Full Range MGA Plutonium Isotopic Analysis using Single Ge Detector

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The Gamma-Ray multi-group analysis code MGA developed at Lawrence Livermore National Laboratory has been widely used in the area of gamma-ray non-destructive plutonium assay. This plutonium isotopic analysis code de-convolutes the complicated, 100-keV x-ray and gamma-ray region to obtain the ratio of Pu isotopes. Calibration of the detector efficiency is not required, but is determined intrinsically from the measured spectra. The code can either analyze low-energy gamma-ray spectrum taken using a high-resolution HPGe detector for energies below 300 keV, or analyze the low-energy spectrum combined with a high-energy spectrum (up to 1 MeV) in the two-detector analysis mode. In the ... continued below

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196 Kilobytes pages

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Buckley, W.M.; Wang, T.F.; Friensehner, A.; Kreek, S.A.; Lanier, R.G.; Parker, W.E. et al. June 26, 2000.

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The Gamma-Ray multi-group analysis code MGA developed at Lawrence Livermore National Laboratory has been widely used in the area of gamma-ray non-destructive plutonium assay. This plutonium isotopic analysis code de-convolutes the complicated, 100-keV x-ray and gamma-ray region to obtain the ratio of Pu isotopes. Calibration of the detector efficiency is not required, but is determined intrinsically from the measured spectra. The code can either analyze low-energy gamma-ray spectrum taken using a high-resolution HPGe detector for energies below 300 keV, or analyze the low-energy spectrum combined with a high-energy spectrum (up to 1 MeV) in the two-detector analysis mode. In the latter case, the use of two detectors has been mandated by the conflicting requirements: excellent resolution at low energies (characteristic of small planar detectors) with good high-energy efficiency (characteristic of coaxial detectors). Usually, a high-energy spectrum taken using a coaxial Ge detector will not provide sufficient energy resolution for 100-keV plutonium isotopic analysis, while the small planar used at low energies has inadequate high-energy efficiency. An optimized-geometry ORTEC HPGe detector has been developed which combines good energy resolution at 100 keV combined with acceptable high-energy ({approx} 1 MeV) efficiency in a single detector. It has been used to gather spectra of both low- and high-energy regions of plutonium spectra simultaneously, for analysis by MGA in the two-detector mode. Five Pu gamma-ray calibration standard sources were used in this study of this special detector.

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196 Kilobytes pages

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  • Institute of Nuclear Materials Management 41st Annual Meeting, New Orleans, LA (US), 07/16/2000--07/20/2000

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  • Report No.: UCRL-JC-137275
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 790401
  • Archival Resource Key: ark:/67531/metadc719761

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  • June 26, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • May 6, 2016, 1:24 p.m.

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Buckley, W.M.; Wang, T.F.; Friensehner, A.; Kreek, S.A.; Lanier, R.G.; Parker, W.E. et al. Full Range MGA Plutonium Isotopic Analysis using Single Ge Detector, article, June 26, 2000; California. (digital.library.unt.edu/ark:/67531/metadc719761/: accessed August 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.