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Radiation Protection Dosimetry Advance Access originally published online on January 24, 2007
Radiation Protection Dosimetry 2006 122(1-4):82-85; doi:10.1093/rpd/ncl406
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Formation of ion clusters by low-energy electrons in nanometric targets: experiment and Monte Carlo simulation

A. Bantsar1,*, B. Grosswendt2 and S. Pszona1

1 Soltan Institute for Nuclear Studies, 05-400 Otwock-Swierk, Poland
2 Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany

* Corresponding author: pszona{at}ipj.gov.pl


  Abstract

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 ~2 nm in liquid water are presented. 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 300 eV, 500 eV and 1 keV, emitted by an electron gun. The distribution of ionisation cluster size was measured using the single-ion-counting method and compared with the results of Monte Carlo simulation.


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