Key Features
- Gamma image always registered to a live optical view
- 32-element double-sided strip HPGe detector
- Millimeter-level source localization with pinhole or coded aperture
Application Areas
Emergency Response
Definitive isotope ID at standoff, in seconds
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Radiopharmaceutical
Radiopharmaceutical production QA and quantified radionuclidic purity performed with GMP and 21 CFR Part 11 compliant software
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Safeguards
Identify and quantify special nuclear materials at declared and undeclared facilities using HPGe isotope ID and quantitative assay without destructive sampling.
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Interface
GeGI source ID and localization UI
GeGI Pinhole imaging of check sources with mm-level precision
Downloads
Full Specifications
Detector
| Detector Type | High-Purity Germanium (HPGe) |
|---|---|
| Crystal Dimensions | 90mm x 11mm |
| Detector Structure | 32-element Double-Sided Strip Detector |
Physical
| Weight | 15 lbsincludes tablet and 2 batteries |
|---|---|
| Dimensions | ~10.5" x 8.0" x 5.5"26 cm x 20 cm x 14 cm |
Imaging Capabilities
| Compton Imaging | Gamma energies > 120 keVincluding U-235 at 186 keV |
|---|---|
| Pinhole Imaging | 1mm, 3mm, and 5mm pinhole apertures |
| Coded Aperture Imaging | Rank-19 MURA with 2.5mm elementsmanual or automatic rotation available |
Cooling
| Cooler type | Long-life Stirling Cycle |
|---|---|
| Cool-down time | ~4 hrroom temperature to operating temperature |
Power
| Power Supply | 100-240 VAC, 50-60 Hz |
|---|---|
| Dual Internal Batteries | ~3 hrhot-swappable |
| BB2590 (mil-spec) Battery | ~4.5 hrvia external connector |
Electronics & Software
| User Interface | ImagerPro software on integrated tablet or Windows PC |
|---|---|
| Data Output Format | ANSI N42.42 |
| Wireless | Yes |
| API Control | Yes |
Technical Notes
Third-Party Testing
IAEA Technology Demonstration Workshop on Gamma Imaging: Final Report (2015)
The IAEA's 2015 gamma imaging workshop evaluated nine imaging systems for safeguards. The GeGI participated as a Compton and pinhole HPGe imager across eight source and nuclear material experiments.
External report
Open report
Third-Party Testing
NNSA Defense Nuclear Nonproliferation Sentinel: GeGI Development and Capability (2018)
NNSA's DNN Sentinel features the PHDS GeGI as a commercial success of the agency's High Rate Germanium Detector program, crediting NNSA-funded electronics for the fielded imager.
External report
Open report
Third-Party Testing
Spatially-Resolved HPGe Gamma-Ray Spectroscopy of Swipe Samples (PNNL, 2017)
PNNL characterized a high-rate GeGI-s for nuclear forensics, using its HPGe pixelization to generate isotope-specific spatial maps of swipe samples placed directly on the detector face.
External report
Open report
Third-Party Testing
Sellafield Decommissioning Capability Development: Gamma Imaging Evaluation Selects GeGI (2016-17)
After demonstrating nine gamma imaging systems, Sellafield selected the GeGI as one of two systems purchased, citing its suitability for fast results in low dose rate areas.
External report
Open report
Third-Party Testing
Savannah River National Laboratory: Gamma-Ray Imaging and Holdup Assay of 235-F PuFF Cells 1 and 2 (2017)
SRNL used the GeGI to image and quantify Pu-238 holdup in Cells 1 and 2 of the 235-F Plutonium Fuel Form Facility, supporting decommissioning planning at the Savannah River Site.
External report
Open report