Imaging of heterogeneous materials by prompt gamma-ray neutron activation analysis

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The authors have used a tomographic gamma scanner (TGS) to produce tomographic prompt gamma-ray neutron activation analysis imaging (PGNAA) of heterogeneous matrices. The TGS was modified by the addition of graphite reflectors that contain isotopic neutron sources for sample interrogation. The authors are in the process of developing the analysis methodology necessary for a quantitative assay of large containers of heterogeneous material. This nondestructive analysis (NDA) technique can be used for material characterization and the determination of neutron assay correction factors. The most difficult question to be answered is the determination of the source-to-sample coupling term. To assist in the ... continued below

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3 p.

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Staples, P.; Prettyman, T. & Lestone, J. December 1, 1998.

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The authors have used a tomographic gamma scanner (TGS) to produce tomographic prompt gamma-ray neutron activation analysis imaging (PGNAA) of heterogeneous matrices. The TGS was modified by the addition of graphite reflectors that contain isotopic neutron sources for sample interrogation. The authors are in the process of developing the analysis methodology necessary for a quantitative assay of large containers of heterogeneous material. This nondestructive analysis (NDA) technique can be used for material characterization and the determination of neutron assay correction factors. The most difficult question to be answered is the determination of the source-to-sample coupling term. To assist in the determination of the coupling term, the authors have obtained images for a range of sample that are very well characterized, such as, homogenous pseudo one-dimensional samples to three-dimensional heterogeneous samples. They then compare the measurements to MCNP calculations. For an accurate quantitative measurement, it is also necessary to determine the sample gamma-ray self attenuation at higher gamma-ray energies, namely pair production should be incorporated into the analysis codes.

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3 p.

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INIS; OSTI as DE99000664

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  • 9. symposium on radiation measurements and applications, Ann Arbor, MI (United States), 11-14 May 1998

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  • Other: DE99000664
  • Report No.: LA-UR--98-1741
  • Report No.: CONF-980545--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 677021
  • Archival Resource Key: ark:/67531/metadc704448

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  • December 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • May 5, 2016, 7:32 p.m.

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Staples, P.; Prettyman, T. & Lestone, J. Imaging of heterogeneous materials by prompt gamma-ray neutron activation analysis, article, December 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc704448/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.