Recent Developments in the MCNP-POLIMI Postprocessing Code

Abstract

The design and analysis of measurements performed with organic scintillators rely on the use of Monte Carlo codes to simulate the interaction of neutrons and photons, originating from fission and other reactions, with the materials present in the system and the radiation detectors. MCNP-PoliMi is a modification of the MCNP-4c code that models the physics of secondary particle emission from fission and other processes realistically. This characteristic allows for the simulation of the higher moments of the distribution of the number of neutrons and photons in a multiplying system. The present report describes the recent additions to the MCNP-PoliMi post-processing code. These include the simulation of detector dead time, multiplicity, and third order statistics.

Analysis of a measured neutron background below 6MeV for fast-neutron imaging systems

“…The MCNPX-PoliMi code was derived from the MCNPX code and has advanced features which serve this purpose [30]. The main features of the MCNPX-PoliMi code are as follows: 1) The simulation of spontaneous and induced fission using the correct multiplicity of prompt neutrons and gamma rays from individual fission events.…”

Offline Pulse-Shape Discrimination Algorithms for Neutron Spectrum Unfolding

“…Another advantage of the MCNP-PoliMi code is that detailed information on the interactions of neutrons and gamma rays inside user-defined cells (typically detectors) are printed to a collision output file. These collisions are then analyzed with a dedicated postprocessing code, which takes into account all important properties of the detector [9]. Fig.…”

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

“…For each event, the light output is computed using an algorithm based on the detector type. For a plastic scintillator, the light output (pulse height) produced by an energy transfer, E in , is 62 • Photon on hydrogen or carbon: PH = E in .…”