Far-Field Approximation in the Generalized Geometry Holdup (GGH) Model

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Quantitative gamma spectrometry measurements of uranium frequently require corrections for attenuation by an equipment or container layer and by the uranium bearing material itself. It is common to correct for attenuation using the ''far-field approximation''. Under this approximation, the minimum thickness of equipment or material is used for the correction rather than an average thickness over the detector field-of-view. In reality this aspect of the far-field approximation is really a narrow field-of-view approximation. The price of this simplification is the introduction of a bias. This bias will be investigated in this paper. In addition, there is a distance dependence of ... continued below

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Oberer, R. B.; Gunn, C. A. & Chiang, L. G. September 7, 2006.

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Quantitative gamma spectrometry measurements of uranium frequently require corrections for attenuation by an equipment or container layer and by the uranium bearing material itself. It is common to correct for attenuation using the ''far-field approximation''. Under this approximation, the minimum thickness of equipment or material is used for the correction rather than an average thickness over the detector field-of-view. In reality this aspect of the far-field approximation is really a narrow field-of-view approximation. The price of this simplification is the introduction of a bias. This bias will be investigated in this paper. In addition, there is a distance dependence of the radial response of a detector. This dependence will also be investigated.

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  • Report No.: Y/DK-2176 Rev 1
  • Grant Number: DE-AC05-00OR22800
  • DOI: 10.2172/900342 | External Link
  • Office of Scientific & Technical Information Report Number: 900342
  • Archival Resource Key: ark:/67531/metadc879095

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  • September 7, 2006

Added to The UNT Digital Library

  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 1, 2017, 4:14 p.m.

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Oberer, R. B.; Gunn, C. A. & Chiang, L. G. Far-Field Approximation in the Generalized Geometry Holdup (GGH) Model, report, September 7, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc879095/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.