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									        Passive Time Coincidence Measurements with HEU Oxide Fuel Pins

                  Seth McConchie, Paul Hausladen, and John Mihalczo

                             Oak Ridge National Laboratory

                                   Brandon Blackburn

                               Idaho National Laboratory

Passive time coincidence measurements have been performed on HEU oxide fuel pins at
the Idaho National Laboratory Power Burst Facility. These experiments evaluate HEU
detection capability using passive coincidence counting when fast liquid scintillators.
Pulse shape discrimination was used with the liquid scintillators to distinguish neutrons
from gamma-rays. Data acquisition was performed with the Nuclear Material
Identification System (NMIS) to calculate the neutron and gamma coincidence time
distributions. The amounts of HEU measured were 1 kg, 4 kg, and 8 kg in sealed 55-
gallon drums. Data collected with the liquid scintillators include gamma-ray energy
thresholds at low energy (160 keV) and high energy (3 MeV) to evaluate the ability to
detect the presence of HEU using gamma-ray coincidences. This paper presents results
from the measurements.

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