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A tomographic spatial-unfolding method for Compton gamma imaging measurements.

N J Murtha1, P R B Saull2, L E Sinclair3

  • 1Department of Physics, Carleton University, Ottawa, Ontario, Canada; Canadian Hazards Information Service, Natural Resources Canada, Ottawa, Ontario, Canada; Ionizing Radiation Standards, Metrology Research Centre, National Research Council, Canada; Department of Medical Physics, Tom Baker Cancer Centre, Calgary, Alberta, Canada.

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Summary
This summary is machine-generated.

A new spatial-unfolding technique reconstructs radiation activity in exclusion zones using gamma imager data. This method accurately locates sources and estimates activity, crucial for radiological safety and security applications.

Keywords:
Compton gamma imagingData unfoldingDetector responseRadiation detectionRadiological securityTomography

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Area of Science:

  • Nuclear Physics
  • Radiation Detection and Imaging
  • Applied Mathematics

Background:

  • Reconstructing radiation activity within inaccessible zones is critical for safety and security.
  • Compton gamma imagers provide external measurements for remote assessment.
  • Existing methods may struggle with complex source distributions or detector limitations.

Purpose of the Study:

  • Introduce and validate an advanced spatial-unfolding technique.
  • Assess the method's accuracy in reconstructing activity distributions from external measurements.
  • Demonstrate applicability in radiological/nuclear safety and security scenarios.

Main Methods:

  • Developed a spatial-unfolding algorithm for Compton gamma imager data.
  • Validated the technique using Monte Carlo simulations with a Cs-137 point source.
  • Performed experimental measurements with a Silicon Compton Telescope for Safety and Security (SCoTSS) gamma imager.

Main Results:

  • The technique accurately reconstructed total activity in synthetic data, even with larger basis elements than the source.
  • Experimental data showed reliable source localization but a potential underestimation of activity by up to 17%.
  • Reconstruction accuracy is sufficient for practical security applications.

Conclusions:

  • The spatial-unfolding method is effective for mapping radiation activity in exclusion zones.
  • Potential underestimation in experimental data suggests areas for detector simulation refinement.
  • The technique offers broad applicability for radiological/nuclear security and safety challenges.