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Accession Number DE2012-1055006
Title Demonstration of Emitted-Neutron Computed Tomography to Quantify Nuclear Materials.
Publication Date Sep 2011
Media Count 22p
Personal Author M. A. Blackston P. A. Hausladen R. J. Newby
Abstract 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.
Keywords Computerized tomography
Fast neutrons
Gamma radiation
Mixed oxide fuels
Neutron detectors
Neutron sources
Nuclear materials
Scintillator counters

Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 46 - Physics
77E - Nuclear Instrumentation
Corporate Author Oak Ridge National Lab., TN.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1308
Contract Number DE-AC05-00OR22725

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