Pedestrian Radiation Monitors (based on AT2327 Alarm Dosimeter)

Detection of gamma and neutron 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
  • High reliability and self-check function
  • Backup power source


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Pedestrian Radiation Monitors
False alarm rate ≤1 for 8 h of continuous operation
PC interface RS 485
Continuous battery operation time ≥6 h
Protection class IР65
Overall dimensions, weight depending on configuration


Gamma radiation detection unit BDKG-19 BDKG-35 BDRM-05
Scintillation detector NaI(Tl) Ø63×160 mm Plastic Ø70х150 mm Plastic 1000х100х50 mm
Energy range 50 keV – 3 MeV 20 keV – 3 MeV 50 keV – 3 MeV
Typical sensitivity, cps/(µSv·h-1) 32500 [241Am]

4900 [137Cs]

2800 [60Co]

10000 [241Am]

3600 [137Cs]

2300 [60Co]

60000 [241Am]

31500 [137Cs]

16500 [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 0.01 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)

One detection unit 430 kBq [241Am]

220 kBq [137Cs]

100 kBq [60Co]

1180 kBq [241Am]

230 kBq [137Cs]

100 kBq [60Co]

800 kBq [241Am]

110 kBq [137Cs]

60 kBq [60Co]

Two detection units 320 kBq [241Am]

160 kBq [137Cs]

70 kBq [60Co]

860 kBq [241Am]

170 kBq [137Cs]

70 kBq [60Co]

580 kBq [241Am]

80 kBq [137Cs]

40 kBq [60Co]


Neutron radiation detection unit BDKN-01 BDKN-05
Detector He-3 proportional counter in polyethylene moderator Two He-3 proportional counters in polyethylene moderator
Energy range 0.025 eV – 14 MeV 0.025 eV – 14 MeV
Typical sensitivity to source radiation at the distance of 1 m, cps/(neutron·s-1·cm-2) 1.3 [252Cf] 20 [252Cf]
Source detection threshold at 1 m height

(Distance to source 1 m, source travel speed 5 km/h, probability of source detection 80% under confidence level Р=0.95)

One detection unit 2.2·105 neutron/s [252Cf] 2.3·104 neutron/s [252Cf]
Two detection units 1.6·104 neutron/s [252Cf]

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


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