CA2559516A1 - Detection of diamonds - Google Patents
Detection of diamonds Download PDFInfo
- Publication number
- CA2559516A1 CA2559516A1 CA002559516A CA2559516A CA2559516A1 CA 2559516 A1 CA2559516 A1 CA 2559516A1 CA 002559516 A CA002559516 A CA 002559516A CA 2559516 A CA2559516 A CA 2559516A CA 2559516 A1 CA2559516 A1 CA 2559516A1
- Authority
- CA
- Canada
- Prior art keywords
- particle
- diamond
- particles
- photons
- potentially
- 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.)
- Granted
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
- G01N23/221—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 by activation analysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/346—Sorting according to other particular properties according to radioactive properties
Abstract
The invention concerns a method and apparatus for detecting the presence of diamond in a particle and for sorting particles according to whether or not they include diamonds. In the method, the particle is irradiated (36) with photons of selected energy at which the GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, and the particle is identified as potentially a diamond or diamond-containing particle according to its interaction within the incident photons. In the preferred embodiments, the particle is identified (42) as potentially a diamond or diamond-containing particle according to whether the isotope 11C, with a characteristic half-life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction, and according to whether detectable coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particle.
Claims (19)
1.
A method of detecting the presence of diamond in a particle, wherein the particle is irradiated with photons of selected energy at which the GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, and identifying the particle as potentially a diamond or diamond-containing particle according to its interaction within the incident photons.
A method of detecting the presence of diamond in a particle, wherein the particle is irradiated with photons of selected energy at which the GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, and identifying the particle as potentially a diamond or diamond-containing particle according to its interaction within the incident photons.
2.
A method according to claim 1 wherein the particle is irradiated with bremsstrahlung encompassing a range of energy levels including a characteristic GDR energy level for carbon.
A method according to claim 1 wherein the particle is irradiated with bremsstrahlung encompassing a range of energy levels including a characteristic GDR energy level for carbon.
3.
A method according to claim 2 wherein the particle is irradiated with bremsstrahlung at a range of energy levels including a characteristic energy level of 22MeV.
A method according to claim 2 wherein the particle is irradiated with bremsstrahlung at a range of energy levels including a characteristic energy level of 22MeV.
4.
A method according to any one of the preceding claims comprising the steps of identifying the particle as potentially a diamond or diamond-containing particle according to whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction.
A method according to any one of the preceding claims comprising the steps of identifying the particle as potentially a diamond or diamond-containing particle according to whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction.
5.
A method according to claim 4 comprising the step of identifying the particle as potentially a diamond or diamond-containing particle according to whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particle.
A method according to claim 4 comprising the step of identifying the particle as potentially a diamond or diamond-containing particle according to whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particle.
6.
A method according to claim 5 wherein the particle is identified as potentially a diamond or diamond-containing particle according to whether coincident and collinear gamma ray photons at an energy level of 0.511 MeV are emitted by the particle.
A method according to claim 5 wherein the particle is identified as potentially a diamond or diamond-containing particle according to whether coincident and collinear gamma ray photons at an energy level of 0.511 MeV are emitted by the particle.
7.
A method according to either one of claims 5 or 6 comprising the step of analysing detected coincident and collinear gamma ray photons to provide an indication of the relative position of a concentrated carbon inclusion, potentially a diamond, in a particle which is host to such inclusion.
A method according to either one of claims 5 or 6 comprising the step of analysing detected coincident and collinear gamma ray photons to provide an indication of the relative position of a concentrated carbon inclusion, potentially a diamond, in a particle which is host to such inclusion.
8.
An on-line particle sorting method comprising the steps of irradiating particles with photons of gamma radiation at an energy level at which GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, identifying particles as potentially diamond or diamond-containing particles according to whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particles, and separating from other particles those particles which are identified as potentially diamond or diamond-containing particles.
An on-line particle sorting method comprising the steps of irradiating particles with photons of gamma radiation at an energy level at which GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, identifying particles as potentially diamond or diamond-containing particles according to whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particles, and separating from other particles those particles which are identified as potentially diamond or diamond-containing particles.
9.
An on-line particle sorting method according to claim 8 wherein, after irradiation, the particles are retained for at least twenty minutes before further analysis steps are carried out on the particles.
An on-line particle sorting method according to claim 8 wherein, after irradiation, the particles are retained for at least twenty minutes before further analysis steps are carried out on the particles.
10.
A method according to any one of claims 1 to 3 wherein the particle is identified as potentially a diamond or diamond-containing particle if absorption of photon energy by the particle is indicative of the presence of carbon in concentrated form.
A method according to any one of claims 1 to 3 wherein the particle is identified as potentially a diamond or diamond-containing particle if absorption of photon energy by the particle is indicative of the presence of carbon in concentrated form.
11.
A method according to claim 10 wherein the particle is a kimberlite particle and the method comprises the steps of deriving a differential energy absorption image for the particle and determining whether that image is indicative of the presence of a concentration of carbon in the particle.
A method according to claim 10 wherein the particle is a kimberlite particle and the method comprises the steps of deriving a differential energy absorption image for the particle and determining whether that image is indicative of the presence of a concentration of carbon in the particle.
12.
An apparatus for detecting the presence of diamond in a particle, the apparatus comprising means for irradiating the particle with photons of gamma radiation at a selected energy at which the GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, and means for identifying the particle as potentially a diamond or diamond-containing particle according to the interaction of the particle with the incident photons.
An apparatus for detecting the presence of diamond in a particle, the apparatus comprising means for irradiating the particle with photons of gamma radiation at a selected energy at which the GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon, and means for identifying the particle as potentially a diamond or diamond-containing particle according to the interaction of the particle with the incident photons.
13.
An apparatus according to claim 12 wherein the irradiation means is arranged to irradiate the particle with gamma radiation at an energy level of 22MeV.
An apparatus according to claim 12 wherein the irradiation means is arranged to irradiate the particle with gamma radiation at an energy level of 22MeV.
14.
An apparatus according to claim 12 or claim 13 comprising means for determining whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether pairs of coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particle.
An apparatus according to claim 12 or claim 13 comprising means for determining whether the isotope "C, with a characteristic half life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether pairs of coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particle.
15.
An apparatus according to claim 14 comprising means for determining whether coincident and collinear gamma ray photons at an energy level of 0.511 MeV are emitted by the particle.
An apparatus according to claim 14 comprising means for determining whether coincident and collinear gamma ray photons at an energy level of 0.511 MeV are emitted by the particle.
16.
An apparatus according to claim 14 or claim 15 comprising means for analysing detected coincident and collinear gamma ray photons to provide an indication of the relative position of a concentrated carbon inclusion, potentially a diamond, in a particle which is host to such inclusion.
An apparatus according to claim 14 or claim 15 comprising means for analysing detected coincident and collinear gamma ray photons to provide an indication of the relative position of a concentrated carbon inclusion, potentially a diamond, in a particle which is host to such inclusion.
17.
An on-line particle sorting apparatus comprising irradiation means for irradiating particles which are to be sorted with photons of gamma radiation at an energy level at which GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon and identification means for identifying particles as potentially diamond or diamond-containing particles according to whether the isotope "C, with a characteristic half-life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particles, and means for separating from other particles those particles which are identified as potentially diamond or diamond-containing particles.
An on-line particle sorting apparatus comprising irradiation means for irradiating particles which are to be sorted with photons of gamma radiation at an energy level at which GDR (giant dipole resonance) is excited for the nuclear reaction of the photons with carbon and identification means for identifying particles as potentially diamond or diamond-containing particles according to whether the isotope "C, with a characteristic half-life of approximately twenty minutes, is produced by the photon/carbon nuclear reaction and whether coincident and collinear gamma ray photons at a distinctive energy level are emitted by the particles, and means for separating from other particles those particles which are identified as potentially diamond or diamond-containing particles.
18.
An on-line particle sorting apparatus according to claim 17 including temporary storage means for retaining the particles for a period of at least twenty minutes before operation of the identification means.
An on-line particle sorting apparatus according to claim 17 including temporary storage means for retaining the particles for a period of at least twenty minutes before operation of the identification means.
19.
An on-line particle sorting apparatus according to claim 18 wherein the storage means comprises a hopper for holding the particles after irradiation and for releasing the particles to the identification means after it has held them for at least twenty minutes.
An on-line particle sorting apparatus according to claim 18 wherein the storage means comprises a hopper for holding the particles after irradiation and for releasing the particles to the identification means after it has held them for at least twenty minutes.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA2004/2010 | 2004-03-12 | ||
| ZA200402010 | 2004-03-12 | ||
| PCT/IB2005/000643 WO2005088283A1 (en) | 2004-03-12 | 2005-03-14 | Detection of diamonds |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2559516A1 true CA2559516A1 (en) | 2005-09-22 |
| CA2559516C CA2559516C (en) | 2012-07-10 |
Family
ID=34962210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2559516A Active CA2559516C (en) | 2004-03-12 | 2005-03-14 | Detection of diamonds |
Country Status (7)
| Country | Link |
|---|---|
| CN (1) | CN1942759B (en) |
| AP (1) | AP1986A (en) |
| AU (1) | AU2005220403B2 (en) |
| CA (1) | CA2559516C (en) |
| RU (1) | RU2334974C2 (en) |
| WO (1) | WO2005088283A1 (en) |
| ZA (1) | ZA200608025B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11415722B2 (en) * | 2017-10-19 | 2022-08-16 | University Of Johannesburg | Gamma ray tomographic radiography |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AP2011005890A0 (en) * | 2009-02-23 | 2011-10-31 | Tech Resources Pty Ltd | Detecting a mineral within a material. |
| GB2481283B (en) | 2010-06-03 | 2013-07-17 | Element Six Ltd | A method of increasing the toughness and/or wear resistance of diamond tool pieces and diamond tool pieces fabricated by said method |
| US20130186992A1 (en) * | 2010-08-04 | 2013-07-25 | Technological Resources Pty. Limited | Sorting mined material |
| RU2470714C1 (en) * | 2011-07-21 | 2012-12-27 | Общество с ограниченной ответственностью "Лаборатория рентгенодиагностических систем" | Method of separating diamonds |
| GB2504052B (en) * | 2012-03-16 | 2017-05-10 | De Beers Uk Ltd | Sorting aggregate material |
| RU2517148C1 (en) * | 2012-12-28 | 2014-05-27 | Евгений Матвеевич Лукьянченко | Method of useful material particles separation and device to this end |
| RU2521723C1 (en) * | 2013-03-01 | 2014-07-10 | Общество с ограниченной ответственностью "Нейтронные технологии" | Method and apparatus for detecting diamonds in kimberlite |
| RU2612734C2 (en) * | 2015-08-18 | 2017-03-13 | Общество с ограниченной ответственностью "Диамант" | Installation for dry enrichment of kimberlite ore by method of labelled neutrons |
| CN105499156B (en) * | 2015-12-02 | 2019-03-01 | 虞雅仙 | A kind of water drilling inspection method |
| RU2670677C9 (en) * | 2017-02-07 | 2019-09-13 | Акционерная компания "АЛРОСА" (публичное акционерное общество) "АК "АЛРОСА" (ПАО)) | Device for diamond separation |
| WO2020121214A1 (en) * | 2018-12-11 | 2020-06-18 | University Of Johannesburg | Detector arrangement, detection system and method of processing data from a detector arrangement for high throughput data handling |
| WO2020152618A1 (en) * | 2019-01-23 | 2020-07-30 | University Of Johannesburg | Detector arrangement, detection system and method of positioning a detector arrangement to reduce imaging artefacts |
| NL2026338B1 (en) * | 2020-08-25 | 2022-04-29 | Univ Johannesburg | Material analysis method and system |
| CN112024451B (en) * | 2020-08-28 | 2021-08-31 | 北京科技大学 | Ore sorting decision-making method based on analysis of operation characteristic curve of subject |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0059033A1 (en) * | 1981-02-24 | 1982-09-01 | Sphere Investments Limited | Ore sorting |
| US4428902A (en) * | 1981-05-13 | 1984-01-31 | Murray Kenneth M | Coal analysis system |
| US4756866A (en) * | 1985-10-09 | 1988-07-12 | Alvarez Luis W | Nitrogen detection |
| GB2219081B (en) * | 1988-05-06 | 1992-12-02 | Gersan Ets | Identifying specific objects or zones |
| GB2219394B (en) * | 1988-05-06 | 1992-09-16 | Gersan Ets | Sensing a narrow frequency band of radiation and examining objects or zones |
| US5334652A (en) * | 1991-06-18 | 1994-08-02 | Exxon Chemical Patents, Inc. | Polyester-based coating compositions having high pigment-to-binder ratios |
| CA2138503C (en) * | 1993-12-22 | 2004-10-12 | Ulf Anders Staffan Tapper | Method and apparatus for the classification of particulate matter |
| CA2139537C (en) * | 1994-01-07 | 2007-04-24 | Ulf Anders Staffan Tapper | Method and apparatus for the classification of matter |
| CN1363836A (en) * | 2001-08-18 | 2002-08-14 | 李晓蔚 | Method for judging natural product |
-
2005
- 2005-03-14 CN CN2005800116079A patent/CN1942759B/en not_active Expired - Fee Related
- 2005-03-14 ZA ZA200608025A patent/ZA200608025B/en unknown
- 2005-03-14 RU RU2006135960/28A patent/RU2334974C2/en active
- 2005-03-14 WO PCT/IB2005/000643 patent/WO2005088283A1/en active Application Filing
- 2005-03-14 AU AU2005220403A patent/AU2005220403B2/en active Active
- 2005-03-14 CA CA2559516A patent/CA2559516C/en active Active
-
2006
- 2006-09-29 AP AP2006003753A patent/AP1986A/en active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11415722B2 (en) * | 2017-10-19 | 2022-08-16 | University Of Johannesburg | Gamma ray tomographic radiography |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1942759A (en) | 2007-04-04 |
| AP2006003753A0 (en) | 2006-10-31 |
| RU2334974C2 (en) | 2008-09-27 |
| CA2559516C (en) | 2012-07-10 |
| WO2005088283A1 (en) | 2005-09-22 |
| AU2005220403B2 (en) | 2010-12-09 |
| AU2005220403A1 (en) | 2005-09-22 |
| CN1942759B (en) | 2011-01-12 |
| RU2006135960A (en) | 2008-04-20 |
| ZA200608025B (en) | 2008-06-25 |
| AP1986A (en) | 2009-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |