• 512 channels in the range of 0,1 to 3 MeV
  • 8 regions of interest (ROI) set from the panel
  • Internal memory for up to 7500 complete spectra
  • Pile-Up rejector to detect and discard double peaks
  • Automatic spectrum stabilization using typically 137Cs or 133Ba isotopes
  • PC program for transfer and processing data
  • Possible control from PC
  • Assay mode – K, U, Th in % or ppm
  • Dose rate in nG/h
  • Test pad calibration
  • Detector NaI 3″x 3″
  • Large LCD graphical display
  • GPS connection via Bluetooth
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GS-512i is a 512-channel gamma-ray spectrometer designed for field exploration of mineral deposits, gamma spectrometry, measuring of concentrations of naturally occurring isotopes K [%, nG / h], U [ppm, nG / h], Th [ppm, nG / h] and total activities in uranium equivalent concentration [ppm Ueq]. The GS-512i gamma spectrometer also allows users to set up to four ROI’s (Region Of Interest) to measure pulse counts in user-defined channels/energy ranges.

The GS-512i gamma-ray spectrometer allows inspection of stored spectra and data immediately after the end of the measurement in the field without the need for additional equipment. The measured and saved spectrum can be displayed with both linear and logarithmic y-axis for greater user comfort.

The GS-512i gamma-ray spectrometer has a built-on FLASH memory for storing up to 7,500 complete spectra. It is equipped with a pile-up rejector for the detection of double peaks, which enables a higher quality of the measured spectrum at high pulse rates. The GS-512i also performs spectrum stabilization, if enabled. The 137Cs reference source is supplied with the instrument to stabilize the measured spectrum. However, it is possible to use another reference source that must be well distinguishable from other radiation sources in the measured spectrum, with its peak in the range of 40-500 channels. If measuring on-site with high uranium concentration, the 133Ba radioisotope can be used as a reference source for a stabilization.

The GS-512i is powered by six LR6 AA batteries or rechargeable batteries. Rechargeable batteries with a charger are supplied. The external power supply can be used for mobile, laboratory, and stationary installations.

The GS-512i also allows, when measuring on a marked grid, automatic position increment for each measurement on a marked grid line. This simplifies the measurement; it is not necessary to set the position on the grid before each measurement. However, it is required to change the numberof the line by the operator when switching to a new line.

The GS-512i gamma-ray spectrometer enables communication with an external device using Bluetooth wireless technology. This allows the GS-512i to connect to an external GPS receiver, which can send the NMEA messages using the Bluetooth SPP protocol. If the GS-512i is connected to such a GPS receiver, the GPS location is saved with the measured spectrum. The GPS position can be used for further processing, for example, to create maps.

The GS-512i gamma-ray spectrometer can be remotely controlled with the SgDataGS PC application. The SgDataGS application allows the remote measurement and a configuration of the GS-512i. The communication between the GS-512i can be accomplished via USB or Bluetooth. The SgDataGS program is also used for data transfer, viewing, and sorting stored spectra. The measured values can also be exported to a text file for a further processing.

The GS-512i gamma-ray spectrometer is commonly sold with the 3-inch GSP-3 probe, which is best suited for field and general use. It is also possible to purchase 2-inch or 4-inch probes. The primary difference between these probes is the size of the scintillation crystal and their mechanical dimensions. You can find a comparison of the properties of the individual probes below in the Probes tab.

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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 input count rate 50 000 counts per second with a peak displacement, due to zero shift, inferior to 1 %
Channel Analyser The 512 channels, max. (232 – 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
Dimensions 228 x 83 x 110 mm
Weight 1.5 kg with batteries
  • Standard field geophysical survey
  • Laboratory gamma scintillation spectroscopy
  • Mobile survey
  • Drillhole measurements to a one-meter depth
Crystal size ø 51 x 51 mm (103 cm3 ) ø 76 x 76 mm (346 cm3 ) ø 101 x 101 mm (824 cm3 )
Photo-multiplier size ø 51 mm ø 76 mm ø 127 mm
Energy resolution FWHM for the energy 662 keV 137Cs
Better than 7.5 % Better than 7.5 % Better than 8.5 %
Dimensions ø 90 x 393 mm ø 120 x 410 mm ø 190 x 460 mm
Weight 1.6 kg 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
  • GS-512i Console
  • GSP-3 detection probe
  • Detection probe – console connection cable
  • Reference radiation source EG1 137Cs
  • USB cable
  • Instruction manual
  • Screwdriver
  • Shoulder strap
  • Transportation padded case
  • Charger
  • USB FLASH memory with calibration and communication program