AT6104DM, AT6104DM1 Spectrometers

Radioactive contamination control of water and bottom sediments at depths up to 500 meters with GPS-geotagging.


  • Monitoring of the instrument spatial position during measurement
  • Cable reel with a current feedthrough
  • Display of the controlled radionuclides concentration or gamma radiation dose rate distribution with geotagging
  • Expert mode for instrument spectrum analysis with automatic identification of sample radionuclide content
  • Expert “GARM” software for further data processing and analysis, and radiological mapping

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AT6104DM AT6104DM1
Scintillation detector NaI(Tl) Ø63×63 mm NaI(Tl) Ø63×160 mm
Energy range 70 keV – 3 MeV
Identified radionuclides

[Extended library (add 60Co, 24Na, 54Mn, etc.) available on request]

137Cs, 134Cs, 131I, 40K, 226Ra, 232Th
Measurement range of specific activity in water (4π geometry)

[Extended library (add 60Co, 54Mn, etc.) available on request]

3 – 1·106 Bq/kg [134Cs, 137Cs, 131I]

250 – 2·104 Bq/kg [40K]

1 – 1·106 Bq/kg [134Cs, 137Cs, 131I]

100 – 2·104 Bq/kg [40K]

Measurement range of specific activity in bottom sediments (2π geometry) 50 – 1·106 Bq/kg [134Cs,137Cs]

250 – 2·104 Bq/kg [40K]

Typical resolution at 662 keV (137Cs) 7.5% 8.5%
Measurement range of ambient dose equivalent rate 0.03 – 130 µSv/h 0.03 – 50 µSv/h
Limits of tolerable intrinsic relative error

±20% (for specific activity and dose rate measurement)

Typical sensitivity to 137Cs gamma radiation 2350 cps/(µSv·h-1) 5100 cps/(µSv·h-1)
Protection class of the detection device


(Withstands static hydraulic pressure up to 5 MPa for not less than 24 h)

Overall dimensions and weight of detection device Ø130×510 mm, 4.5 kg Ø130×633 mm, 6.5 kg

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


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