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Energy spectra and depth‐dose curves for 70 MeV protons
Author(s) -
Bichsel Hans,
Hiraoka T.
Publication year - 2009
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560360858
Subject(s) - spectral line , ionization , range (aeronautics) , scattering , atomic physics , deposition (geology) , energy (signal processing) , layer (electronics) , charged particle , materials science , chemistry , physics , ion , optics , paleontology , organic chemistry , quantum mechanics , astronomy , sediment , composite material , biology
In cancer therapy with fast charged particles, the energy deposition (“dose”) near the end of the range of the particles must be determined with an error of less than 2%. The dose is strongly influenced by straggling and multiple scattering effects. Calculations of straggling have been made in which spectra of protons with an initial energy of 70 MeV were obtained for successive layers of water. An average multiple scattering correction was made in each layer. The ionization in a thin gas layer as a function of absorber thickness was determined. It agrees quite well with measured ionization curves.