Active and passive computed tomography for nondestructive assay

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Traditional gamma-ray methods used to characterize nuclear waste introduce errors that are related to non-uniform measurement responses associated with unknown radioactive source and matrix material distributions. These errors can be reduced by applying an active and passive tomographic technique (A&PCT) developed at the Lawrence Livermore National Laboratory (LLNL). The technique uses an external radioactive source and active tomography to map the attenuation within a waste barrel as a function of mono-energetic gamma-ray energy. Passive tomography is used to localize and identify specific radioactive waste within the same container. Reconstruction of the passive data using the attenuation maps at specific energies ... continued below

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Bernardi, R T; Camp, D E; Clard, D; Jackson, J A; Martz, H E, Decman, D J & Roberson, G P October 28, 1998.

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Traditional gamma-ray methods used to characterize nuclear waste introduce errors that are related to non-uniform measurement responses associated with unknown radioactive source and matrix material distributions. These errors can be reduced by applying an active and passive tomographic technique (A&PCT) developed at the Lawrence Livermore National Laboratory (LLNL). The technique uses an external radioactive source and active tomography to map the attenuation within a waste barrel as a function of mono-energetic gamma-ray energy. Passive tomography is used to localize and identify specific radioactive waste within the same container. Reconstruction of the passive data using the attenuation maps at specific energies allows internal waste radioactivity to be corrected for any overlying heterogeneous materials, thus yielding an absolute assay of the waste activity. LLNL and Bio-Imaging Research, Inc. have collaborated in a technology transfer effort to integrate an A&PCT assay system into a mobile waste characterization trailer. This mobile system has participated in and passed several formal DOE-sponsored performance demonstrations, tests and evaluations. The system is currently being upgraded with multiple detectors to improve throughput, automated gamma-ray analysis code to simplify the assay, and a new emission reconstruction code to improve accuracy

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  • 6th Nondestructive Assay Waste Characterization Conference, Salt Lake City, UT, November 17-19, 1998

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  • Other: DE00007550
  • Report No.: UCRL-JC-132310
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 7550
  • Archival Resource Key: ark:/67531/metadc711268

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  • October 28, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 6, 2016, 8:57 p.m.

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Bernardi, R T; Camp, D E; Clard, D; Jackson, J A; Martz, H E, Decman, D J & Roberson, G P. Active and passive computed tomography for nondestructive assay, article, October 28, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc711268/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.