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Radiation Protection Dosimetry Advance Access originally published online on December 13, 2006
Radiation Protection Dosimetry 2006 122(1-4):116-120; doi:10.1093/rpd/ncl451
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Simulation of light ion induced DNA damage patterns

Werner Friedland1,*, Peter Jacob1, Herwig G. Paretzke1, Andrea Ottolenghi2, Francesca Ballarini2 and Marco Liotta2

1 GSF-Institute of Radiation Protection, Neuherberg, Germany
2 INFN and University Pavia, Italy

* Corresponding author: friedland{at}gsf.de


  Abstract

The biophysical simulation code PARTRAC was extended by a module to handle ions heavier than alpha particles. Cross sections for ion–electron interactions were taken from He++ ions of the same velocity and scaled by Zeff2/4. Calculated linear energy transfer values, radial dose distributions and secondary electron spectra were found in agreement with experimental results. DNA damage due to irradiation of human fibroblast cells by several light ions from H to S was calculated for various energies complemented by 220 kVp X rays as reference radiation. With increasing linear energy transfer, the calculated total yield of double-strand breaks per dose showed saturation behaviour at about twice the value for reference radiation. When data analysis methods for experimental double-strand break yield determination were applied to the simulated DNA damage patterns, the two data sets were found in accord. The calculated patterns of DNA damage clusters were analysed on local and regional scale finding regional clusters in closer correlation to experimental cell inactivation data.


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