Current Fulcrum-40h firmware makes energy resolution independent of count rate and matches the Detective-X pile-up correction to 30 kcps, addressing the open items from Sandia's 2026 NEST HPGe reassessment.

Sandia's NNSA-funded head-to-head found the Fulcrum-40h averages at least 20% higher gamma efficiency below 300 keV than the Detective-X, with comparable energy resolution.

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.

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.

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.

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.

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.

SRNL used the GeGI in Compton and pinhole modes to map Pu-238 distribution in Cells 3-5 of the 235-F East Cell Line, refining a prior holdup model with spatial source data.

In a live CBRNE exercise the GeGI detected, located, and quantified Cs-137, Pu-239, depleted uranium, and HEU across six targets, including a real-time estimate of about 85 grams of U-235.

This DOE Phase I project developed spectral and spatial algorithms that improved pinhole and Compton imaging for count-starved SNM assay, producing a quantitative spectroscopic imaging capability.

At ORNL's REDC, the GeGI tracked an Ac-225 and Ra-225 radiochemical separation in real time, mapping the parent, product, and decay daughters by gamma energy on the collection carousel.

This PHDS paper argues that compact high-resolution gamma imagers let CBRNE teams map source location, identity, and quantity from safe standoff, replacing semi-random detector search.

This LLNL overview introduces the GeGI HPGe gamma imager and its capabilities ahead of the 2015 IAEA Technology Evaluation Workshop on gamma imaging for safeguards.

Using a shielded HPGe detector and the GeGI for source mapping, SRNL measured 0.90 plus or minus 0.058 grams of Pu-238 holdup in the 235-F West Cell Line, more precise than prior assays.

This LLNL report assesses GeGI performance in a maritime interdiction operation scenario, evaluating the portable HPGe gamma imager for shipboard search and localization of nuclear material.

This LLNL and PHDS paper presents the GeGI, the first portable germanium gamma imager with a 4-pi field of view, with safeguards measurements at Paducah and the Savannah River Site.