Portable gamma-ray holdup and attributes measurements of high- and variable-burnup plutonium

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High burnup-plutonium holdup has been assayed quantitatively by low resolution gamma-ray spectrometry. The assay was calibrated with four plutonium standards representing a range of fuel burnup and {sup 241}Am content. Selection of a calibration standard based on its qualitative spectral similarity to gamma-ray spectra of the process material is partially responsible for the success of these holdup measurements. The spectral analysis method is based on the determination of net counts in a single spectral region of interest (ROI). However, the low-resolution gamma-ray assay signal for the high-burnup plutonium includes unknown amounts of contamination from {sup 241}Am. For most needs, the ... continued below

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Pages: (12 p)

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Wenz, T.R.; Russo, P.A.; Miller, M.C.; Menlove, H.O. (Los Alamos National Lab., NM (United States)); Takahashi, S.; Yamamoto, Y. et al. January 1, 1991.

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High burnup-plutonium holdup has been assayed quantitatively by low resolution gamma-ray spectrometry. The assay was calibrated with four plutonium standards representing a range of fuel burnup and {sup 241}Am content. Selection of a calibration standard based on its qualitative spectral similarity to gamma-ray spectra of the process material is partially responsible for the success of these holdup measurements. The spectral analysis method is based on the determination of net counts in a single spectral region of interest (ROI). However, the low-resolution gamma-ray assay signal for the high-burnup plutonium includes unknown amounts of contamination from {sup 241}Am. For most needs, the range of calibration standards required for this selection procedure is not available. A new low-resolution gamma-ray spectral analysis procedure for assay of {sup 239}Pu has been developed. The procedure uses the calculated isotope activity ratios and the measured net counts in three spectral ROIs to evaluate and remove the {sup 241}Am contamination from the {sup 239}Pu assay signal on a spectrum-by-spectrum basis. The calibration for the new procedure requires only a single plutonium standard. The procedure also provides a measure of the burnup and age attributes of holdup deposits. The new procedure has been demonstrated using portable gamma-ray spectroscopy equipment for a wide range of plutonium standards and has also been applied to the assay of {sup 239}Pu holdup in a mixed oxide fuel fabrication facility. 10 refs., 5 figs., 3 tabs.

Physical Description

Pages: (12 p)

Notes

OSTI; NTIS; INIS; GPO Dep.

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  • 4. international conference on facility operations/safeguards interface, Albuquerque, NM (United States), 29 Sep - 4 Oct 1991

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  • Other: DE92002469
  • Report No.: LA-UR-91-3323
  • Report No.: CONF-910901--18
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5142889
  • Archival Resource Key: ark:/67531/metadc1060098

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:05 p.m.

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Wenz, T.R.; Russo, P.A.; Miller, M.C.; Menlove, H.O. (Los Alamos National Lab., NM (United States)); Takahashi, S.; Yamamoto, Y. et al. Portable gamma-ray holdup and attributes measurements of high- and variable-burnup plutonium, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1060098/: accessed April 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.