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Proton Pencil-beam Dose Calculation Using a Semi-infinite Multiple-slab Model

Kiyoshi Yoda
Journal / Anthology

Journal of the Japanese Society for Therapeutic Radiology and Oncology
Year: 1997
Volume: 9
Issue: 2
Page range: 86-92

A simple formula has been derived for calculating root mean square (rms) radius of a proton pencil beam inside a body, where the body is approximated by a parallel, multiple-slab model. The derived rms radius expression was based on Brahme's formulation and Scott's approximation, while it eventually agrees with a special case resulting from Lax and Brahme's formulas for a multiple-slab model. A depth dose model was also constructed, taking into account the energy loss of protons, the range straggling, the momentum spread of the proton beams, and the flux reduction and local dose distributions were compared with previously reported experimental data, showing reasonable agreement between them.

*Science > Medicine
*Science > Physics > Nuclear and Particle Physics