CA1219688A - Procedure for analysing ore blocks - Google Patents
Procedure for analysing ore blocksInfo
- Publication number
- CA1219688A CA1219688A CA000450079A CA450079A CA1219688A CA 1219688 A CA1219688 A CA 1219688A CA 000450079 A CA000450079 A CA 000450079A CA 450079 A CA450079 A CA 450079A CA 1219688 A CA1219688 A CA 1219688A
- Authority
- CA
- Canada
- Prior art keywords
- radiation
- blocks
- procedure
- excited
- ore
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
PROCEDURE FOR ANALYSING ORE BLOCKS
Abstract of Disclosure The invention concerns a procedure for analysing ore blocks wherein the ore blocks (5) are irradiated in order to determine the precious mineral contents in the surface of the blocks for sorting. The energies of the radiation sources have been so selected that with their aid is excited in the block (5) x-ray fluorescence radiation and Compton-scattered radiation, their intensities being measured with a detector (4). From the ratio of the radiation intensities a characteristic value is gained which characterizes the contents of precious minerals in the surface of the blocks (5) and which may be applied as a sorting criterion.
Abstract of Disclosure The invention concerns a procedure for analysing ore blocks wherein the ore blocks (5) are irradiated in order to determine the precious mineral contents in the surface of the blocks for sorting. The energies of the radiation sources have been so selected that with their aid is excited in the block (5) x-ray fluorescence radiation and Compton-scattered radiation, their intensities being measured with a detector (4). From the ratio of the radiation intensities a characteristic value is gained which characterizes the contents of precious minerals in the surface of the blocks (5) and which may be applied as a sorting criterion.
Description
Procedure for analysis ore blocks The present invention concerns a procedure for radlometrically analyslng ore blocks in said procedure the ore blocks briny India viduall~ irradiated with gamma radiation to the purpose of exciting x-ray fluorescence radiation and Compton-scattered radiation and the intensities of said radiations being mutually compared in order to determine the contents of precious minerals in the surface ox the blocks, for sorting the blocks.
In the art is known through the Finnish Patent No. 61 ~61~ the analyzing of ore for sorting by irradiating the blocks individually lo with two different energy gamma radiation sources and to study the scattering caused by the blocks with the aid of an energy-disper-size detector. With the aid of the detector eke intensity of scattered radiation is measured for each swallowers and from the ratio of these intensity values is formed the result value of analysis after first deducting the effect of background radiation from the values that have been measured. The result value reflects the proportion of heavy elements present in the block under examine-lion, and the block is sorted to go into the ore category if the result value surpasses a certain, desired threshold value.
In the course of diminishing mineral deposits in the world how-ever! increasingly lower trade minerals have to be processed, and this also involves the need to improve the accuracy of analysis achieved with apparatus and procedures known in the art taking into account in addition to the analysis contents of the irradiated part of the whole block also the potential concentration peaks present in the block eye. in the surface of the lump. In this case the result value obtained from the irradiated part of the whole block e.g. by the method of the Finnish Patent No. 61 ~61 may yield an end result which fat 15 short of the desired result value that is demanded of the ore.
~2~6~
The present invention seeks to provide a procedure in which the blocks to be analyzed are irradiated in-dividually with radiation, more especially gamma ray diction, for the purpose of sorting in such manner that interaction is achieved in the blocks for exciting x-ray fluorescence radiation and Compton-scattered ray diction and for determining with -their aid the content of precious minerals in the surface of the blocks.
In accordance with the invention there is provided, a procedure for analyzing ore blocks, wherein the ore blocks are irradiated individually with gamma radiation for accomplishing sorting on the basis of precious mineral contents in the ore block surface, comprising:
irradiating the ore blocks to excite the X-ray flyer-sconce radiation and Compton-scattered radiation;
measuring the intensities of the excited radiators with at least one detector; and comparing the measured in-densities with each other for eliciting the precious metal contents in the block surfaces.
In an especially preferred embodiment the blocks are irradiated with at least two gamma radiation sources to excite the X-ray fluorescence and Compton-scattered radiation, and at least one of the excited radiations is caused by a source of its own.
The procedure of the invention may be applied with ad-vantage either alone or in conjunction with a block-analysing'method known in itself, such as the so-called gamma scattering method known from Finnish Patent No. 61,361. When using the procedure of the invention in conjunction with the analyzing and sorting pro-seedier of Finnish Patent No. 61,361, one first per-forms by the procedure of the prior art a sorting of the block to ore or dead rock. In conjunction with or immediately after the analysis by the method -pa- ~2~9~8 of prior art, the blocks are irradiated as taught by the invention with gamma radiation for exciting x-ray fluorescence radiation. It is possible to use for the intensity value of the Compton-sca-ttered radiation according to the invention, the intensity value measured according to the method of the prior art if the energy of the source exciting the x-ray fluorescence radiation has been properly selected.
In that case one obtains from the intensity ratio of the x-ray fluorescence and Compton-scattered ray dilations measured by means of an energy-dispersive detector, a characteristic value which reflects the content of valuable metals in the surface of the block. When the characteristic value exceeds the desired threshold value, a block that was first classified as dead rock will be sorted in the ore category.
When using the procedure of the invention in con-junction with the analysis procedure of the prior art, it is possible to excite the x-ray fluorescence either with the aid of a gamma radiation source of its own or in the way that at least one of the ox-citatory energy sources in the block analyzing method is replaced with a target arrangement wherein in front of the primary source, or sources, is ..
I
placed a plate made of an appropriate element, e.g. an clement of the lantanide group.
The procedure of the invention may be used alone by itself when the x-ray fluorescence and the Compton scattering both are excited by their own primary source. In this easel too one obtains from the ratio of intensities measured with an energy-dispersive detector a characteristic value reflecting the content of precious minerals in the surface of the stone. This advantageous embodiment of the invention, too, can be used in conjunction with a bluck-analysing lo procedure of prior art, eye. the procedure of the Finnish Patent No. 61 3~1~ in which case the procedure of the present invention is advantageously applied only on those blocks which have been classic fled as dead neck in the analyzing procedure of prior art.
When applying the procedure of the invention the sorting of blocks is carried out by a procedure of prior art in that an air blast is directed with a compressed air nozzle against the brook meant to be deflected from the analysis line. With the aid of an electronic control circuit controlling the compressed air nozzle and serving as receiver for the signals supplied by the detector and in which in a way known in itself in the art has been predetermined a threshold value according to the present invention for separating between ore and dead neck.
: The invention is described in the following with reference to the attached drawings wherein:-.
Fig. 1 illustrates schematically an advantageous embodiment of the invention;
Fig. 2 illustrates schematically the embodiment of Fig. l in con-junction with the block analyzing method known through the Finnish Patent No. 61 361;
Fig. 3 illustrates schematically another embodiment of the invent lion when only x-ray fluorescence radiation is excited with a I it specific primary source;
Fig. 4 illustrates schematically an advantageous embodiment of the invention when the Roy fluorescence radiation primary source has been replaced with a target arrangement;
Fig. illustrates a photocell arrangement common to the embody-mints of Figs l to 4, or determining the time for analyzing the blocks.
As shown in Fig. 1, when the procedure is applied alone by itself by action of the radiation source 1 is excited x-ray fluorescence 0 radiation in the block 5 constituting the object and by action of the radiation source 2J Compton-scattered radiation. For measuring the intensities of the radiations thus excited, there has been placed within the radiation shield 3 a detector I, for instance an energy-dispersively Dperatin~ scintillation detector. The signals lo or pulses from the detector are received by the electronic control circuit 1~3 which from the measured intensity values forms the sorting characteristic value according to the invention and which has been further connected to control the compressed air Noah 15. The characteristic value that has been wormed it come pared with a preset threshold value, in accordance with which the block 5 is sorted to go either to the valuable ore category or to the valueless dead rock category.
In the advantageous embodiment of Fig. I the analyzing procedure known through the Finnish Patent Jo. 61 361 has been combined with the procedure design illustrated by Fly. l. In this case, the block S to be analyzed is irradiated with two mamma radiation sources 6;7J the energy of one ox them being 50 selected that the Compton interaction is dominant while in the other photoelectric inter-action and Compton interaction compete with each other. The intent sties emitted by the block 5 are measured by means Do the detector in the radiation shield I. The signals from the detector are conducted to an electronic control circuit 16, where of the intent sties is formed a characteristic value as taught by the Finnish ~23L96~3~
s Patent No. 61 361J and in which the characteristic value and a preset threshold value are compared for sorting the block S. When the characteristic value falls short of the threshold value, the block S is defined to be dead rock pa, which it moved by the aid of the air jet from the compressed air nozzle to go to the left of the radiation partition 13 in Fig. 2. The blocks Spa designated by the analysis to be dead rock are further analyzed by the procedure of the present invention. This is effected with an apparatus like that of Fig. 1 and shown in the lower part of Fig. I the ratio of the intensities of the x-ray fluorescence radiation and Compton-scattered radiation measured with the detector 4 being processed to give a characteristic value as taught by the invention, this char-acteristic value owing compared with a threshold value preset in the electronic control circuit 14. When now the characteristic value surpasses the threshold value, the block pa is designated to be ore, on which by the compressed air nozzle 15 is directed an air jet to move the block over among the ore blocks 5.
In the embodiment of the invention depicted in Fig. I there has been added within the radiation shield 8 of the apparatus arrange-mint according to the Finnish Patent No. 61 361 fig. 2, top purity a radiation source 1 exciting x-ray fluorescence. For source exalt-in the Compton scattering radiation required for implementation of the procedure of the present invention is then used the source 71 which thus is common to the analyzing modes according to the I Finnish Patent No. 61 361 and to the present invention. If the characteristic value in the sorting according to the Finnish Patent No. 61 361 falls below the level required of ore, the caricaturist-to value found in the analysis according to the present invention will also be taken into account. When the last-mentioned kirk-touristic value surpasses the level which Dye is required to meet the analyzed block 5 will be classified as ore.
In the apparatus set-up of Fig. 4, the x-ray fluorescence radian tion-excitin~ source 2 has been replaced with a target arrangement by disposing in front of one or the other radiation source of the Finnish Patent Jo. 61 361 a ovate 101 advantageously made e.g. of go an element of the lantanide group.
In the advantageous embodiments of Figs 3 and I the sorting of blocks is effected as shown in Fig. 1, employing an electronic control circuit I and a compressed air nozzle 15.
To the purpose of determining the starting point of the analysis measurement, there has been disposed, slightly above the primary sourcetdetector assembly a photocell 11l substantially similar for each embodiment presented, which observes the arriving block 5 as it interrupts the light beam between the light source 12 and the photocell 11.
In the procedure of the invention, when it is being used in con-junction with a method of analysis known in the anti such as the gamma scattering method known through the Finnish Patent No.
61 361l it is possible to use for x-ray fluorescence radiation source a source with about 30-lS0 key energy such as Am-241, and for Compton radiation source a source with energy level about 300-1500 key, such as Shea. When the procedure of the invention it applied as shown in Fig. 1 alone by itself, the energy level of the x-ray fluorescence radiation source will be lower, about cove.
In the art is known through the Finnish Patent No. 61 ~61~ the analyzing of ore for sorting by irradiating the blocks individually lo with two different energy gamma radiation sources and to study the scattering caused by the blocks with the aid of an energy-disper-size detector. With the aid of the detector eke intensity of scattered radiation is measured for each swallowers and from the ratio of these intensity values is formed the result value of analysis after first deducting the effect of background radiation from the values that have been measured. The result value reflects the proportion of heavy elements present in the block under examine-lion, and the block is sorted to go into the ore category if the result value surpasses a certain, desired threshold value.
In the course of diminishing mineral deposits in the world how-ever! increasingly lower trade minerals have to be processed, and this also involves the need to improve the accuracy of analysis achieved with apparatus and procedures known in the art taking into account in addition to the analysis contents of the irradiated part of the whole block also the potential concentration peaks present in the block eye. in the surface of the lump. In this case the result value obtained from the irradiated part of the whole block e.g. by the method of the Finnish Patent No. 61 ~61 may yield an end result which fat 15 short of the desired result value that is demanded of the ore.
~2~6~
The present invention seeks to provide a procedure in which the blocks to be analyzed are irradiated in-dividually with radiation, more especially gamma ray diction, for the purpose of sorting in such manner that interaction is achieved in the blocks for exciting x-ray fluorescence radiation and Compton-scattered ray diction and for determining with -their aid the content of precious minerals in the surface of the blocks.
In accordance with the invention there is provided, a procedure for analyzing ore blocks, wherein the ore blocks are irradiated individually with gamma radiation for accomplishing sorting on the basis of precious mineral contents in the ore block surface, comprising:
irradiating the ore blocks to excite the X-ray flyer-sconce radiation and Compton-scattered radiation;
measuring the intensities of the excited radiators with at least one detector; and comparing the measured in-densities with each other for eliciting the precious metal contents in the block surfaces.
In an especially preferred embodiment the blocks are irradiated with at least two gamma radiation sources to excite the X-ray fluorescence and Compton-scattered radiation, and at least one of the excited radiations is caused by a source of its own.
The procedure of the invention may be applied with ad-vantage either alone or in conjunction with a block-analysing'method known in itself, such as the so-called gamma scattering method known from Finnish Patent No. 61,361. When using the procedure of the invention in conjunction with the analyzing and sorting pro-seedier of Finnish Patent No. 61,361, one first per-forms by the procedure of the prior art a sorting of the block to ore or dead rock. In conjunction with or immediately after the analysis by the method -pa- ~2~9~8 of prior art, the blocks are irradiated as taught by the invention with gamma radiation for exciting x-ray fluorescence radiation. It is possible to use for the intensity value of the Compton-sca-ttered radiation according to the invention, the intensity value measured according to the method of the prior art if the energy of the source exciting the x-ray fluorescence radiation has been properly selected.
In that case one obtains from the intensity ratio of the x-ray fluorescence and Compton-scattered ray dilations measured by means of an energy-dispersive detector, a characteristic value which reflects the content of valuable metals in the surface of the block. When the characteristic value exceeds the desired threshold value, a block that was first classified as dead rock will be sorted in the ore category.
When using the procedure of the invention in con-junction with the analysis procedure of the prior art, it is possible to excite the x-ray fluorescence either with the aid of a gamma radiation source of its own or in the way that at least one of the ox-citatory energy sources in the block analyzing method is replaced with a target arrangement wherein in front of the primary source, or sources, is ..
I
placed a plate made of an appropriate element, e.g. an clement of the lantanide group.
The procedure of the invention may be used alone by itself when the x-ray fluorescence and the Compton scattering both are excited by their own primary source. In this easel too one obtains from the ratio of intensities measured with an energy-dispersive detector a characteristic value reflecting the content of precious minerals in the surface of the stone. This advantageous embodiment of the invention, too, can be used in conjunction with a bluck-analysing lo procedure of prior art, eye. the procedure of the Finnish Patent No. 61 3~1~ in which case the procedure of the present invention is advantageously applied only on those blocks which have been classic fled as dead neck in the analyzing procedure of prior art.
When applying the procedure of the invention the sorting of blocks is carried out by a procedure of prior art in that an air blast is directed with a compressed air nozzle against the brook meant to be deflected from the analysis line. With the aid of an electronic control circuit controlling the compressed air nozzle and serving as receiver for the signals supplied by the detector and in which in a way known in itself in the art has been predetermined a threshold value according to the present invention for separating between ore and dead neck.
: The invention is described in the following with reference to the attached drawings wherein:-.
Fig. 1 illustrates schematically an advantageous embodiment of the invention;
Fig. 2 illustrates schematically the embodiment of Fig. l in con-junction with the block analyzing method known through the Finnish Patent No. 61 361;
Fig. 3 illustrates schematically another embodiment of the invent lion when only x-ray fluorescence radiation is excited with a I it specific primary source;
Fig. 4 illustrates schematically an advantageous embodiment of the invention when the Roy fluorescence radiation primary source has been replaced with a target arrangement;
Fig. illustrates a photocell arrangement common to the embody-mints of Figs l to 4, or determining the time for analyzing the blocks.
As shown in Fig. 1, when the procedure is applied alone by itself by action of the radiation source 1 is excited x-ray fluorescence 0 radiation in the block 5 constituting the object and by action of the radiation source 2J Compton-scattered radiation. For measuring the intensities of the radiations thus excited, there has been placed within the radiation shield 3 a detector I, for instance an energy-dispersively Dperatin~ scintillation detector. The signals lo or pulses from the detector are received by the electronic control circuit 1~3 which from the measured intensity values forms the sorting characteristic value according to the invention and which has been further connected to control the compressed air Noah 15. The characteristic value that has been wormed it come pared with a preset threshold value, in accordance with which the block 5 is sorted to go either to the valuable ore category or to the valueless dead rock category.
In the advantageous embodiment of Fig. I the analyzing procedure known through the Finnish Patent Jo. 61 361 has been combined with the procedure design illustrated by Fly. l. In this case, the block S to be analyzed is irradiated with two mamma radiation sources 6;7J the energy of one ox them being 50 selected that the Compton interaction is dominant while in the other photoelectric inter-action and Compton interaction compete with each other. The intent sties emitted by the block 5 are measured by means Do the detector in the radiation shield I. The signals from the detector are conducted to an electronic control circuit 16, where of the intent sties is formed a characteristic value as taught by the Finnish ~23L96~3~
s Patent No. 61 361J and in which the characteristic value and a preset threshold value are compared for sorting the block S. When the characteristic value falls short of the threshold value, the block S is defined to be dead rock pa, which it moved by the aid of the air jet from the compressed air nozzle to go to the left of the radiation partition 13 in Fig. 2. The blocks Spa designated by the analysis to be dead rock are further analyzed by the procedure of the present invention. This is effected with an apparatus like that of Fig. 1 and shown in the lower part of Fig. I the ratio of the intensities of the x-ray fluorescence radiation and Compton-scattered radiation measured with the detector 4 being processed to give a characteristic value as taught by the invention, this char-acteristic value owing compared with a threshold value preset in the electronic control circuit 14. When now the characteristic value surpasses the threshold value, the block pa is designated to be ore, on which by the compressed air nozzle 15 is directed an air jet to move the block over among the ore blocks 5.
In the embodiment of the invention depicted in Fig. I there has been added within the radiation shield 8 of the apparatus arrange-mint according to the Finnish Patent No. 61 361 fig. 2, top purity a radiation source 1 exciting x-ray fluorescence. For source exalt-in the Compton scattering radiation required for implementation of the procedure of the present invention is then used the source 71 which thus is common to the analyzing modes according to the I Finnish Patent No. 61 361 and to the present invention. If the characteristic value in the sorting according to the Finnish Patent No. 61 361 falls below the level required of ore, the caricaturist-to value found in the analysis according to the present invention will also be taken into account. When the last-mentioned kirk-touristic value surpasses the level which Dye is required to meet the analyzed block 5 will be classified as ore.
In the apparatus set-up of Fig. 4, the x-ray fluorescence radian tion-excitin~ source 2 has been replaced with a target arrangement by disposing in front of one or the other radiation source of the Finnish Patent Jo. 61 361 a ovate 101 advantageously made e.g. of go an element of the lantanide group.
In the advantageous embodiments of Figs 3 and I the sorting of blocks is effected as shown in Fig. 1, employing an electronic control circuit I and a compressed air nozzle 15.
To the purpose of determining the starting point of the analysis measurement, there has been disposed, slightly above the primary sourcetdetector assembly a photocell 11l substantially similar for each embodiment presented, which observes the arriving block 5 as it interrupts the light beam between the light source 12 and the photocell 11.
In the procedure of the invention, when it is being used in con-junction with a method of analysis known in the anti such as the gamma scattering method known through the Finnish Patent No.
61 361l it is possible to use for x-ray fluorescence radiation source a source with about 30-lS0 key energy such as Am-241, and for Compton radiation source a source with energy level about 300-1500 key, such as Shea. When the procedure of the invention it applied as shown in Fig. 1 alone by itself, the energy level of the x-ray fluorescence radiation source will be lower, about cove.
Claims (8)
1. A procedure for analysing ore blocks, where-in the ore blocks are irradiated individually with gamma radiation for accomplishing sorting on the basis of precious mineral contents in the ore block surface, comprising:
irradiating the ore blocks to excite X-ray fluorescence radiation and Compton-scattered radia-tion; measuring the intensities of the excited radia-tions with at least one detector; and comparing the measured intensities with each other for eliciting the precious metal contents in the block surfaces.
irradiating the ore blocks to excite X-ray fluorescence radiation and Compton-scattered radia-tion; measuring the intensities of the excited radia-tions with at least one detector; and comparing the measured intensities with each other for eliciting the precious metal contents in the block surfaces.
2. A procedure according to claim 1, wherein as a parameter describing the result of sorting there is selected the ratio between the intensity of x-ray fluorescence radiation and the intensity of Compton-scattered radiation.
3. A procedure according to claim 1, wherein the x-ray fluorescence radiation and the Compton-scattered radiation are excited each with a radiation source of its own.
4. A procedure according to claim 1 or 2, wherein the x-ray fluorescence radiation is excited with a radiation source of its own.
5. A procedure according to claim 1 or 2, where-in the x-ray fluorescence radiation is excited with the aid of a target plate placed in front of at least one primary source used in the analysis of blocks.
6. A procedure according to claim 1 or 2, where-in the Compton-scattered radiation is excited with a radiation source of its own.
7. A procedure according to claim 1 or 2, where-in said at least one detector comprises at least one energy-dispersively operating scintillation de-tector.
8. A procedure for analysing ore blocks, where-in the ore blocks are irradiated individually with gamma radiation for accomplishing sorting on the basis of precious mineral contents in the ore block surface, comprising:
irradiating the ore blocks with at least two gamma radiation sources to excite X-ray fluore-scence radiation and Compton-scattered radiation, at least one of said excited radiations being caused by a source of its own; measuring the intensities of the excited radiations with at least one detector;
and comparing the measured intensities with each other for eliciting the precious metal contents in the block surfaces.
irradiating the ore blocks with at least two gamma radiation sources to excite X-ray fluore-scence radiation and Compton-scattered radiation, at least one of said excited radiations being caused by a source of its own; measuring the intensities of the excited radiations with at least one detector;
and comparing the measured intensities with each other for eliciting the precious metal contents in the block surfaces.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI830967 | 1983-03-23 | ||
| FI830967A FI67626C (en) | 1983-03-23 | 1983-03-23 | FOERFARANDE FOER ANALYZING AV MALMBLOCK |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1219688A true CA1219688A (en) | 1987-03-24 |
Family
ID=8516939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000450079A Expired CA1219688A (en) | 1983-03-23 | 1984-03-21 | Procedure for analysing ore blocks |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU570440B2 (en) |
| BR (1) | BR8401417A (en) |
| CA (1) | CA1219688A (en) |
| FI (1) | FI67626C (en) |
| SE (1) | SE8401395L (en) |
| ZA (1) | ZA842052B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993017326A1 (en) * | 1992-02-29 | 1993-09-02 | Sedco Forex Technology Inc | Analysis of drilling fluids |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1389417A (en) * | 1963-04-01 | 1965-02-19 | Commissariat Energie Atomique | Dosing method and devices by applying |
| AU530206B2 (en) * | 1979-06-26 | 1983-07-07 | De Beers Industrial Diamond Division (Proprietary) Limited | Detection of low atomic number particles |
| FI61361C (en) * | 1980-09-15 | 1982-07-12 | Outokumpu Oy | FRAMEWORK FOR ANALYSIS FOAL ANALYSIS AV MALM MED ANVAENDNING AV GAMMASTRAOLNING |
-
1983
- 1983-03-23 FI FI830967A patent/FI67626C/en not_active IP Right Cessation
-
1984
- 1984-03-13 SE SE8401395A patent/SE8401395L/en unknown
- 1984-03-20 ZA ZA842052A patent/ZA842052B/en unknown
- 1984-03-21 CA CA000450079A patent/CA1219688A/en not_active Expired
- 1984-03-21 AU AU25930/84A patent/AU570440B2/en not_active Ceased
- 1984-03-23 BR BR8401417A patent/BR8401417A/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993017326A1 (en) * | 1992-02-29 | 1993-09-02 | Sedco Forex Technology Inc | Analysis of drilling fluids |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8401417A (en) | 1984-11-06 |
| AU570440B2 (en) | 1988-03-17 |
| FI830967L (en) | 1984-09-24 |
| SE8401395L (en) | 1984-09-24 |
| SE8401395D0 (en) | 1984-03-13 |
| AU2593084A (en) | 1984-09-27 |
| ZA842052B (en) | 1984-10-31 |
| FI830967A0 (en) | 1983-03-23 |
| FI67626B (en) | 1984-12-31 |
| FI67626C (en) | 1985-04-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |