Gamma-ray logging


Gamma-ray logging



Gamma-ray logging "GS-7A"



The scintillation gamma spectrometer "GS-7A" is designed to measure gamma-ray spectra of rocks under natural conditions. The spectrometer can be used for work in the laboratory and in the field.

Solved problems

  • Lithological dismemberment of the investigated geological section
  • Isolation of reservoirs and determination of porosity
  • Determination of the mineral composition of clays
  • Determination of aquifers



Spectrometer "GS-7A" is a submersible detection unit, cable-rope, winch and an analog-to-digital converter unit.

The spectrometer includes a scintillation detector NaI (Tl), a photoelectron multiplier, a spectrometric path of the stabilization system, a high-voltage converter, and an analog-to-digital converter. The control is carried out by a personal computer. The detection unit is placed inside the moisture-proof housing.

This measuring system is automatic.



1 The relative energy resolution for 137Cs emission for each multichannel spectrum analyzer corresponds              to GOST 27451-87.

2. The range of energies of the detected gamma radiation is from 0.05 to 3 MeV.

3. The transformation characteristic is linear. Integral nonlinearity - no more than 1%.

4. The instability of the conversion characteristic during continuous operation does not exceed ± 2.0%.

5. Time to set the operating mode - no more than 10 minutes.

6. Continuous operation time is not less than 8 hours.

7. Mass of the spectrometer - depends on additional equipment

8. The power of the spectrometer is supplied from the source by a DC voltage (battery) voltage of 10-15 V.

9. The power consumed by the spectrometer in the operating mode at a nominal voltage value of not more          than 5 W.

10. The spectrometer is resistant to the influence of temperature and relative humidity in group B1, P1                 GOST 27451-87.



  •     Detection unit
  •     Winch (options are possible)
  •     Power supply 15 V
  •     Battery 12V, 7A * h
  •     Manual

The set of delivery can be supplemented or changed in accordance with the requirements of the Customer.