2007
DOI: 10.1016/j.nimb.2007.09.039
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Ionization and excitation collision processes of electrons in liquid water

Abstract: This paper reports on Monte Carlo simulations of electrons in liquid water using a set of electron collision cross sections constructed with data published recently. The track history of electrons having initial energy ranged from 1keV to 10keV is investigated looking at the ionization and excitation processes. The results show that the ratio of the ionization and excitation events per track history is unique independent of the initial electron energy above a couple of hundred eV and these inelastic processes … Show more

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Cited by 34 publications
(30 citation statements)
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“…The local maximum is attributable largely to the clustering of ionization and excitation events. Ionization and excitation occur significantly with low energy electrons slowed down from 1 keV to 10 eV forming the clusters, independent of the initial energy [4,5]. Two neighboring events (of ionization and/or excitation) and succeeding radical formations in a few nanometers must be fundamental for causing double strand breaks (DSBs) of DNA since this distance scale is equivalent to the double helix local site.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…The local maximum is attributable largely to the clustering of ionization and excitation events. Ionization and excitation occur significantly with low energy electrons slowed down from 1 keV to 10 eV forming the clusters, independent of the initial energy [4,5]. Two neighboring events (of ionization and/or excitation) and succeeding radical formations in a few nanometers must be fundamental for causing double strand breaks (DSBs) of DNA since this distance scale is equivalent to the double helix local site.…”
Section: Resultsmentioning
confidence: 99%
“…Second, we made a Monte Carlo track simulation of the electrons produced in the photon interactions. The electron track was followed with an event-by-event algorithm using a set of electron collision cross sections for liquid water [5,6] and the scattering angle distribution for elastic and ionization collisions [7][8][9]. To reduce the computation time for vast amount data of ionization and excitation positions, a cyclic boundary condition for a cube voxel 100 m on a side was applied in this simulation.…”
Section: Simulation Model and Methodsmentioning
confidence: 99%
“…In fact, there are many ionization and excitation events in the vicinity of the track end [46]. This concentration of energy deposition around the track end should have a larger influence on the probability of inducing lesions in a cell nucleus than the other parts of the track.…”
Section: Discussionmentioning
confidence: 99%
“…We then applied WLTrack code (in-house code) [ 1 ] in order to calculate the energy deposition by electrons into a cell nucleus, in which the geometry is assumed as illustrated in Fig. 4 a.…”
Section: Methodsmentioning
confidence: 99%
“…When ionizing radiations such as X-rays and protons are incident on cultured cells (mainly composed of water), primary and secondary electrons are produced. Their energies are then deposited along the electron tracks through ionization and excitation processes [ 1 ]. The energy deposition may induce several kinds of DNA damage, such as base damage, DNA single-strand breaks (SSBs) and DNA double-strand breaks (DSBs) [ 2 5 ].…”
Section: Introductionmentioning
confidence: 99%