The versatile Guardian VM1000 Series detects illicit radionuclides concealed in conveyances ranging from passenger vehicles to tractor trailer trucks and trains. It is designed to operate as a stand-alone radiation portal monitor (RPM) or to integrate with an X-ray inspection system. Its modular design simplifies routine maintenance. State of Health monitoring optimizes system performance. Customizable detector sensitivity levels support exceptional NORM discrimination, minimizing nuisance alarms and the need for time-consuming manual inspections.


  • Drive-through RPM that screens a diverse range of vehicles from automobiles to cargo trucks and trains

  • Exceptional gamma and neutron sensitivity

  • Adjustable sensitivity settings that minimize nuisance alarms

  • Backwards compatible with systems running Raven software

  • Remote oversight for centralized monitoring

Physical Specifications

  • Operating Configurations: Drive-through radiation portal monitor
  • Pillars: Primary and auxiliary
  • Number of panels: 4 (2 per pillar, stacked)
  • Gamma Detection Material: Polyvinyltoluene (PVT) plastic scintillator
  • Number of Gamma Detectors: 4 (1 per panel)
  • Neutron Detector Material: LiZnS (Ag)
  • Number of Neutron Detectors: 8 (2 per panel)
  • External Panel Dimensions: 80 in H x 26 in W x 7.3 in D (203 cm H x 66 cm W x 18.4 cm D)
  • Panel Weight: 710 lbs (322 kg) (per panel)

Performance Specifications

  • Nuisance Alarm Rate: Less than 1 in 10,000 passages (typical)


  • Inspection Speed: 5 mph (8 km/h) nominal
  • Ports: RS232, Ethernet

Environmental / Safety

  • Temperature: -4 °F to 140 °F (-20 °C to 60 °C)
  • Humidity: 5 to 95% non-condensing
  • Environmental Protection: IP65