AT1120M, AT1120MA Spectrometers/RIIDs

Sensitive spectrometer / radioisotope identification device for search, detection, and identification of low activity materials and radiation sources, as well as for measuring ambient dose equivalent rate of X-ray and gamma radiation.

  • High sensitivity and quick accommodation to changes in radiation level
  • Short measurement cycle (1/3 s) provided by the search algorithm, enables highly confident estimation of rapidly changing radiation field dynamics and highly precise localization of radioactive sources
  • Continuously recorded scanning data with GPS georeferencing
  • Voice messaging option for identification results
  • Expert “GARM” software for further data processing and analysis

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AT1120M AT1120MA
Detection unit (DU) BDKG-11M BDKG-05M
Processing unit (PU5) РU5 is a hand-held PC (HPC) with integrated detection module
Detectors Scintillator, NaI(Tl) Ø63×63 mm (DU);
Geiger-Mueller counter tube (PU5)
Scintillator, NaI(Tl) Ø40×40 mm (DU);
Geiger-Mueller counter tube (PU5)
Energy range 20 keV – 7 MeV (DU)
60 keV – 3 MeV (PU5)
Detectable activity of 137Cs source, located at the distance of 20 cm in a time not longer than 2 s (30±6) kBq (50±10) kBq
Typical resolution at 662 keV (137Cs) 7.5%
Measurement range of ambient dose equivalent rate 0.03 – 150 µSv/h (DU)
1 µSv/h – 100 mSv/h (PU5)
0.03 – 300 µSv/h (DU)
1 µSv/h – 100 mSv/h (PU5)
Limits of tolerable intrinsic relative error ±20%
Typical sensitivity to 137Cs gamma radiation 2700 cps/(µSv·h-1) (DU) 870 cps/(µSv·h-1) (DU)
Energy dependence relative to 662 keV (137Cs) ±15% (50 keV to 7 MeV) (DU)
-25% to +35% (60 keV to 3 MeV) (PU5)
Response time for dose rate change from 0.1 to 1 µSv/h ≤2 s (DU)
Protection class IP54 (DU)
IP67 (PU5)
Overall dimensions, weight (assembled with handle) 355x190x170 mm, 2.65 kg 330x180x160 mm, 1.85 kg


Design and specifications are subject to change without notice.
For details please refer to the datasheet.


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