GS-512i With GSP-3 Probe

GS-512i Main Console

GS-512i Main Console USB Connector

GS-512i Main Console Probe and Charger Connectors

GS-512i Accessory

GSP-3 Probe

SatisGeo GS-512i is designed to measure gamma-ray spectra in the 0.1 – 3 MeV range and the concentration of natural isotopes and total radioactivity. It includes a spectrum stabilization function that accurately determines the reference peak position from the multichannel spectrum. This allows precise reference peak adjustment within channels 40 to 500, ensuring highly accurate measurements. This spectrometer provides concentration data:

  • Potassium (K): [% or nG/h]
  • Uranium (U): [ppm or nG/h]
  • Thorium (Th): [ppm or nG/h]
  • Total activity: [ppm Ueq]

In addition, the GS-512i allows setting up to four user-defined ROIs (Region of Interest) for pulse measurements in user-defined energy ranges.

  • 512 channels in the range of 0,1 to 3 MeV
  • Eight regions of interest (ROI)
  • Internal memory for up to 7500 complete spectra
  • Pile-Up rejecter to detect and discard double peaks
  • Automatic spectrum stabilization using typically 137Cs or 133Ba isotopes
  • Assay mode – K, U, Th in % or ppm
  • Dose rate in nG/h
  • Test pad calibration
  • GPS connection via Bluetooth

  • Standard field geophysical survey
  • Mineral exploration
  • Environmental studies
  • Laboratory gamma scintillation spectroscopy
  • Mobile survey
  • Drillhole measurements to a one-meter depth

  • GSP-3: Standard 3-inch NaTi scintillation crystal probe suitable for most applications
  • GSP-4: Optional 4-inch NaTi scintillation crystal probe, available on request.
Probe GSP-3 GSP-4
Crystal size ø 76 x 76 mm (346 cm3 ) ø 101 x 101 mm (824 cm3 )
Photo-multiplier size ø 76 mm ø 127 mm
Energy resolution FWHM for the energy 662 keV 137Cs
Better than 7.5 % Better than 8.5 %
Dimensions ø 120 x 410 mm ø 190 x 460 mm
Weight 4.6 kg 6.8 kg
High voltage Stabilized high voltage power supply for the photomultiplier, range 800 – 1000 V adjustable inside detection probe after its opening
Pulse rise/fall time 0.5 μs / 22 μs
Max. output voltage + 3 V
Gain setting 10-turn potentiometer, accessible after detection probe housing removal. Recommended setting 0.5 V ±5 % for the energy 662 keV
Output impedance 100 Ω
Probe housing Aluminium, with water-resistant seals and thermal insulation
Reference source 137Cs, activity 10 kBq (0.28 microcurie) removable, accessible in an external mount at the base of the detection probe
Operating temp. range 0°C to +40°C
Storage temp. range –10°C to +50°C
Detector Sodium iodide, thallium activated NaI(Tl) scintillation crystal and photo-multiplier as a monoline scintiblock

  1. SINGLE
    • One-button manual start of measurement.
    • Measurement of individual spectra with adjustable measurement time (10 s to 24 h, 1 s step).
    • Allows setting of line and position with automatic position incrementation.
    • The GPS position is automatically stored if the GPS is active.
  2. MONITOR
    • Automatic measurement of spectra at a predefined interval.
    • Set the measurement’s start, interval, and end time and date.
    • The GPS position is automatically stored if the GPS is active.

Amplifier Semi-gaussian pulse shaping, 1 μs time constant with pole-zero cancellation, DC restoration, digitally controlled gain +/- 25 %
Analag/digital converter (ADC) Successive Approximation ADC, 16Bit, 1.33MSPS, conversion time 0.8 μs
Channel width 5 mV, input voltage range: 50 mV to 2.5 V
Differential non-linearity max. 1 % in the range 50 mV to 2.5 V
Integral non-linearity max. 0.3 % in the range 50 mV to 2.5 V
Zero drift 2 mV/10 °C
Maximum count rate 50 000 counts per second with a peak displacement, due to zero shift, inferior to 1 %
Channel Analyser The 512 channels, max. (322 – 1) counts per channel live time mode of collection setting in the range 5 s to 23:59:59
Digital Spectrum Stabiliser Range of reference peak setting is 40 – 500 channel, control range is ± 25 %, stabilization sensitivity 0.5 %
Internal data memory Memory for up to 7500 complete spectra
Interface USB 2.0 or Bluetooth for data transfer and remote control, Bluetooth can be used to connect to Bluetooth GPS
Keyboard  20 push-buttons membrane-type, dust resistant, water-tight, weather-proof
Display Graphical LCD 240 x 128 dots
Audio indication 1 kHz buzzer
Internal supply power 6 alkaline battery LR6 AA 1.5 V or 6 accumulators type HiMH 1.2 V
External supply power 8 – 15 V/400 mA
Size 228 x 83 x 110 mm
Weight 1.5 kg with batteries

The GS-512i gamma spectrometer allows communication with external devices using Bluetooth wireless technology. This enables the GS-512i to connect to an external GPS receiver that can send NMEA messages using the Bluetooth serial port protocol (SPP). The GPS position with the measured spectrum is stored when the GS-512i is connected to such a GPS receiver.

The GS-512i is calibrated to measure concentrations of natural radionuclides at the base in Stráž pod Ralskem. The sensor’s own radiation is calibrated in our facility, which shields background radiation.

  • 1 x Console GS-512i
  • 1 x Detection probe
  • 1 x Cable for connecting GS-512i to the probe
  • 1 x Reference sample EG1 137Cs
  • 1 x USB cable
  • 1 x Manual
  • 1 x Screwdriver
  • 1 x Shoulder straps
  • 1 x Charger
  • 1 x USB FLASH with operating program and calibration spectra
  • 1 x Carrying case

Document Language Date Size Description Download
GS-512i Manual.pdf EN 2015 564 kB Operational manul for the SatisGeo GS-512i.


GS-512i Guide.pdf EN 2015 200 kB Quick Guide for the SatisGeo GS-512i controls.


GS-512i Leaflet.pdf EN 2025 375 kB SatisGeo GS-512i leaflet.


Name Version Date Size Description Download
SgDataGS 1.09 2022 72 MB This is the zip archive with the installation package of the latest application, SgDataGS. The SgDataGS application provides data transfer and visualization to assess the data and exports for further processing. SgDataGS is also used to store and visualize measured data in REMOTE mode.


No new firmeae is avaliable for the GS-512i gamma-ray spectrometer

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