A Monte Carlo simulation study for the gamma-ray/neutron dual-particle imager using rotational modulation collimator (RMC)

The aim of this work is to develop a gamma-ray/neutron dual-particle imager, based on rotational
modulation collimators (RMCs) and pulse shape discrimination (PSD)-capable scintillators, for
possible applications for radioactivity monitoring as well as nuclear security and safeguards. A
Monte Carlo simulation study was performed to design an RMC system for the dual-particle imaging,
and modulation patterns were obtained for gamma-ray and neutron sources in various configurations.
We applied an image reconstruction algorithm utilizing the maximum-likelihood
expectation-maximization method based on the analytical modeling of source-detector configurations,
to the Monte Carlo simulation results. Both gamma-ray and neutron source distributions were
reconstructed and evaluated in terms of signal-to-noise ratio, showing the viability of developing
an RMC-based gamma-ray/neutron dual-particle imager using PSD-capable scintillators.

Source: Journal of Radiological Protection - January 29, 2018 Category: Physics Authors: Hyun Suk Kim, Hong Yeop Choi, Gyemin Lee, Sung-Joon Ye, Martin B Smith and Geehyun Kim Source Type: research