BEAMnrc input file for phase-space generation in very small photon-field source modelling

This repository contains the BEAMnrc input file used to generate the Monte Carlo phase-space data analysed in the associated study of primary electron source-width sensitivity and photon angular phase space in very small photon fields. The file supports reproducibility of the treatment-head transport and phase-space generation component of the study. The repository does not contain patient data, proprietary manufacturer information, or machine-specific confidential geometry.