Plutonium Attribute Estimation From Passive NMIS Measurements at VNIIEF

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Currently, the most relevant application of NMIS for plutonium attribute estimation stems from measurements performed jointly by Oak Ridge National Laboratory (ORNL) and Russian Federal Nuclear Center, All-Russia Scientific Research Institute of Experimental Physics (RFNC-VNIIEF) personnel at RFNC-VNIIEF facilities in Sarov, Russia in June and July 2000. During these measurements at VNIIEF, NMIS was applied in its passive mode to eight unclassified plutonium spherical shells. The shells' properties spanned the following ranges: Composition: {delta}-phase plutonium-metal, constant; Relative {sup 240}Pu-content (f{sub 240Pu}): f{sub 240Pu} = 1.77% (g {sup 240}Pu/g Pu), constant; Inner radius (r{sub 1}): 10.0 mm {le} r{sub 1} {le} ... continued below

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10 pages

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Mattingly, J.K. January 17, 2002.

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Description

Currently, the most relevant application of NMIS for plutonium attribute estimation stems from measurements performed jointly by Oak Ridge National Laboratory (ORNL) and Russian Federal Nuclear Center, All-Russia Scientific Research Institute of Experimental Physics (RFNC-VNIIEF) personnel at RFNC-VNIIEF facilities in Sarov, Russia in June and July 2000. During these measurements at VNIIEF, NMIS was applied in its passive mode to eight unclassified plutonium spherical shells. The shells' properties spanned the following ranges: Composition: {delta}-phase plutonium-metal, constant; Relative {sup 240}Pu-content (f{sub 240Pu}): f{sub 240Pu} = 1.77% (g {sup 240}Pu/g Pu), constant; Inner radius (r{sub 1}): 10.0 mm {le} r{sub 1} {le} 53.5 mm, mean r{sub 1} = 33.5 mm; Outer radius (r{sub 2}): 31.5 mm {le} r{sub 2} {le} 60.0 mm, mean r{sub 2} = 46.6 mm; Radial thickness ({Delta}r): 6.4 mm {le} {Delta}r {le} 30.2 mm, mean {Delta}r = 13.1 mm; and Plutonium mass (m{sub Pu}): 1829 g {le} m{sub Pu} {le} 4468 g, mean m{sub Pu} = 3265 g. The features of these measurements were analyzed to extract the attributes of each plutonium shell. Given that the samples measured were of constant composition, geometry, and relative {sup 240}Pu-content, each shell is completely described by any two of the following four properties: Inner radius r{sub 1}; Outer radius r{sub 2}; Mass m, one of {sup 239}Pu mass m{sub {sup 239}Pu}, {sup 240}Pu mass m{sub {sup 240}Pu}, or total Pu mass m{sub Pu}; and Radial thickness {Delta}r. Of these, generally only mass is acknowledged as an attribute of interest; the second property (whichever is chosen) can be considered to be a parameter of the attribute-estimation procedure, much as multiplication is a parameter necessary to accurately estimate fissile mass via most neutron measurements.

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10 pages

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  • Other Information: PBD: 17 Jan 2002

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  • Report No.: ORNL/TM-2002/20
  • Grant Number: AC05-00OR22725
  • DOI: 10.2172/814039 | External Link
  • Office of Scientific & Technical Information Report Number: 814039
  • Archival Resource Key: ark:/67531/metadc734345

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  • January 17, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • March 31, 2016, 1:11 p.m.

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Mattingly, J.K. Plutonium Attribute Estimation From Passive NMIS Measurements at VNIIEF, report, January 17, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc734345/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.