Event-by-Event Monte Carlo Simulation of Radiation Transport in Vapor and Liquid Water Papamichael, George J. creator 2009 xiv, 110 p. born digital Thesis (Ph.D.) -- Brown University (2009) Maxey, Martin reader Sirovich, Lawrence reader Emfietzoglou, Dimitris director Brown University. Applied Mathematics sponsor theses A Monte-Carlo Simulation is presented for Radiation Transport in water. This process is of outmost importance, having applications in oncology and therapy of cancer, in protecting people and the environment, waste management, radiation chemistry and on some solid-state detectors. It's also a phenomenon of interest in microelectronics on satellites in orbit that are subject to the solar radiation and in space-craft design for deep-space missions receiving background radiation. The interaction of charged particles with the medium is primarily due to their electromagnetic field. Three types of interaction events are considered: Elastic scattering, impact excitation and impact ionization. Secondary particles-electrons can be generated by ionizations. At each stage, along with the primary particle we explicitly follow all secondary electrons (and subsequent generations). Theoretical, semi-empirical and experimental formulae with suitable corrections have been used in each case to model the cross sections governing the quantum mechanical process of interactions, thus determining stochastically the energy and direction of outgoing particles following an event. Monte-Carlo sampling techniques have been applied to accurate probability distribution functions describing the primary particle track and all secondary particle-medium interaction. A simple account of the simulation code and a critical exposition of its underlying assumptions (often missing in the relevant literature) are also presented with reference to the model cross sections. Model predictions are in good agreement with existing computational data and experimental results. By relying heavily on a theoretical formulation, instead of merely fitting data, it is hoped that the model will be of value in a wider range of applications. Possible future directions that are the object of further research are pointed out. cross-section stopping power excitation charged-particle-transport straggling scattering Stopping power (Nuclear physics)IonizationNuclear excitationMicrodosimetryStraggling (Nuclear physics)Scattering (Physics) RPB 20091218 engEnglish10.7301/Z0VH5M27In CopyrightCollection is open for research.dissertations