MULECS: The Monash University Low Energy Compton scattering package

Monte Carlo based radiation transport modelling is a useful tool in evaluating the interaction and effect of radiation in a defined environment. The process of simulating Compton scattering is of interest in a large number of different fields. Of the range of available Monte Carlo radiation transport programs, Geant4, one of the most popular, integrated the effects of Doppler broadening into their standard low energy Compton scattering package in 2008. However, there still exists a significant limitation within this standard Compton scattering package regarding the algorithms that determine the emission direction of Compton electrons. Here we outline the development of the Monash University Low Energy Compton Scattering (MULECS) package. The package addresses the current limitation of Compton electron directionality of Geant4 through the inclusion of additional directional information of the pre-collision momentum. MULECS is intended to replace the standard Compton scattering package of Geant4 to improve the accuracy of emission imaging simulations below 2 MeV.