Equipment: SGS-4 Stabilized Scintillation Gamma-radiation Spectrometer

Major properties

  • high-precision gamma-resonance measurements based on using of ultra-thin inorganic scintillation detector;

  • spectra viewing and storage in a PC;

  • PC-controlled discriminator levels;

  • high measurement productivity achieved by high-throughput digital processing system of input spectral signals;

  • excellent stability over time and measurement reproducibility assured by digital signal processing stabilizer system;

  • accumulation of mössbauer spectra.


Stabilized Scintillation Gamma-radiation Spectrometer (SGS-4) with single-channel differential amplitude discriminator is intended for 3 to 30 keV X-ray and gamma radiation registration and the accumulation of the mössbauer spectra.

Discrimination levels are PC controlled via serial RS-232 interface. After parameter setting, the device can be disconnected from PC and operate independently.

Win XP – style Graphic User Interface software allows device operation and spectra acquisition from standard PC.

Stabilized scintillation gamma-radiation spectrometer

Technical data

Gamma quanta registration efficiency, not less than

Iron-57 (=14.4 keV), %
Tin-119m (=23.8 keV), %
Dead time of amplitude discriminator, µs, not more than 0.65

Strobe output

Signal type +5 V (standard direct TTL)
Load resistance, Ohm 50 *
* If the connection cable more than 2 meters long then it is necessary to connect 50 Ohm load resistance on the other end of the cable

Spectrum output

Signal polarity Bipolar
Working half-wave Positive
Maximum distortion-free output, V
Load resistance, Ohm, not less than 1000

Start and Channel inputs

Input signal type Standard direct TTL
Working half-wave Negative


Number of channels 1024
Channel capacity 232

Power supply, V
Power consumption, W, less than 6
Overall dimensions, mm 182 x 66 x 90
Weight, g, less than 1000


SGS-4 software allows:

  • Automatic reading of spectral data from detector module to PC memory;

  • Discriminator levels setting from PC;

  • Switching between amplitude and mössbauer spectra;

  • Spectra viewing and analysis via user graphic interface;

  • Choosing number of channels for mössbauer spectra.

Amplitude spectra mode

Mössbauer accumulation mode

Device function graph and connection chart

Spectrometer function graph

  1. NaJ(Tl) scintillation detector
  2. Photomultiplier tube
  3. Preamplifier
  4. Signal amplifier
  5. LED
  6. LED impulse generator
  7. High voltage power supply
  8. Analog-digital converter (ADC)
  9. Field-programmable gate array (FPGA)
  10. Processing unit

SGS-4 connection to Mössbauer system

Technical description and manual in PDF format (596 kB)

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