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Comparing Imaging and Non-Imaging Techniques for Reducing Background Clutter and Resolving Distant Point Sources

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To reach maximum sensitivity, any method used to search for orphan sources must be insensitive to local variations of the background. Using imaging and non-imaging techniques, we analyzed the same data acquired by a search instrument deployed as a large-area, coded-mask imager. Data from many passes past a 1 mCi source at 65 m from the instrument were used to construct a model of the instrument response. We then used the model to ''hide'' the source in data taken in a light urban environment. We compared the success of detecting the hidden sources using imaging coded-mask methods, pseudo-imaging based on ... continued below

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Wurtz, R; Ziock, K; Fabris, L & Graham, R November 10, 2005.

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To reach maximum sensitivity, any method used to search for orphan sources must be insensitive to local variations of the background. Using imaging and non-imaging techniques, we analyzed the same data acquired by a search instrument deployed as a large-area, coded-mask imager. Data from many passes past a 1 mCi source at 65 m from the instrument were used to construct a model of the instrument response. We then used the model to ''hide'' the source in data taken in a light urban environment. We compared the success of detecting the hidden sources using imaging coded-mask methods, pseudo-imaging based on a zero-area matched filter, and non-imaging using simple thresholding. The results clearly indicate the superiority of imaging with the coded-mask techniques returning the best results.

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PDF-file: 7 pages; size: 0 Kbytes

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  • Presented at: 2005 IEEE Nuclear Science Symposium and Medical Imaging Conference, Fajardo, PR, United States, Oct 23 - Oct 29, 2005

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  • Report No.: UCRL-CONF-217039
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 888604
  • Archival Resource Key: ark:/67531/metadc885015

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • November 10, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 22, 2016, 10:59 p.m.

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Wurtz, R; Ziock, K; Fabris, L & Graham, R. Comparing Imaging and Non-Imaging Techniques for Reducing Background Clutter and Resolving Distant Point Sources, article, November 10, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc885015/: accessed January 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.