| Zugriffsnummer | 18477 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | Formation of ion clusters by low-energy electrons in nanometric targets: Experiment and Monte Carlo simulation |
| Autor(in); Institution |
Bantsar, A.; Soltan Institute for Nuclear Studies, Otwock-Swierk, POLAND
Großwendt, Bernd; 6.6, Grundlagen der Dosimetrie, PTB-Braunschweig
Pszona, S.; Soltan Institute for Nuclear Studies, Otwock-Swierk, POLAND
|
| Quelle/Jahr | Microdosimetry : proceedings of the 14th International Symposium on Microdosimetry. Radiation Protection Dosimetry: 122 (2006), 1/4, 82 - 85 |
| 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 ; Jet counter ; Ionization cluster-size formation ; Single-ion counting |
| Zusammenfassung | Short segments of the DNA are the main targets for the initiation of radio-biological effects. Because of the nanometric target size, the initiation of radiation damage is caused to the greater part by single particle interactions. For a detailed understanding of radiation-induced effects, therefore, the overlay of the track structure of an ionizing particle and of target volumes of nanometre size has to be taken into account. Since delta electrons contribute to the initiation of radiation damage for all kinds of ionizing radiation, the interaction pattern of electrons at energies up to few keV is of particular importance, including their ability of forming ionization clusters. In view of this fact, it is the aim of the present paper (i) to describe the first experimental data on the distribution of ionisation cluster size produced by low energy electrons in a target cylinder of nitrogen, 3.5 nm in diameter at unit density, which is equivalent to about 2 nm in liquid water, and (ii) to present cluster-size distributions calculated by Monte Carlo simulation. In the experiment, nanometric targets were simulated in the so-called Jet-Counter. It consists of a pulse-operated valve which injects an expanding jet of nitrogen into an interaction chamber where a cylindrical sensitive volume is created. This sensitive volume was irradiated by electrons at 200 eV, 300 eV, 500 eV and 1 keV emitted by an electron gun. The distribution of ionization cluster size was measured using the single-ion-counting method and compared with the results of the Monte Carlo simulation. |
