Development of a scattering probability method for accurate vapor fraction measurements by neutron radiography. Revision 1

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Recent test results indicated drawbacks associated with the simple exponential attenuation method (SEAM) as currently applied to neutron radiography measurements to determine vapor fractions in a hydrogenous two-phase flow in a metallic conduit. The scattering component of the neutron beam intensity exiting the flow system is not adequately accounted for by SEAM, and this leads to inaccurate results. To properly account for the scattering effect, a neutron scattering probability method (SPM) is developed. The method applies a neutron-hydrogen scattering kernel to scattered thermal neutrons that leave the incident beam in narrow conduits but eventually show up elsewhere in the measurements. ... continued below

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13 p.

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Joo, H. & Glickstein, S.S. November 1, 1998.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Description

Recent test results indicated drawbacks associated with the simple exponential attenuation method (SEAM) as currently applied to neutron radiography measurements to determine vapor fractions in a hydrogenous two-phase flow in a metallic conduit. The scattering component of the neutron beam intensity exiting the flow system is not adequately accounted for by SEAM, and this leads to inaccurate results. To properly account for the scattering effect, a neutron scattering probability method (SPM) is developed. The method applies a neutron-hydrogen scattering kernel to scattered thermal neutrons that leave the incident beam in narrow conduits but eventually show up elsewhere in the measurements. The SPM has been tested with known vapor (void) distributions within an acrylic disk and a water/vapor channel. The vapor (void) fractions deduced by SPM are in good agreement with the known exact values. Details of the scattering correction method and the test results are discussed.

Physical Description

13 p.

Notes

INIS; OSTI as DE99000482

Source

  • 3. international topical meeting on neutron radiography, Lucerne (Switzerland), 16-19 Mar 1998

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  • Other: DE99000482
  • Report No.: WAPD-T--3142-Rev.1
  • Report No.: CONF-980337--
  • Grant Number: AC11-93PN38195
  • Office of Scientific & Technical Information Report Number: 291122
  • Archival Resource Key: ark:/67531/metadc677006

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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 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 16, 2016, 2:09 p.m.

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Joo, H. & Glickstein, S.S. Development of a scattering probability method for accurate vapor fraction measurements by neutron radiography. Revision 1, article, November 1, 1998; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc677006/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.