Abstract
We report on radial dose distributions D(r) for carbon ions calculated with Geant4-DNA code. These distributions characterize ion tracks on a nanoscale and are important for understanding the biological effects of ion beams. We present data for carbon ion beams in the energy range from 20 to 400 MeVu-1. To approximate the Monte Carlo results, we developed a simple formula that combines the well-known inverse square distance dependence with a factor correcting D(r) for small r . The proposed formula can be used to calculate D(r) for any energy within the above range and for distances r from 1 nm to 2 μm with a maximum error not exceeding 14%. This range of distances corresponds to a dose range of over seven orders of magnitude. Differences between our results and those of previously published analytical models are discussed.
Original language | English (US) |
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Pages (from-to) | N219-N227 |
Journal | Physics in medicine and biology |
Volume | 62 |
Issue number | 10 |
DOIs | |
State | Published - Apr 20 2017 |
Keywords
- amorphous track model
- carbon ion beam therapy
- hadron therapy
- local effect model
- track structure
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging