Radiation Portal Monitors with HPGe spectrometric channel

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

Two types of RPM are available depending on their purpose and packaging:
  • 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

DESCRIPTION

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. 

RPM software functionality:
 

  • Visual and audible indication of alarm
  • Automated adjustment of the gamma-ray and neutron alarm thresholds without interfering with ongoing operation
  • Provision of horizontal scanning profiles for neutrons and gamma radiation in case of alarm for each detector
  • Interactive operator window with identified radionuclides list and corresponding count rates vs. time (semiconductor detector option)
  • Documentation of the radiation alarm, including entering the results of secondary screening assessment
  • Monitoring of the status of health of all subsystems (gamma and neutron detectors, occupancy and tamper sensors, on-pillar alarm indicators, temperature inside the housings, climate control, remote link and power supply)
  • Recording, storing and processing of information
  • Data retrieval from archive and review
  • Log alarms
  • Indication of count rate for individual detector in RPM
  • Support LAN and TCP/IP connection
  • Password protected setup of critical system parameters
  • Automatic shut down and start up after loss of power

SPECIFICATION

ParameterValue (option 1)Value (option 2)
Gamma detectorsPlastic scintillation detectors covered with 8 mm back and side lead shieldHPGe semiconductor detectors with 5 cm back and side lead shield
Detectors dimensions, mm1050 x 200 x 50Ø80 x 40
Number of gamma detectors per pillar44
Neutron detectorsHe-3 proportional countersHe-3 proportional counters
He-3 tube dimensions (dia. x length)Ø30 mm x 1000 mmØ30 mm x 1000 mm
He-3 gas pressure4 atmospheres4 atmospheres
Number of 3He tubes per pillar 44
Number of pillars22
Detection zoneVertical: 0 to 3.8 m. Horizontal: 6.2 m.Vertical: 0 to 3.8 m. Horizontal: 6.2 m.
Vehicle speed10 km/h10 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 neutrons252 Cf – 80 kBq252Cf – 80 kBq
False alarm rate1:1000 passages1:1000 passages
Maximum power consumption 650 Watts2700 Watts
Main voltage and tolerance220 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 condensation93% at +40 °C with condensation
Mean time to repair (MTTR) MTTR < 2 weeks, availability 99%MTTR < 2 weeks, availability 99%
Expected lifetime10 years10 years
Mean time between failures 2 years2 years

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