Vehicle Radiation Monitors (based on AT2327 Alarm Dosimeter)

Detection of gamma and neutron radiation sources in vehicles crossing access control points.

 

  • Screening of the rear wall of the gamma radiation detection unit by lead plates
  • Automatic adjustment of set threshold levels according to changes in natural radiation background
  • High reliability and self-check function
  • Backup power source
  • Automatic data logging

 

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Specification

Vehicle Radiation Monitors
Passage width / height 6 m / 4 m
Detection time per one vehicle ≤20 s
False alarm rate ≤1 per 1000 crossings
Continuous battery operation time ≥6 h
Protection class IP65
Overall dimensions, weight depending on configuration

 

Gamma radiation detection unit (DU) BDKG-19 BDKG-35 BDRM-05
Scintillation detector NaI(Tl) Ø63×160 mm Plastic Ø70×150 mm Plastic 1000x 100×50 mm
Energy range 50 keV – 3 MeV 20 keV – 3 MeV 50 keV – 3 MeV
Typical sensitivity to  gamma radiation, cps/(µSv·h-1) 4430 [137Cs] 3200 [137Cs] 31500 [137Cs]
Detection threshold for unshielded source under natural radiation background conditions not more than 0.1 µSv/h (Probability of source detection 80 % under confidence level Р=0.95)
For motor vehicles. Passage: Width – 6 m, height – 4 m. Travel speed is 10 km/h
BDKG-19 BDKG-35 BDRM-05
1 DU at each side of passage 1.3 MBq [137Cs] 1.6 MBq [137Cs] 0.34 MBq [137Cs]
2 DU at each side of passage 0.9 MBq [137Cs] 1.1 MBq [137Cs] 0.24 MBq [137Cs]
4 DU at each side of passage 0.19 MBq [137Cs]
For railway vehicles. Passage: Width – 6 m, height – 4 m. Travel speed is 25 km/h
BDKG-19 BDKG-35 BDRM-05
1 DU at each side of passage 0.49 MBq [137Cs]
2 DU at each side of passage 0.34 MBq [137Cs]
4 DU at each side of passage 0.26 MBq [137Cs]

 

Neutron radiation detection unit (DU) BDKN-05
Detector: 3He proportional counter in polyethylene moderator Two 3He counters
Energy range 0.025 eV – 14 MeV
Typical sensitivity to neutron radiation at the distance of 1 m 20 cps/(neutron·s-1·cm-2) [252Cf]
Source detection threshold (Probability of source detection 90% (50%) under confidence level Р=0.95)
For motor vehicles. Passage: Width – 6 m, height – 4 m. Travel speed is 10 km/h
Probability is 90% Probability is 50%
1 DU at each side of passage 6.5·104 neutron∙s1 [252Cf] 4.2·104 neutron∙s1 [252Cf]
2 DU at each side of passage 4.3·104 neutron∙s1 [252Cf] 2.9·104 neutron∙s1 [252Cf]
4 DU at each side of passage 3.0·104 neutron∙s1 [252Cf] 2.2·104 neutron∙s1 [252Cf]
For railway vehicles. Passage: Width – 6 m, height – 4 m. Travel speed is 25 km/h
Probability is 90% Probability is 50%
1 DU at each side of passage
2 DU at each side of passage
4 DU at each side of passage 4.0·104 neutron∙s1 [252Cf] 2.9·104 neutron∙s1 [252Cf]

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

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