AT6101DR Spectrometer

AT6101DR Multifunction portable spectrometer is designed for radionuclide identification, 40K, 226Ra, 232Th natural radionuclide content measurement, 134Cs and 137Cs man-made radionuclide surface activity in situ measurement in soils and subsoils, as well as specific 137Cs, 134Cs and 131I radionuclide activity measurement in water, foodstuffs, agricultural and forestry products without preliminary sampling.

Spectrometer may also be used for measurement of ambient gamma radiation dose equivalent rate on objects of radiation monitoring.
Internal GPS-receiver provides measurement data geo-referencing function.


  • Radioecological monitoring of environment
  • Radiation monitoring during decontamination operations
  • Geological survey
  • Radioactive waste monitoring
  • Construction material and products radiation monitoring of natural radionuclide content
  • Dosimetry survey of ground and facilities, radioactive mapping


  • Smart probe in sealed container
  • Wireless connection between smart probe and hand-held PC via Bluetooth-adapter at up to 10 m distance
  • Automatic calculation of monitored 137Cs and 134Cs radionuclide depth in soil
  • Measurement geometry: 2π and 4π
  • Instant detection of near background dose rate level increase
  • Automatic LED stabilisation and measurement path temperature compensation
  • Setting up procedure and parameter check using check sample that contains KCl salt with naturally occurring radionuclide 40K
  • Expert mode for detailed instrument spectrum analysis with automatic sample radionuclide content identification
  • Records and stores in non-volatile memory up to 140,000 measured instrument spectra
  • All measurement data can be transferred to PC for further detailed processing by dedicated GARM software
  • Display of measurement results with GPS-referencing (for Tablet-PC version)
  • Measurement result display in: Bq/kg (134Cs, 137Cs, 131I, 40K, 226Ra, 232Th), ppm (226Ra, 232Th), % (40K)


Detecting unit in a temperature-and-shock-resistant dust-proof and moistureproof container detects gamma radiation of monitored radionuclides.

Spectrometric data from smart probe is sent via Bluetooth-adapter to display on hand-held PC (Tablet PC) screen.

Instrumental spectra processing algorithm in hand-held PC (Tablet PC) software is capable to display radioisotope composition data as specific or surface activity of certain radionuclides or their concentration, specific effective activity of natural radionuclides.

Version with Tablet PC can display measurement results with GPS-referencing.

Ambient gamma-radiation dose equivalent rate value in inspection point is determined by instrument spectrum analysis with “spectrum-dose” operational function.

Radioactive anomalies are searched in integral count rate measurement mode.


  Gamma radiation instrument spectrum
User-selectable radionuclide activity
 Ambient dose equivalent rate and integral cou
Gamma radiation detector

Scintillator NaI(Tl) Ø63x63 mm

Energy range

50 keV...3 MeV

Activity measurement range


Geometry: 2π


     Surface activity of 134Cs and 137Cs

4 – 3700 kBq/m2 (0.1 – 100 Ci/km2)

     Specific activity of 134Cs and 137Cs by in situ method
     in 15-cm soil layer

50 – 106 Bq/kg

     Specific effective activity of 40K, 226Ra, 232Th

100 – 104 Bq/kg

Geometry: 4π


     Specific activity of 134Cs and 137Cs

50 – 106 Bq/kg

     Specific activity of 131I

30 – 106 Bq/kg

     Specific effective activity of 40K, 226Ra, 232Th

50 – 104 Bq/kg

Intrinsic relative error of monitored radionuclide concentration measurement

±20% max.

Typical resolution at 662 keV (137Cs)


Maximum input statistical load

≥5·104 s-1

Number of ADC channels


Ambient gamma radiation dose equivalent rate measuring range

0.01...130 µSv/h

Sensitivity to gamma radiation



11600 cps/µSv·h-1


2200 cps/µSv·h-1


1200 cps/µSv·h-1

Intrinsic relative error of ambient gamma radiation dose equivalent rate measurement

±20% max.

Operation mode set up time

1 min

Integral nonlinearity

±1% max.

Continuous work time in normal conditions

≥9 h

Measurement instability during continuous service


Operating temperature range


Relative humidity with air temperature ≤35°C without condensation


Protection class


PC Interface


Overall dimensions


     Hand-held PC

100x250x60 mm

     Detection unit

Ø130x500 mm



     Hand-held PC

0.5 kg

     Detection unit

4.5 kg

AT6101DR Spectrometer  meets International standard requirements: IEC 60529:2001 
Safety standard requirements: IEC 61010-1:1990
EMC requirements: EN 55022:1998+А1:2000+А2:2003, 
EN 55024:1998+A1:2001+A2:2003, IEC 61000-4-2:2001, IEC 61000-4-3:2008

Design and specifications are subject to change without notice



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