Implementation of advanced matrix corrections for active interrogation of waste drums using the CTEN instrument

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The combined thermal/epithermal neutron instrument (CTEN) was designed at Los Alamos to improve measurement accuracy and mitigate self shielding effects inherent in the differential dieaway technique (DDT). A major goal in this research effort has been the development of a calibration technique that incorporates recently developed matrix and self-shielding corrections using data generated from additional detectors and new acquisition techniques. A comprehensive data set containing both active and passive measurements was generated using 26 different matrices and comprising a total of 1,400 measurements. In all, 31 flux-and-matrix-dependent parameters, 24 positional parameters, two dieaway times, and a correlated ratio were determined ... continued below

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8 p.

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Melton, S.; Estep, R. & Hollas, C. December 31, 1998.

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Description

The combined thermal/epithermal neutron instrument (CTEN) was designed at Los Alamos to improve measurement accuracy and mitigate self shielding effects inherent in the differential dieaway technique (DDT). A major goal in this research effort has been the development of a calibration technique that incorporates recently developed matrix and self-shielding corrections using data generated from additional detectors and new acquisition techniques. A comprehensive data set containing both active and passive measurements was generated using 26 different matrices and comprising a total of 1,400 measurements. In all, 31 flux-and-matrix-dependent parameters, 24 positional parameters, two dieaway times, and a correlated ratio were determined from each of the over 1,400 measurements. A reduced list of matrix indicators, prioritized using the alternating conditional expectation (ACE) algorithm, was used to train a neural network using a generalized regression technique (GRNN) to determine matrix- and position-corrected calibration factors. This paper describes the experimental, analytical, and empirical techniques used to determine the corrected calibration factor for an unknown waste drum. Results from a range of cases are compared with those obtained using a mobile DDT instrument and traditional DDT algorithms.

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8 p.

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INIS; OSTI as DE99002306

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  • 39. Institute of Nuclear Materials Management (INMM) annual meeting, Naples, FL (United States), 26-30 Jul 1998

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  • Other: DE99002306
  • Report No.: LA-UR--98-3250
  • Report No.: CONF-980733--
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 335169
  • Archival Resource Key: ark:/67531/metadc687424

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1998

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  • July 25, 2015, 2:20 a.m.

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  • June 13, 2016, 7:44 p.m.

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Melton, S.; Estep, R. & Hollas, C. Implementation of advanced matrix corrections for active interrogation of waste drums using the CTEN instrument, article, December 31, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc687424/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.