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Current Compton Imaging Effort for Homeland Security at LLNL

Imaging of extended 152 Eu source. 344 keV. Current Compton Imaging Effort for Homeland Security at LLNL. Address one of the outstanding problems for Homeland Security: “Faint” sources in the midst of background fluctuations Gamma-ray imaging to provide

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Current Compton Imaging Effort for Homeland Security at LLNL

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  1. Imaging of extended 152 Eu source 344 keV Current Compton Imaging Effort for Homeland Security at LLNL • Address one of the outstanding problems for Homeland Security: “Faint” sources in the midst of background fluctuations • Gamma-ray imaging to provide • Location and shape of nuclear materials • Increased sensitivity in the detection of nuclear materials (increase signal-to-background, distinguish threat sources from background fluctuations (spatially and temporarily) • Compton imaging provides high sensitivity with large FOV (4p) and w/o heavy collimators • Cryogenically cooled, large-volume Si(Li) + HPGe detector in double-sided strip configuration provide high sensitivity throughout energy range of interest for DHS (180 keV – 2.6 MeV) • Couple 4p Compton imager to 4p visual photo/video camera • Provide 3D imaging either in near field or by moving source or detector

  2. Current Compton Imaging effort for Homeland Security at LLNL Photo camera • Current Compact Compton Imager system consisting of 2 Si(Li) and 2 HPGe DSSDs • 3D position determination by combining 2D segmentation and pulse-shape analysis • 2D and 3D gamma-ray imaging • Combining 3D gamma-ray and visual images (LIDAR mapping system) Pre-amplifiers Example of signal shape fitting to deduce #, energies, and 3D position of interactions Si+Ge detectors Dewar 20 cm 2D gamma-ray + 3D visual images 3D gamma-ray + 3D visual images

  3. Proposal to DNDO/NSF 07-545 (Academic Research Initiative) to evaluate electron-tracking based Compton imaging • Reduce cone to arc without loosing angular resolution • Concept of Si-Drift Detectors

  4. Examples of measured electron tracks • Position • Track • DE/dx • Vertex (origin of track) • Complete vs. incomplete energy deposition • Particle identification?

  5. Opportunities for UC • 1m2-scale gamma-ray and neutron detectors and imagers to detect faint sources • Electron-tracking based imagers, e.g. LAr … • Gamma-ray imaging … • …. Connection to Biomedical Applications • (10th Campus UCSF…)

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