparatus for high frequency pulsed neutron spectral analysis systems |
-
1983
- 1983-04-11 DE DE3312884A patent/DE3312884C1/en not_active Expired
-
1984
- 1984-02-24 AT AT84101971T patent/ATE32479T1/en active
- 1984-02-24 EP EP84101971A patent/EP0126219B1/en not_active Expired
- 1984-04-06 JP JP59067839A patent/JPS59197882A/en active Pending
- 1984-04-09 FI FI841388A patent/FI82557C/en not_active IP Right Cessation
- 1984-04-09 DD DD84261782A patent/DD216506A5/en not_active IP Right Cessation
- 1984-04-10 CA CA000451657A patent/CA1221476A/en not_active Expired
- 1984-04-11 ZA ZA842669A patent/ZA842669B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP0126219A1 (en) | 1984-11-28 |
| FI82557B (en) | 1990-11-30 |
| JPS59197882A (en) | 1984-11-09 |
| DD216506A5 (en) | 1984-12-12 |
| EP0126219B1 (en) | 1988-02-10 |
| FI841388A (en) | 1984-10-12 |
| ATE32479T1 (en) | 1988-02-15 |
| DE3312884C1 (en) | 1984-06-14 |
| FI841388A0 (en) | 1984-04-09 |
| ZA842669B (en) | 1984-11-28 |
| FI82557C (en) | 1991-03-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |