The Guardian MD134 mobile radiation detection system, mounted on customer-specified chassis, automatically scans vehicle and cargo containers for the presence of radioactive sources. Designed for operational flexibility, the Guardian MD134 can be quickly and easily deployed for use in stationary mode as a temporary checkpoint or in drive-by mode, scanning as it passes the target or through a specified geographic region.


  • Gamma and neutron radiation detection

  • Programmable detection parameters, offering customization to meet the needs of the customer’s specific application

  • Remote monitoring, ensuring personnel safety and providing remote oversight

  • Enhanced sensitivity, allowing for multiple lane road spacing when used at checkpoints

Physical Specifications

  • Operating Configuration: Vehicle-mounted monitor
  • Number of Gamma Detectors: 2
  • Gamma Detector Material: Organic plastic scintillator
  • Number of Neutron Detectors: 4 standard; 8 highly sensitive
  • Neutron Detector Material: He-3 tube
  • Dimensions: 68 in H x 61 in W x 21.5 in D (172 cm H x 155 cm W x 55 cm D) per skid
  • Weight: 850 lbs (386 kg) per skid

Performance Specifications

  • Special Nuclear Materials (SNM) Detection: 1,000 g of U-238 (HEU) or 10 g of Pu-239 in 20 µR per hour background passage speed of 5 mph (8km/h); distance of 39 in (1 m)
  • Neutron Detection: less than 200 g of plutonium in a shielded container that reduces the gamma flux to 1% of the unshielded gamma flux


  • Ports: Serial, Ethernet

Environment / Safety

  • Temperature: -4 °F to 122 °F (-20 °C to 50 °C)
  • Environmental Protection: Designed for use in sheltered areas