CORAD Ltd

CORAD Limited

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Design, manufacture, installation and service of linear electron accelerators and facilities with these accelerators
Design, manufacture, installation and service of X-ray sources and high voltage pulse generators for various applications with parameters meeting specific needs of customers
Gamma-activation analysis of gold ores

Facility for Gamma-activation Analysis of Gold Ores

Facility for Gamma-activation Analysis of Gold Ores Linear accelerator made by CORAD Ltd Container with ore Container with an ore sample opposite the accelerator target
Facility for Gamma-activation Analysis of Gold Ores
Linear accelerator made by CORAD Ltd
Container with ore
Container with an ore sample opposite the accelerator target

The device will be made on the basis of 8 MeV, 10 kW linear accelerator. The semiconductor spectrometers based on High Pure Germanium (HPGe) from Baltic Scientific Instruments (Riga) will be applied as gamma-ray spectrometers.

Basic technical characteristics

  • Gamma-activation analysis (GAA) provides measurement of gold concentration in ore with the accuracy over +/-30%;
  • GAA is not a destructive method (an ore sample is not destroyed and can be measured multiple times);
  • The sizes of sample particles should be less than 3.0 mm (does not require abrasion);
  • The weights of samples ~ 500 g;
  • Sensitivity - 0,1 g/t;
  • Throughput for samples with gold concentration more than 0,5 g/t – at least of 60 samples/hour.

The prototype of this device has been installed at the premises with radiation shielding of the CORAD Ltd. company. The prototype applies less powerful linear accelerator of 8 MeV and only one HPGe detector. Also there is no sample automatic transportation system. Therefore, the analysis period for one sample is~10 minutes. However, the prototype has a good accuracy of measurement of gold concentration in standard samples and allows GAA technology clear demonstration. The device provides determination and measurement of many other elements except gold as follows: Ag, Se, Br, Y, Cd, W, Hf and other.

The diagram of gold concentration in standard samples of gold-bearing ores

The diagram above shows the linear dependence of gold concentration in standard samples of gold-bearing ores on the signal level at the output of the spectrometer reduced to 1 g of mass. The diagram applies the standard samples of NTC Minstandard Ltd:

Sampleg/t
MST SG147f0,312
MST Gq157d0,85
MST Gq158e1,13
MST G-160e2,87
MST G173e3
MST G-144e4,75
MST Gq-109F7,25
The MST standard sample spectrum G173e - 3.0 g/t
The MST standard sample spectrum G173e - 3.0 g/t

The spectrum shows the lines of the uranium-thorium series: 41.3, 396, 508, 537, 598, 771, 1312, 1356 keV. It is seen that they do not interfere with the gold line of 279 keV.



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