Microdosimetric Aspects of 0.3- to 20-MeV Proton Tracks: I. Crossers

Wilson, W. E.; Metting, N. F.; Paretzke, H. G.

doi:10.2307/3577289

Cited by 29 publications

(10 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They can be explained by the fact that in nanometre-sized target volumes at larger impact parameters the cluster-size distributions are due to single δ-electrons the energies of which do not strongly depend on the average of the primary particles' velocity. Similar results were also obtained for much larger target volumes in the proportional-counter experiments mentioned above, for smaller target volumes by Bashkirov et al (2009), and in previous Monte Carlo simulations concerning the frequency of energy deposition events produced in small sites by high-energy δ-electrons (Kellerer and Chmelevsky 1975, Wilson et al 1988, Wilson 1994, Wilson and Paretzke 1994, Wang et al 2006. The results of these simulations show that, although the energy distribution of δ-electrons set in motion by primary particles depends on their velocity, the energy deposited by δ-electrons in small sites is relatively independent of the particles' velocity and of the impact parameter.…”

Section: Discussionsupporting

confidence: 87%

Track structure of light ions: experiments and simulations

et al. 2012

View full text Add to dashboard Cite

To study the track structure of light ions, a measuring device has been developed at the Legnaro National Laboratory of INFN, which can be used to investigate separately the penumbra region of particle tracks and the trackcore region, which is a few nanometres in diameter. The device is based on single-electron counting techniques by means of a gas detector; it simulates a 'nanometre-sized' biological volume of about 20 nm in diameter that can be moved with respect to a narrow particle beam to measure the ionizationcluster-size distributions caused within the target volume by the passage of single primary particles, as a function of the impact parameter. To investigate the ionization-cluster-size formation caused by primary particles of medical interest when they penetrate through or pass by the target volume at a specified impact parameter, measurements and Monte Carlo simulations were performed for 20 MeV protons, 16 MeV deuterons, 48 MeV 6 Li-ions, 26.7 MeV 7 Li-ions and 96 MeV 12 C-ions. The detailed analysis of the resulting distributions showed that in the track-core region their shape is mainly determined by the mean free ionization path length of the primary particles, whereas in the penumbra region the shape of the distributions is almost independent of the impact parameter, and also of the particle type and velocity.

show abstract

Section: Discussionsupporting

confidence: 87%

Track structure of light ions: experiments and simulations

et al. 2012

View full text Add to dashboard Cite

show abstract

“…The significant difference from our plots is due to the underestimation, found above, of in [10] for large radial distances. On the other hand our results agree with the Monte Carlo simulations of [36] for protons crossing water spheres. The small systematic shift of to higher values in [36] can be attributed to the somewhat larger ranges of the -electron in water and to the spherical shape of the nanometric volume used there while our is for a cylinder.…”

Section: Spatial Track Structuresupporting

confidence: 90%

“…It was obtained by averaging over several thousands of proton trajectories. This might not be a good way to describe the energy deposition by a single ion, for which calculations of the so called microdosimetric event-size distributions were presented in [35], [36]. Yet, well characterizes the energy deposition in silicon, with dimensions larger than 50 nm, by single protons with…”

Section: Spatial Track Structurementioning

confidence: 99%

Ion-track structure and its effects in small size volumes of silicon

Akkerman

Barak

2002

IEEE Trans. Nucl. Sci.

View full text Add to dashboard Cite

A model for ion-energy deposition in silicon, based on experimental data of the optical energy loss function, is presented. The model yields the characteristics of ion-and electron-interactions in silicon. Monte Carlo transport calculations based on this model give the energy distribution and its moments including a full and consistent description of the spatial ion track structure. The model was used for estimating the influence of the track structure on energy deposition in submicron devices and on the shape of the single event upsets (SEUs) cross-section curves.Index Terms-Dielectric response theory, dose radial distribution, energy deposition in nanometer volumes, inelastic atomic ion scattering, straggling.

show abstract

“…We have done this, usinga detailed-histories,MonteCarlo methodfor electron transport (slowing down of _!ectronsisfollowedby computingevery elasticand inelasticinteraction) (Paretzke 1987;Wilson et al, 1988); the Vavilovdistributionis not used. lt is not computationally tractable to compute in the MeV electron energy rangewith detailed histories,however.…”

mentioning

confidence: 99%