The GuardianTM Syclone is one of the most accurate handheld spectrometers available for the detection and identification of radioactive sources. Its lightweight, rugged design allows for operation in inclement weather and other harsh environmental conditions. The user-friendly system offers easy-to-navigate menus, a large backlit screen to view data in both numeric and graphic formats, and audio feedback for eyes-free operation.


  • Extensive isotope library for quick and accurate gamma source identification and neutron detection

  • Lightweight and rugged for use in harsh environments

  • Presents data in real time with easy-to-use menus and displays

  • Operator-friendly features including a large backlit display and four-position joystick

  • Audio feedback for eyes-free operation

Physical Specifications

  • Operating Configurations: Handheld monitor
    • Guardian Syclone G for gamma detection
    • Guardian Syclone GN for gamma and neutron detection
  • Number of Gamma Detectors: 2 detectors
  • Gamma Detector Material: NaI (Tl) sodium iodide and Geiger-Mueller
  • Number of Neutron Detectors: 1 detectors
  • Neutron Detector Material: LiZnS-PMMA
  • External Dimensions: 7.75 in L x 3.5 in W x 3 in D (197 mm L x 89 mm W x 76 mm D)
  • Weight: 3.7 lbs (1.7 kg)

Performance Specifications

  • Gamma Radiation Detection Meet: ANSI N42.34
  • Gamma False Alarm Rate: Less than 1 per hour


  • Inspection Speed: 7 ft/s (2.2 m/s) nominal
  • Ports: Micro USB

Environment / Safety

  • Temperature: -4 °F to 140 °F (-20 °C to 60 °C )
  • Humidity: 5 to 95% non-condensing
  • Environmental Protection: IP67