Gamma Surveyor is a group of multi-channel gamma-ray spectrometers designed for measurements of natural and artificial radioisotopes in ground, boreholes and laboratories.


This group of instruments covers a wide range of devices using various probes and types of detectors:

  • portable gamma-ray spectrometer for surface and borehole measurements
  • handheld gamma-ray spectrometer
  • compact version of the handheld gamma-ray spectrometer
  • accurate handheld radiameter
  • carborne spectrometer with high volume detector
  • laboratory spectrometer with special detectors and features


Gamma Surveyor offers three basic measuring modes:

  • Spectra & Assay – spectral measurements with determination of K, eU, eTh concentrations
  • Dose rate – precise radiometric measurements
  • Search – quick and selective search for gamma-ray sources (0.5 s response time)

The measuring system supports point, profile and continuous measurements as well as the use of external GPS data.



Manufactured by Geotomographie GmbH

Technical Details

Generated wave types: SV
Signal frequencies: Up to 500 Hz (depending on geology and borehole distance)
Operational depth: Up to 100 m
Source length: 1015 mm
Source weight: 6 kg
Cable weight per metre: 377 g
Borehole diameter: 75-100 mm (or larger if spacers are used)
Clamping system: Infatable bladder
Depth indicator: Cable marking every 2 m
Connector: To impulse generator IPG800 or IPG5000
Storage: On drum
Switch box: Switch between two vertical shot directions

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