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Accession Number
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DE2012-1055006
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Title
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Demonstration of Emitted-Neutron Computed Tomography to Quantify Nuclear Materials.
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Publication Date
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Sep 2011
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Media Count
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22p
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Personal Author
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M. A. Blackston P. A. Hausladen R. J. Newby
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Abstract
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In this document, we report demonstration of emitted-neutron computed tomography using fast fission neutrons to infer the geometry of sources of special nuclear material. The imaging system employed in the demonstration is based on a newly constructed array of pixelated neutron detectors suitable for arrangement in a close-packed imaging array and whose active volume consists of liquid scintillator EJ-309, which allows neutron-gamma discrimination via pulse shape to enable essentially pure fast-neutron imaging. The system is capable of high quality fast-neutron imaging where tomographic reconstruction of slices through an object resolves neutron sources similar in dimension to a fuel pellet, or about 1 cm. During measurements of plutonium mixed oxide fuel rodlet arrays in soup cans at the Zero Power Physics Reactor facility at Idaho National Laboratory, the position of a partial defect of a single rodlet containing plutonium being replaced by one containing depleted uranium was detected.
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Keywords
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Computerized tomography
Fast neutrons
Gamma radiation
Images
Mixed oxide fuels
Neutron detectors
Neutron sources
Neutrons
Nuclear materials
Plutonium
Scintillator counters
Uranium
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Source Agency
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Technical Information Center Oak Ridge Tennessee
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NTIS Subject Category
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46 - Physics
77E - Nuclear Instrumentation
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Corporate Author
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Oak Ridge National Lab., TN.
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Document Type
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Technical report
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Title Note
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N/A
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NTIS Issue Number
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1308
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Contract Number
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DE-AC05-00OR22725
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