Description
Application
Radiation Portal Monitors (RPM) are permanently installed radiation detection systems designed for automated screening of pedestrians, vehicles and trains passing through the detection zone of RPM for presence of gamma and neutron radiation. The RPM alerts the security office and front line officer about the presence of radioactive and nuclear material and provides additional alarm associated information: type of alarm (gamma, neutron or both), relative amplitude of the alarm, etc.
COMPLETE SET
- Pedestrian radiation portal monitors
- Transport radiation portal monitors
Radiation Portal Monitor consists of:
- Vertical pillars
- Gamma detectors
- Neutron detectors
- Occupancy sensor
- On-pillar alarm indicator
- Hermetic pillars enclosure
- Local alarm station
- Remote console for alarm indication
- UPS
SPECIFICATION
Parameter | Value (option 1) | Value (option 2) |
---|---|---|
Gamma detectors | Plastic scintillation detectors covered with 8 mm back and side lead shield | HPGe semiconductor detectors with 5 cm back and side lead shield |
Detectors dimensions, mm | 1050 x 200 x 50 | Ø80 x 40 |
Number of gamma detectors per pillar | 4 | 4 |
Neutron detectors | He-3 proportional counters | He-3 proportional counters |
He-3 tube dimensions (dia. x length) | Ø30 mm x 1000 mm | Ø30 mm x 1000 mm |
He-3 gas pressure | 4 atmospheres | 4 atmospheres |
Number of 3He tubes per pillar | 4 | 4 |
Number of pillars | 2 | 2 |
Detection zone | Vertical: 0 to 3.8 m. Horizontal: 6.2 m. | Vertical: 0 to 3.8 m. Horizontal: 6.2 m. |
Vehicle speed | 10 km/h | 10 km/h |
Dynamic sensitivity to gamma, thresholds at 95% confidence level |
235 U – 250 gr. 133 Ba – 270 kBq 137Cs – 300 kBq 60Co – 160 kBq |
57Co – 180 kBq. 133Ba – 300 kBq 137Cs – 300 kBq 60Co – 240 kBq |
Dynamic sensitivity to neutrons | 252 Cf – 80 kBq | 252Cf – 80 kBq |
False alarm rate | 1:1000 passages | 1:1000 passages |
Maximum power consumption | 650 Watts | 2700 Watts |
Main voltage and tolerance | 220 V +/- 10%; 50 Hz +/- 10% | 220 V +/- 10%; 50 Hz +/- 10% |
Temperature range | – 50 … + 50 °C | – 50 … + 50 °C |
Relative humidity | 93% at +40 °C with condensation | 93% at +40 °C with condensation |
Mean time to repair (MTTR) | MTTR < 2 weeks, availability 99% | MTTR < 2 weeks, availability 99% |
Expected lifetime | 10 years | 10 years |
Mean time between failures | 2 years | 2 years |