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Gamma-activation analysis unit for gold-bearing ores Au-isomer
The operating principle of the unit is based on the excitation of gold isomer with energy 279 keV and half-life 7.5 sec by braking radiation of a linear electron accelerator and its subsequent registration by spectrometers based on high-purity germanium.
Main technical characteristics of the unit
Capacity
Au-isomer
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Height together with a crane designed for assembly and disassembly of radiation shielding
height
4.1 m
length
width
weight
7 m
110 t
4 m
Components and dimensions
Unit width excluding chiller and klystron modulator
Unit weight
Unit length
for samples with gold content less than 0.2 g/t
21 samples/hour
for samples with gold content over 0.4 g/t
85 samples/hour
for samples with gold content of 0.2 - 0.4 g/t
42 samples/hour
Gamma-activation analysis unit for gold-bearing ores Au-isomer
The operating principle of the unit is based on the excitation of gold isomer with energy 279 keV and half-life 7.5 sec by braking radiation of a linear electron accelerator and its subsequent registration by spectrometers based on high-purity germanium.
Main technical characteristics of the unit
Capacity
Au-isomer
Height together with a crane designed for assembly and disassembly of radiation shielding
height
4.1 m
length
width
weight
7 m
110 t
4 m
Components and dimensions
Unit width excluding chiller and klystron modulator
Unit weight
Unit length
for samples with gold content less than 0.2 g/t
21 samples/hour
for samples with gold content over 0.4 g/t
85 samples/hour
for samples with gold content of 0.2 - 0.4 g/t
42 samples/hour
Do you have any
questions?
Leave your contact details and our experts will get back to you soon. We’ll gladly solve any question you need.
Sample volume
300 ml
СО
СО
г/т
г/т
VIMS217GO
VIMS213GO
24.8
1.27
MST 209
MST Gq157d
24.3
0.85
VIMS216GO
MST G172f
VIMS212GO
11.5
VIMS211GO
0.4
VIMS215GO
MST SG147f
8.4
8.44
0.312
MST G173e
OREAS 682
0.16
3
VIMS214GO
MST SGBlank10
0.074
2.38
<0.005
Output electron energy of the linear accelerator
7-9 MeV
Installation test results
The unit tests were carried out using standard samples (SS) of FSBI "VIMS", made on the basis of ore of PAVLIK deposit, samples of LLC "STC "Minstandart", based on quartz sand and one SS of OREAS company (Australia):
Maximum beam power on accelerator target
10 kW
Maximum power consumption
70 kW
Ore crushing for measurements
up to 1-3 mm
Radiation background on the surface of the enclosure not more than
1 μSv/h
Installation test results
The unit tests were carried out using standard samples (SS) of FSBI "VIMS", made on the basis of ore of PAVLIK deposit, samples of LLC "STC "Minstandart", based on quartz sand and one SS of OREAS company (Australia):
СО
г/т
VIMS217GO
24.8
VIMS213GO
1.27
MST 209
MST Gq157d
MST G172f
24.3
0.85
VIMS216GO
VIMS211GO
VIMS212GO
11.5
0.4
MST SG147f
VIMS215GO
8.4
8.44
0.312
MST G173e
OREAS 682
0.16
3
VIMS214GO
MST SGBlank10
0.074
2.38
<0.005
Sample volume
300 ml
Ore crushing for measurements
up to 1-3 mm
Output electron energy of the linear accelerator
7-9 MeV
Maximum power consumption
70 kW
Maximum beam power on accelerator target
10 kW
Radiation background on the surface of the enclosure not more than
1 μSv/h
The measurement results of 13 CRM samples are shown in 22 minutes, because for samples less than 1 g/t we averaged over 2-4 measurements. The unit automatically directs samples for repeated measurements in case of insufficient statistics of results of one measurement and averages the results of several measurements. As can be seen from the above results, the unit provides measurements of gold content by the 3rd category of accuracy according to OST 41-08-212-04.
Calibration of the unit was carried out using MST 203 SSs with gold content of 24.3 g/t, VIMS212GO with gold content of 0.4 g/t and MST SGBlank10 with gold content less than 0.005 g/t. The electron energy and beam current of the accelerator are maintained at the set level with an accuracy of not worse than 2%, but nevertheless, the measurement technique includes calibration of the three SSs every 4 hours.
The Au-isomer unit uses the same scheme of moving containers with samples and the same irradiation scheme as in the units of NMMC (Muruntau) and JSC "Yangeologiya" (Batagai) commissioned in 1977 and 1986, respectively. More than 40 years of operating experience showed that the movement of containers with samples under the action of gravity provides reliable uninterrupted operation of the units due to the simplicity of the design. In the Au-isomer facility, by curving the transport channels and installing two fast flaps, it was possible to place the entire structure in an iron radiation shield 230 cm high (Patent No. 203146 of 25.01.2021).
The radiation shielding of the Au-isomer unit consists of iron blocks weighing no more than 2.4 tonnes. To assemble the shielding, a crane is used as part of the installation. To service the accelerator, the 5 rear blocks are removed and the accelerator is rolled out of the radiation shield. This procedure takes no more than 20 minutes. The facility is mobile as it can be disassembled and moved to another location in 4 40 ft containers.
The method "Determination of gold in rocks, ores and products of their processing by gamma-activation analysis using linear electron accelerator UELR-8-10A" was developed and passed metrological certification in the Federal State Unitary Enterprise The D.I. Mendeleev All-Russian Institute for Metrology (certificate №2121/209-(RA.RURU10494)-2021 from 17.12.2021). This methodology was performed as a validation and implementation of the industry methodology Scientific Council on Analytical Research Methods #264-NP-2017 and differs from it by the composition of the equipment used: instead of the accelerator LUEV-8A was used a modern accelerator with more stable parameters of the electron beam UELR-8-10A produced by LLC CORAD was used, and instead of scintillation spectrometers with NaI(Tl) crystal at the input, modern spectrometers with crystal from extremely pure germanium were used, which have significantly higher energy resolution. The range of gold mass fraction measurement according to this technique was confirmed according to the III category of accuracy according to OST 41-08-212-04 in the range of 0.07 - 40 g/t on standard samples made on the matrix of PAVLIK deposit.
Linear accelerator manufacturing
and design
Research and Production Enterprise CORAD
84 AZH, Revolution Highway,
St. Petersburg, 195248, Russia
Ionising product treatment
Kaluga Scientific and Technical Enterprise CORAD
4, 1st Industrial Street,
v. Staromikhailovskoye, Borovsky District, Kaluga Region, 249010, Russia
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