• The Fulcrum HPGe detector 7 lbs

    The new Fulcrum HPGe gamma-ray spectrometer offers excellent gamma-ray spectroscopy in the most portable form factor.

  • The New GeGI

    The most sophisticated gamma-ray detector in the world, now in a more compact, lightweight form factor, same great performance.

  • GeGI On Optional Auto Pan-Tilt Tripod with Pinhole and Auto Laser Range Finder

  • Real Time Identification

  • Quantitative Imaging

  • Standoff Location

  • Shape analysis

  • Standoff Nuclear Assay of Radiological Threats

    Standoff Nuclear Assay Radiological Threats From Safe Standoff Distances

Compact High Tech HPGe Detectors


Video of Fulcrum and GeGI HPGe Gamma-ray detectors

Please double-click the top of the video frame for a larger view.


Detect, Identify, Locate & Quantify Radioactive Materials

Welcome to PHDS

PHDS Co. develops and manufactures HPGe gamma-ray imaging detector systems.

  • Safe Standoff Detection, Identification and Assay
  • Radiological and Nuclear Defense
  • Nuclear Physics
  • Gamma-Ray Imaging
  • Positron Spectroscopy
  • Rare Particle Detection
  • Nuclear Medicine Imaging
  • Preclinical Molecular Imaging
  • Radiopharmaceuticals
  • Radiochemistry
  • Health Physics
  • Nuclear Power
  • Nuclear Materials Management
  • Nuclear Safeguards
  • Nuclear Spectroscopy
  • Environmental Monitoring
  • Isotope Identification and Location
  • Compton Imaging
  • Decommissioning
  • Decontamination 
  • Demolition



  • GeGI CBRNE Demonstration read more…
  • GeGI Performs at IAEA Workshop read more…
  • GeGI Used for Standoff Visual Detection in Tower of Containers read more…
  • GeGI demonstrated live at WM2015 read more…
  • GeGI introduced at IEEE in Seattle read more…
  • GeGI differentiates and locates sealed containers of radioactive waste at... read more…
  • Alameda Maritime Interdiction Exercise read more…
  • PHDS Co. introduces GeGI gamma-ray imaging to INMM in Atlanta July 2014 read more…
  • Hundreds of live demonstrations of GeGI at PHDS Co. first exhibit at HPS July... read more…
  • GeGI for Decontamination and Decommissioning read more…

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or call 865 202 6253