| Zugriffsnummer | 18474 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Simulation of the measured ionization-cluster distributions of alpha-particles in nanometric volumes of propane |
| Autor(in); Institution |
De Nardo, L.; INFN, Laboratori Nazionale di Legnaro, Legnaro, ITALY
Colautti, P.; INFN, Laboratori Nazionale di Legnaro, Legnaro, ITALY
Großwendt, Bernd; 6.6, Grundlagen der Dosimetrie, PTB-Braunschweig
|
| Quelle/Jahr | Microdosimetry : proceedings of the 14th International Symposium on Microdosimetry. Radiation Protection Dosimetry: 122 (2006), 1/4, 427 - 431 |
| ISSN | 0144-8420 |
| ISBN | 978-0-19-923171-3 |
| DOI | |
| Verlag | Oxford: Oxford University Press |
| Konferenzangaben | 14th International Symposium on Microdosimetry, Venice, 13-18, November, 2005, Italy |
| Freie Schlagworte | Nanodosimetry ; Ionization cluster-size distributions ; Single-electron counting ; Track-nanodosimetric counter |
| Zusammenfassung | In the last years, the probability of the formation of ionization clusters by primary α-particles at 5.4 MeV in nanometric volumes of propane (20.6 nm and 24.0 nm in a material of density 1.0 g/cm3) was studied experimentally and by Monte Carlo simulation, as a function of the distance of the centre line of the particle beam from the sensitive volume (SV). The Monte Carlo calculations were performed taking into account the single electron detection efficiency of the track-nanodosimetric counter, which was estimated on the base of Monte Carlo calculations of electron transport inside the detector. Due to the long drift distance (more than 20 cm), an exact treatment of the electron motion inside the counter was very time consuming and the approximation of disregarding the very weak radial component of the electric field was adopted in a wide region of the detector. With the availability of more calculation power, a new evaluation of the efficiency has been performed taking into account a more realistic description of the electric field inside the counter, pointing out a value lower than previously estimated. Besides, the efficiency of the counter in resolving temporally the collected electrons has been estimated, together with its effect on the measured distribution. On the base of these evaluations, a new comparison has been performed between measurements and calculations, pointing out a better agreement than previously estimated |
