The Guardian™ 501 family of handheld Radionuclide Identification Devices (RIDs) excels at detecting gamma, beta, neutron, and cosmic radiation emitted by both natural and man-made sources. This ultra-compact, rugged, and sensitive Radionuclide Identification Device (RID) provides superior usability by offering a wider energy range, higher throughput, and better stability in a handheld.

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  • Ultra-compact and rugged

  • Intuitive and user-friendly operation

  • Built-in web interface for easy reach-back

  • Wide range of high resolution gamma and neutron detection

  • Replay tool aids detector optimization by using previously collected dataset

Physical Specifications

Operating Configuration: Handheld monitor

  • Detectors (by model):
    • Guardian 501 BGO
      • Gamma and thermal neutron (native)
      • Detector Material: Bi4Ge3O12 (Gd2O3)
    • Guardian 501 NAI
      • Gamma
      • Detector Material: NaI(Tl)
    • Guardian 501 NAICN
      • Gamma and fast and thermal neutron
      • Detector Material: NaI(Tl) (Capture Neutrons)
    • Guardian 501 CLLBC
      • Gamma and thermal neutron (native) with high resolution
      • Detector Material: Cs2LiLa(Br,Cl)6:Ce
    • Guardian 501 LABR
      • Gamma and optional neutron with the highest resolution
      • Detector Material: LaBr3(Ce,Sr)
  • Dimension (L x H x W): 235 mm x 88 mm x 92 mm (9.3 in x 3.5 in x 3.6 in)
  • Weight: 1,200 to 1,350 g (2.65 to 3 lbs.) depending on detector type

Performance Specifications

  • Nuclide library includes more than 70 nuclides, exceeding IEC 62327, ANSI N42.34

Environment / Safety

  • Operating Temperature: -20 °C to 50 °C (-4 °F to 122 °F)