The propagation of radiation in complex material geometries is governed by an integro-differential equation known as the transport equation. Although several analytical solutions are known, these apply for simple radiation sources, for a limited number of interaction mechanisms (often just one or two), and for extremely simplified geometries (typically infinite media). Instead, the Monte Carlo (MC) method provides an efficient approach to solve the transport equation for nearly arbitrary radiation sources and complex material geometries. The MC method consists in numerically simulating an ensemble of particle trajectories emanating from the radiation source and undergoing prescribed interaction mechanisms, each governed by its interaction cross section (indicating the likelihood of each process) and by a differential cross section (describing how various possible final states are populated as a result of each interaction). The generation of secondary particles from inelastic interactions is naturally included, thus making the MC method a natural framework to simulate coupled hadronic and electromagnetic radiation showers. A statistical analysis of the simulated ensemble of particle trajectories allows for an estimate of a broad range of radiometric observables, e.g. energy deposition, particle production spectra, radioactive inventories, etc. In this talk, the fundamental ideas underlying the MC method for radiation transport problems shall be discussed, paying particular attention to highlight not only its virtues but also its assumptions and limitations.
Short Bio Francesc Salvat Pujol
Francesc Salvat Pujol holds a PhD from the Technische Universität Wien on the measurement, transport theory, and Monte Carlo simulation of on secondary electron emission from solids under low-energy electron bombardment (2012). After a postdoc on solid-state theory and an escapade in metallurgic industry, Francesc went on to do a postdoc at the National Institute of Standards and Technology (NIST) on Monte Carlo simulations for nanoscale metrology with electron beams. In late 2016, Francesc joined CERN as a staff physicist to work on the development of radiation-matter interaction mechanisms for FLUKA, a general-purpose code for the Monte Carlo simulation of particle transport, addressing among other the hadronic interaction of deuterons.
Massimo Giovannozzi / Participants: 200