A study on the electronic stopping of protons in soft biological matter

Research output: Contribution to journalArticle

  • External authors:
  • D. Emfietzoglou
  • A. Pathak
  • G. Papamichael
  • S. Dhamodaran
  • N. Sathish
  • M. Moscovitch


The electronic stopping of protons in liquid water has been investigated by means of the dielectric function properties. Based on a modified Drude dielectric model, an accurate analytic parametrization of the two sets of available optical data for liquid water has been accomplished. The resultant optical loss functions predict an I-value of 80-85 eV. Extension to finite momentum is included by means of simple dispersion algorithms. The influence of different dielectric function approximations and of the higher-order Z 1-corrections to the stopping power (SP) of liquid water for protons in the 50-1000 keV range is explored. This includes the Bragg peak which, among other things, is of great interest in radiation dosimetry and in predicting radiation damage. The model calculations are within 10-12% of ICRU values with the larger deviations being observed below the SP maximum. The higher-order Z1-corrections, associated with the Barkas and Bloch effects, contribute minimally (

Bibliographical metadata

Original languageEnglish
Pages (from-to)55-60
Number of pages5
JournalNuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
Issue number1-2
Publication statusPublished - Jan 2006