Polaris-LAMP: Multi-Modal 3-D Image Reconstruction With a Commercial Gamma-Ray Imager

Journal Article · Fri Oct 01 00:00:00 EDT 2021 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/TNS.2021.3110162· OSTI ID:1826410

Hecla, J.; Knecht, K. ; Gunter, D.; Haefner, A.; Hellfeld, D. ; Joshi, T. H. Y. ; Moran, A.; Negut, V.; Pavlovsky, R.; Vetter, K.

The Polaris-LAMP multi-modal 3D gamma-ray imager is a radiation mapping and imaging platform which uses a commercial-off-the-shelf detector integrated with a contextual sensor localization and mapping platform. The integration of these systems enables a free-moving radiation imaging capability with proximity mapping, coded aperture, and Compton imaging modalities, which can create 3D reconstruction of photon sources from tens of keV to several MeV. Gamma-ray events are recorded using a segmented cadmium zinc telluride detector (Polaris-H Quad by H3D inc.), while scene data is derived from a contextual sensor and computation package developed by Lawrence Berkeley National Laboratory which includes GPS, laser ranging and inertial measurement sensors. An onboard computer uses these inputs to create rapidly-updating pose (10 Hz) and 3D scene estimates using a simultaneous localization and mapping algorithm. The precise gamma-ray event location and timing resolution of the Polaris CZT sensor enables Compton imaging above several hundred keV, while photon sources at lower images are localized using coded aperture imaging techniques. The multi-modal imaging concept enables imaging of diverse radiation sources spanning from the 59 keV emission of 241Am to the 1.1 and 1.3 MeV lines of 60Co. This work focuses on the description of the the operational principles of the detector system and demonstrating the 3D imaging performance in a variety of source detection and mapping scenarios. As a proof of concept, we demonstrate mapping complex environments, including both point source and distributed-source environments using proximity, coded aperture, and Compton imaging modalities. Further, we show the successful use of the system to perform measurements in high-background environments through analysis of arrays of uranium hexafluoride cylinders at the Paducah UF6 project site.

• Research Organization: Univ. of California, Berkeley, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Security
• Grant/Contract Number: AC02-05CH11231; NA0000979; NA0003180; 10027-21370; 10027-23334; 10027-25522
• OSTI ID: 1826410
• Alternate ID(s): OSTI ID: 1821711; OSTI ID: 1826411
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Vol. 68 Journal Issue: 10; ISSN 0018-9499
• Publisher: Institute of Electrical and Electronics Engineers
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
61 RADIATION PROTECTION AND DOSIMETRY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
Detectors
Three-dimensional displays
Imaging
Simultaneous localization and mapping
Location awareness
Laser radar
Image reconstruction
Compton imaging
Coded aperture imagers
Scene data fusion
3D gamma-ray imaging