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.