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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...
Calculations are presented to support the claim that fast neutron detection systems can achieve higher performance in detecting weak neutron sources than conventional thermal neutron detection systems involving moderators. Minimum Detectable Limits (MDL) are used as a comparative metric, more representative than the metric of absolute sensitivity, which does not take into account the influence of...
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...
There is an existing database of secondary neutron production cross sections and thick-target yields from heavy-ion interactions that have been used extensively for benchmarking transport model calculations such as PHITS, MARS, FLUKA, GEANT4, HETC-HEDS, MCNPX-HI, and SHIELD-HIT. These data are especially relevant to the development of transport models used to simulate Galactic Cosmic Ray (GCR) transport...
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