title: Monte Carlo simulation of semiconductor detector response to (222)Rn and (220)Rn environments.
abstract: A new electronic radon/thoron monitor employing semiconductor detectors based on a passive diffusion chamber design has been recently developed at the Helmholtz Zentrum München (HMGU). This device allows for acquisition of alpha particle energy spectra, in order to distinguish alpha particles originating from radon and radon progeny decays, as well as those originating from thoron and its progeny decays. A Monte-Carlo application is described which uses the Geant4 toolkit to simulate these alpha particle spectra. Reasonable agreement between measured and simulated spectra were obtained for both (220)Rn and (222)Rn, in the energy range between 1 and 10 MeV. Measured calibration factors could be reproduced by the simulation, given the uncertainties involved in the measurement and simulation. The simulated alpha particle spectra can now be used to interpret spectra measured in mixed radon/thoron atmospheres. The results agreed well with measurements performed in both radon and thoron gas environments. It is concluded that the developed simulation allows for an accurate prediction of calibration factors and alpha particle energy spectra.
authors.affiliation: Helmholtz Zentrum München, Institute of Radiation Protection, Ingolstädter Landstraße 1, 85764 Oberschleißheim, Germany. Electronic address: josef.irlinger@helmholtz-muenchen.de.
authors.forename: J
authors.initials: J
authors.lastname: Irlinger
authors.affiliation: Technische Universität München, Physik-Department, 85748 Garching, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Trinkl
authors.affiliation: Helmholtz Zentrum München, Institute of Radiation Protection, Ingolstädter Landstraße 1, 85764 Oberschleißheim, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Wielunksi
authors.affiliation: Helmholtz Zentrum München, Institute of Radiation Protection, Ingolstädter Landstraße 1, 85764 Oberschleißheim, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Tschiersch
authors.affiliation: Helmholtz Zentrum München, Institute of Radiation Protection, Ingolstädter Landstraße 1, 85764 Oberschleißheim, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Rühm
mesh_terms: D000396:Air Pollutants, Radioactive / Q000032:analysis*; D000512:Alpha Particles; D003198:Computer Simulation; D004777:Environment; D009010:Monte Carlo Method; D011834:Radiation Monitoring / Q000379:methods; D011886:Radon / Q000032:analysis*; D012666:Semiconductors
chemical_list: D000396:Air Pollutants, Radioactive; D011886:Radon
keywords: Detector; Monte-Carlo; Radon; Simulation; Spectroscopy; Thoron