Monitor de Actividad Gamma AT1320A

AT1320AWith expanded nuclide library

Highly sensitive selective wide-range spectrometric scintillation gamma activity monitor is intended for measuring volumetric (specific) radionuclide activity in 131I, 134Cs, 137Cs, 40K samples with 1 litre Marinelli beaker and 0.5 and 0.1 litre flat-type containers.






Operating principle
Gamma activity monitor operating principle is based on the detection unit pulse-height distribution analysis.

Energy distribution parameters are processed in energy windows with the help of matrix method.

Matrix method allows measurement of volumetric (specific) activity for monitored radionuclides based on energy windows count rate.
Measurement results are displayed on Information processing unit screen in real-time.

Gamma radioactivity monitor has a PC-detecting unit connection option.

Application software replaces Information processing unit and is used for controlling radioactivity monitor modes, measurement data display, spectra processing, electronic history logging and recording of measurement results.



  • Radiation protective measures in case of nuclear disasters
  • Potable water monitoring
  • Foodstuffs monitoring
  • Agricultural products monitoring



  • Spectrometric smart probe
  • Internal continuous automatic LED stabilisation of gamma counter energy scale, calibration integrity monitoring and automatic calibration with integrated KCl sample
  • Recording and storing in memory up to 300 measured spectra
  • Automatic background substraction
  • Sample activity measurement for materials with wide density range
  • Can be used both in stationary and mobile radiation monitoring laboratories
  • Methodological and metrological support of measurements


AT1320C Gamma Activity Monitor meets
International standard requirements: IEC 61563:2001
Safety standard requirements: IEC 61010-1:1990
EMC requirements: EN 55022:1998+A1:2000+A2:2003, EN 55024:1998+A1:2001+A2:2003
IEC 61000-4-2:2001, IEC 61000-4-3:2008, IEC 61000-4-4:2004, IEC 61000-4-11:2004


Detector Scintillation NaI(Tl) ø63x63 mm
Measurement range for volume (specific) activity  
   measurement geometry - Marinelli beaker, 1 litre  
     131I 3 - 4·105 Bq/l (Bq/kg)
     134Cs 3 - 1·105 Bq/l (Bq/kg)
     137Cs 3,7 - 1·105 Bq/l (Bq/kg)
     40K 50 - 2·104 Bq/l (Bq/kg)
   measurement geometry - Flat-type container, 0.5 litre  
     131I 20 - 4·105 Bq/l (Bq/kg)
     134Cs 20 - 4·105 Bq/l (Bq/kg)
     137Cs 20 - 4·105 Bq/l (Bq/kg)
     40K 200 - 2·104 Bq/l (Bq/kg)
   measurement geometry – “Denta” container, 0.1 litre    
     131I 50 - 1·106 Bq/l (Bq/kg)
     134Cs 50 - 1·106 Bq/l (Bq/kg)
     137Cs 50 - 1·106 Bq/l (Bq/kg)
     40K 500 - 2·104 Bq/l (Bq/kg)
Basic fractional error of volume (specific) activity measurement ±20% max.
Measured sample density range 0.1 g/sm3 - 3 g/sm3
Minimum measured activity for 1-hour measurement with statistical error ±50% (P=0.95)  
   measurement geometry - Marinelli beaker, 1 litre  
     131 4 Bq/l (Bq/kg)
     134Cs 4 Bq/l (Bq/kg)
     137Cs 5.7 Bq/l (Bq/kg)
     40K 78 Bq/l (Bq/kg)
   measurement geometry - Flat-type container, 0.5 litre  
     131 20 Bq/l (Bq/kg)
     134Cs 20 Bq/l (Bq/kg)
     137Cs 20 Bq/l (Bq/kg)
     40K 260 Bq/l (Bq/kg)
     measurement geometry – “Denta” container, 0.1 litre    
     131I 50 Bq/l (Bq/kg)
     134Cs 50 Bq/l (Bq/kg)
     137Cs 52 Bq/l (Bq/kg)
     40K 690 Bq/l (Bq/kg)
Energy range of measured gamma radiation 50 keV- 3000 keV
Number of ADC channels 512 / 1024
Integral nonlinearity ±1% max.
Intrinsic background for 137Cs window <2 cps
Operation mode setup time 10 min
Continuous work time ≥24 h
Measurement instability during continuous service ≤3%
Operating temperature range 0°C to +40°C
Relative humidity with air temperature ≤30oC without condensation up to 75%
Overall dimensions, weight  
     Detection unit ø97x350 mm, 2 kg
     Processing unit 200x106x35 mm, 0.62 kg
     Protection unit ø600x700 mm, 125 kg
     AC adapter 100x85x60 mm, 1 kg


Servicios a la Industria Nuclear y Convencional, S. A. de C. V.
Cumbres de Acultzingo #26 Int. 104
Col. Narvarte Oriente, Del. Benito Juárez, C. P. 03020, Ciudad de México
Teléfono: (55) 5523 5400     E-mail: