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The dual-particle imaging system being developed at the University of Michigan was used at the Joint Research Centre in Ispra, Italy for measurements on samples of special nuclear material. A 1,150-g mixed-oxide (MOX) fuel sample was measured with various shielding configurations to determine how the presence of lead and/or polyethylene shielding degrades the system's ability to localize a source...
Nondestructive assay (NDA) of uranium samples is typically performed using either active neutron multiplicity counting or passive gamma-ray spectroscopy. For large quantities (around 10 kg) of pure, highly enriched uranium (HEU) such as HEU oxide, active well coincidence counters (AWCCs) are widely used to detect time-correlated neutrons from neutron-induced fission with 3He tubes embedded in a polyethylene...
An advanced dual-particle imaging system is being developed for standoff, passive detection of special nuclear material. This system consists of three detector planes and will be capable of imaging both photons and fast neutrons. The ability of the system to detect fast neutrons makes it more difficult to effectively shield a threat source. This feature has an advantage over the commonly used Compton-camera...
Active well coincidence counters (AWCCs) are widely used for nondestructive assay and nuclear-safeguards applications, mainly for special nuclear material. The measurement method is based on the detection of time-correlated neutrons from fission by 3He tubes embedded in a polyethylene moderator. The purported advantage of this method over traditional gamma-ray spectral analysis is the greater penetrability...
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