AT920B, AT920P Pedestrian Radiation Monitors

Detection of gamma radiation sources in a stream of people crossing borders of controlled facilities.


  • Rapid accommodation to changes in radiation background
  • Sound and light alarm
  • Multiple pedestrian radiation monitors (up to 32) can be joined into a network controlled by application software running on a PC
  • Mobility and rapid deployment for passage control
  • High reliability and self-check function
  • Backup power source


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AT920B AT920P
Scintillation detector NaI(Tl) Ø63×160 mm Plastic Ø70×150 mm
Registered radiation Gamma radiation Gamma radiation
Energy range 50 keV – 3 MeV 20 keV – 3 MeV
Typical sensitivity to gamma radiation cps/(µSv·h-1)
30650 (241Am)
4900 (137Cs)
3140 (60Co)
10000 (241Am)
3200 (137Cs)
1600 (60Co)
Minimal detectable gamma radiation dose rate level above background value 0.1 µSv/h in a period not longer than 2 s 0.03 µSv/h 0.04 µSv/h
Detection threshold for unshielded source at 1 m height under natural radiation background conditions not more  than 0.1 µSv/h (Distance to source 1 m, source travel speed 5 km/h, probability of source detection 80 % under confidence level Р=0.95) 1 MBq (241Am)
320 kBq (137Cs)
130 kBq (60Co)
2.3 MBq (241Am)
370 kBq (137Cs)
190 kBq (60Co)
False alarm rate ≤1 for 8 h of continuous operation
PC interface RS485
Continuous battery operation time ≥6 h
Protection class IP54
Dimensions Ø350×1220 mm
Weight 14.5 kg 13.5 kg

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


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