Guardian VM500 Series detects radioactive sources hidden within passenger vehicles; small trucks; and heavy, wide-load trucks at border crossings, ports, airports, critical infrastructure, and nuclear facilities. It offers State of Health monitoring to ensure that the radiation portal monitor (RPM) is operating at peak performance. Its industry leading software allows for customization of screens and settings, optimizing personnel and system performance. Detector sensitivity levels are adjusted based on the needs of the site, providing exceptional NORM discrimination which minimizes nuisance alarms and the need for time-consuming manual inspections.


  • Drive-through radiation portal monitors for passenger vehicles and small trucks

  • Superior gamma and neutron sensitivity

  • Automatic inspection operation

  • 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: 2 (1 per pillar)
  • Gamma Detection Material: Polyvinyltoluene (PVT) plastic scintillator
  • Number of Gamma Detectors: 2 (1 per panel)
  • Neutron Detector Material: LiZnS (Ag)
  • Number of Neutron Detectors: 4 (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