The Development of a Parameterized Scatter Removal Algorithm for Nuclear Materials Identification System Imaging

Active Neutron Interrogation of Non-Radiological Materials with NMIS

“…A scattering correction can be made to compensate for forward neutron scattering (Grogan, 2010) but was not carried out on this set of measurements. While a scattering correction would improve the accuracy of the aluminum neutron attenuation value, it would worsen the polyethylene attenuation value, because very little forward neutron scattering occurs inside polyethylene.…”

“…Each simulation contained 1×10 7 source particles. Both simulations were post-processed using PolimiPP software (Grogan, 2010), which recorded the energy deposited in the NaI detector by each photon that could be correlated with a source neutron. Photon peaks are visible from both simulations, and it is visibly apparent that the gamma spectra for the two different materials are very different.…”

Incorporation of Photon Analysis into an Active Interrogation System for Shielded Uranium Characterization

“…In the past, when comparing the data from NMIS to simulations done in PoliMi and parsed by the post processor written by B. Grogan (39) and J. Henkel, there have been some large differences. In general, it has been noted that small detectors are much better modeled by simulations than larger detectors (34).…”

Research and development of a dedicated collimator for 14.2 MeV fast neutrons for imaging using a D-T generator

“…In conventional x-ray CT this problem is mostly dealt with hardware solutions such as high Z materials anti-scatter grids which are part of the detecting system, preventing the scattered photons from reaching the detector. There are also numerous attempts to solve the issue by using software corrections [1][2][3]. Both are complicated, do not solve the problem completely and may eventually induce new artifacts.…”