The role of electron capture and energy exchange of positively charged particles passing through matter

Details The role of electron capture and energy exchange of positively charged particles passing through matter The role of electron capture and energy exchange of positively charged particles passing through matter

2011-09-12

arxiv.org/abs/1109.2509v1

Physics

Medical Physics

Preprint

Scientific paper

The conventional treatment of the Bethe-Bloch equation for protons accounts for electron capture at the end of the projectile track by the small Barkas correction. This is only a possible way for protons, whereas for light and heavier charged nuclei the exchange of energy and charge along the track has to be accounted for by regarding the projectile charge q as a function of the residual energy. This leads to a significant modification of the Bethe-Bloch equation, otherwise the range in a medium is incorrectly determined. The LET in the Bragg peak domain and distal end is significantly influenced by the electron capture. A rather significant result is that in the domain of the Bragg peak the superiority of carbon ions is reduced compared to protons.

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