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Radiation Protection Dosimetry Advance Access originally published online on June 1, 2007
Radiation Protection Dosimetry 2007 126(1-4):467-470; doi:10.1093/rpd/ncm094
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Proton-induced frequency distributions of ionization cluster size in propane

G. Hilgers1,*, E. Gargioni1, B. Grosswendt1 and S. Shchemelinin2

1 Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
2 Weizmann Institute of Science, 76100 Rehovot, Israel

* Corresponding author: gerhard.hilgers{at}ptb.de

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.


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