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Liquid scintillator detectors are valuable for detection of special nuclear material since they are capable of detecting both neutrons and gamma rays. Furthermore, scintillators can also provide energy information which can help in identification and characterization of the source. In order to deign scintillation based measurement systems appropriate simulation tools are needed. MCNPX-PoliMi is capable...
Coded aperture neutron imaging detectors have the potential to be a powerful tool for the detection of special nuclear material at long range or under heavy shielding, using the signature of fast neutrons from spontaneous fission. We are building a prototype system using liquid scintillator cells, measuring 20" ?? 2.5" ?? 2.5" each, in a reconfigurable arrangement. A cross-calibration...
New results are presented on the passive measurement of mixed-oxide fuel pin assemblies. A fast and robust methodology for the characterization of mixed-oxide fuel pins is discussed. Four EJ-309 liquid scintillation detectors coupled with an accurate pulse timing and digital, offline, optimized pulse-shape discrimination method were used. Measurement analysis including pulse-height distributions and...
Production of medical radioisotopes at the Petten Research Reactor (NL) generates residues packed in cylindrical containers involving around 450 g of irradiated HEU each. Because the chemical process selectively removes the fission products, the verification can no longer rely on observation of conventional attributes such as gamma emissions of Cs-137. The International Atomic Energy Agency conducted...
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