An electromagnetic physics constructor for low energy polarised X-/gamma ray transport in Geant4

Journal Article (2021)
Author(s)

J. M.C. Brown (TU Delft - RST/Medical Physics & Technology, University of Wollongong)

Matthew R. Dimmock (Monash University)

Research Group
RST/Medical Physics & Technology
Copyright
© 2021 J.M.C. Brown, Matthew R. Dimmock
DOI related publication
https://doi.org/10.1016/j.nimb.2021.06.009
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 J.M.C. Brown, Matthew R. Dimmock
Research Group
RST/Medical Physics & Technology
Volume number
502
Pages (from-to)
176-182
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Abstract

The production, application, and/or measurement of polarised X-/gamma rays are key to the fields of synchrotron science and X-/gamma-ray astronomy. The design, development and optimisation of experimental equipment utilised in these fields typically relies on the use of Monte Carlo radiation transport modelling toolkits such as Geant4. In this work the Geant4 “G4LowEPPhysics” electromagnetic physics constructor has been reconfigured to offer a best set of electromagnetic physics models for studies exploring the transport of low energy polarised X-/gamma rays. An overview of the physics models implemented in “G4LowEPPhysics”, and it's experimental validation against Compton X-ray polarimetry measurements of the BL38B1 beamline at the SPring-8 synchrotron (Sayo, Japan) is reported. “G4LowEPPhysics” is shown to be able to reproduce the experimental results obtained at the BL38B1 beamline (SPring-8) to within a level of accuracy on the same order as Geant4’s X-/gamma ray interaction cross-sectional data uncertainty (approximately ± 5 %).