The Guardian™ Patriot backpack is a highly sensitive radiation detection system that can detect and identify a wide range of radioactive material, including medical isotopes, industrial isotopes, special nuclear materials (SNM), and naturally occurring radioactive materials (NORM). The Guardian Patriot can be deployed as a backpack worn by the operator or placed in a vehicle for greater area coverage. The backpack can communicate wirelessly, allowing mission-critical data to be monitored by a remote command center or reach-back facility.


  • Spectroscopic detection provides exceptional nuclide identification

  • Mapping and data logging with GPS coordinates

  • Lightweight, rugged, and water resistant

  • Works with Android and iOS devices

Physical Specifications

  • Operating Configurations: Backpack monitor
    • Guardian Patriot G for gamma detection
    • Guardian Patriot GN for gamma and neutron detection
  • Number of Gamma Detectors: 2 detectors
  • Gamma Detector Material: NaI(Tl) sodium iodide
  • Number of Neutron Detectors: 1 detector
  • Neutron Detector Material: LiZnS-PMMA
  • Backpack External Dimensions: 23 in L x 13 in W x 6 in D (58 cm L x 33 cm W x 16 cm D)
  • Backpack Weight:
    • Gamma backpack: 7 lbs (3.2 kg)
    • Gamma-Neutron backpack: 19.4 lbs (8.8 kg)

Performance Specifications

  • Gamma Radiation Detection: Meets ANSI N42.43
  • Neutron Radiation Detection: Meets ANSI N42.53
  • Gamma False Alarm Rate: Less than 1 per hour
  • Neutron False Alarm Rate: Less than 1 per hour


  • Inspection Speed: 7 ft/s (2.2 m/s) nominal
  • Communication: Ethernet, USB, Bluetooth

Environment / Safety

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