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(11)    Patent No :    AP 1986   
(21)    Application No :    AP/P/2006/003753   
(22)    Filing Date :    14.03.2005   
(24)    Date of Grant &    01.04.2009   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2004/2010    12.03.2004

(84)    Designated State

BW  NA   ZW
 

(73) Applicant(s)

SELLSCHOP Susan  Marietta, P O Box 84385, Greenside,

Johannesburg, 2034, Gauteng,
South Africa

UNIVERSITY OF THE WITWATERSRAND, JOHANNESBURG,
Senate House, Jorissen Street, Johannesburg, Gauteng,

South Africa

(72) Inventors

SELLSCHOP Jaques, Pierre, Friedrich, South Africa

(74) Representative

FISHER CORMACK & BOTHA
 

(51)  International  Classification   B07C 5/346 (2006.01)    G01N 23/221 (2006.01)

(54)    Title

Detection of diamonds

(57)    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 <11>C, with a characteristic

half-life

of approximately twenty minutes, is produced by the photon/carbon nuclear


(56)    Documents Cited :    US 4 428 902 A    EP 00 590033 A

 

 

 

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