title: Proton-induced frequency distributions of ionization cluster size in propane.
abstract: The frequency distribution of clustered ionizations produced by a proton beam was measured in a nanodosimetric volume of the size of a DNA segment by means of an ion-counting nanodosimeter in the energy range from 0.4 to 3.5 MeV. In order to meet the needs of the ion-counting nanodosimeter, the accelerator's primary beam was reduced in intensity by means of Rutherford scattering. The comparison between experimental results and Monte Carlo simulations show a good agreement in the energy dependence of the mean cluster size, while the experimental cluster size distributions show a higher amount of large ionization clusters compared with those obtained with the simulations.
authors.affiliation: Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany. gerhard.hilgers@ptb.de
authors.forename: G
authors.initials: G
authors.lastname: Hilgers
authors.forename: E
authors.initials: E
authors.lastname: Gargioni
authors.forename: B
authors.initials: B
authors.lastname: Grosswendt
authors.forename: S
authors.initials: S
authors.lastname: Shchemelinin
mesh_terms: D003198:Computer Simulation; D004247:DNA / Q000235:genetics* / Q000528:radiation effects*; D004249:DNA Damage; D004307:Dose-Response Relationship, Radiation; D007477:Ions; D008956:Models, Chemical; D011407:Propane / Q000737:chemistry* / Q000528:radiation effects*; D011522:Protons; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*
chemical_list: D007477:Ions; D011522:Protons; D004247:DNA; D011407:Propane