Reconstructing the Position and Intensity of Multiple Gamma-Ray Point Sources with a Sparse Parametric Algorithm

Vavrek, J. R.; Hellfeld, D.; Bandstra, M. S.; Negut, V.; Meehan, K.; Vanderlip, W. J.; Cates, J. W.; Pavlovsky, R.; Quiter, B. J.; Cooper, R. J.; Joshi, T. H. Y.

doi:10.1109/tns.2020.3024735

Title: Reconstructing the Position and Intensity of Multiple Gamma-Ray Point Sources with a Sparse Parametric Algorithm

Journal Article · Mon Sep 21 00:00:00 EDT 2020 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/tns.2020.3024735· OSTI ID:1713225

Vavrek, J. R. ^[1]; Hellfeld, D. ^[1]; Bandstra, M. S. ^[1]; Negut, V. ^[1]; Meehan, K. ^[1]; Vanderlip, W. J. ^[2]; Cates, J. W. ^[1]; Pavlovsky, R. ^[1]; Quiter, B. J. ^[1]; Cooper, R. J. ^[1]; Joshi, T. H. Y. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)

IEEE We present an experimental demonstration of Additive Point Source Localization (APSL), a sparse parametric imaging algorithm that reconstructs the 3D positions and activities of multiple gamma-ray point sources. Using a handheld gamma-ray detector array and up to four 8 μCi ¹³⁷Cs gamma-ray sources, we performed both source-search and source-separation experiments in an indoor laboratory environment. In the majority of the source-search measurements, APSL reconstructed the correct number of sources with position accuracies of ~20 cm and activity accuracies (unsigned) of ~20%, given measurement times of two to three minutes and distances of closest approach (to any source) of ~20 cm. In source-separation measurements where the detector could be moved freely about the environment, APSL was able to resolve two sources separated by 75 cm or more given only ~60 s of measurement time. In these source-separation measurements, APSL produced larger total activity errors of ~40%, but obtained source separation distances accurate to within 15 cm. We also compare our APSL results against traditional Maximum Likelihood-Expectation Maximization (ML-EM) reconstructions, and demonstrate improved image accuracy and interpretability using APSL over ML-EM. These results indicate that APSL is capable of accurately reconstructing gamma-ray source positions and activities using measurements from existing detector hardware.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1713225

Journal Information:: IEEE Transactions on Nuclear Science, Vol. PP, Issue 99; ISSN 0018-9499

Publisher:: IEEECopyright Statement

Country of Publication:: United States

Language:: English

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