title: On the use of Monte Carlo simulations to model transport of positrons in gases and liquids.
abstract: In this paper we make a parallel between the swarm method in physics of ionized gases and modeling of positrons in radiation therapy and diagnostics. The basic idea is to take advantage of the experience gained in the past with electron swarms and to use it in establishing procedures of modeling positron diagnostics and therapy based on the well-established experimental binary collision data. In doing so we discuss the application of Monte Carlo technique for positrons in the same manner as used previously for electron swarms, we discuss the role of complete cross section sets (complete in terms of number, momentum and energy balance and tested against measured swarm parameters), we discuss the role of benchmarks and how to choose benchmarks for electrons that may perhaps be a subject to experimental verification. Finally we show some samples of positron trajectories together with secondary electrons that were established solely on the basis of accurate binary cross sections and also how those may be used in modeling of both gas filled traps and living organisms.
authors: Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia.
authors: Zoran Lj
authors: ZLj
authors: Petrović
authors: Srdjan
authors: S
authors: Marjanović
authors: Saša
authors: S
authors: Dujko
authors: Ana
authors: A
authors: Banković
authors: Gordana
authors: G
authors: Malović
authors: Stephen
authors: S
authors: Buckman
authors: Gustavo
authors: G
authors: Garcia
authors: Ron
authors: R
authors: White
authors: Michael
authors: M
authors: Brunger
keywords: Benchmarks; Monte Carlo simulations; Positrons; Radiation damage