PHDS Co.
Application

Non-Destructive Assay

Quantify isotope activity in sealed containers including drums, B-25 boxes, and cargo containers using HPGe spectroscopy with ISOTAC geometry-corrected NDA calculations.

SourceTerm Viewer

Non-destructive assay of radioactive waste and nuclear materials requires both accurate isotope identification and calibrated activity quantification without opening or dissolving the sample. HPGe gamma-ray spectroscopy provides the spectral resolution to identify and separate isotope contributions in complex mixed-radionuclide containers.

ISOTAC NDA software computes geometry-corrected activities using 3D models of the container being measured. Standard containers including 55-gallon drums, B-25 boxes, and cargo containers are pre-defined in the ISOTAC library. Custom container geometries can be imported and filled with attenuating materials to match any measurement scenario.

The QuantiCart mobile NDA cart positions a Fulcrum or Fulcrum-40h HPGe detector at user-defined angles and heights from floor level to 45 inches, with onboard apertures for four geometries. Measurements recorded in the field on Android OMNI can be analyzed offline using WinOMNI and ISOTAC, producing assay reports with full uncertainty accounting.

Instruments for this application
Fulcrum
Fulcrum
Definitive isotope ID in a portable 8-lb package, no liquid nitrogen.
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Fulcrum-40h
Fulcrum-40h
40% relative efficiency in a portable package, over 3x the standard Fulcrum.
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Fulcrum-L
Fulcrum-L
A complete benchtop HPGe spectrometer with GMP-compliant analysis.
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QuantiCart-Scanner
QuantiCart
Turns a portable Fulcrum into a repeatable, shielded station for drum and container surveys.
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ISOTAC SourceTerm Viewer
ISOTAC NDA
Quantified isotope activities from 3D container models: drums, B-25 boxes, and custom geometries.
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WinOMNI Spectral View
WinOMNI
The Windows analysis platform for the Fulcrum line: isotope ID, quantification, uncertainty, and defensible reporting.
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Related reading
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
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
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
Third-Party Testing
Savannah River National Laboratory: Gamma-Ray Imaging Assay of 235-F PuFF East Cell Line Cells 3-5 (2017)
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.
External report
Open report
Next steps

Need HPGe-based NDA for waste or materials characterization?

Our application engineers can confirm detector performance for your specific isotopes, walk through measurement geometry requirements, and recommend the right configuration.

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