Performance Portable Monte Carlo Particle Transport on Intel, NVIDIA, and AMD GPUs John Tramm, Paul Romano, Patrick Shriwise, Amanda Lund, Johannes Doerfert, Patrick Steinbrecher, Andrew Siegel and Gavin Ridley EPJ Web Conf., 302 (2024) 04010 Published online: 15 October 2024 DOI: 10.1051/epjconf/202430204010