An empiric model to calculate electron dose distribution

Dose distributions in radiation fields are calculated for purposes of irradiation planning from measured depth dose and cross distributions predomenantly. Especially in electron fields the measuring effort is considerable, because these distributions have to be measured for all occurring irradiation parameters and in many different tissue depths. At the very least it can be shown for the 6-10 MeV electron radiation of the linear accelerator Neptun 10p that all the distributions required can be calculated from each separately measured depth dose and cross distribution. For this depth dose distribution and the measured border decrease of cross distribution are tabulated and the abscissas are submitted to a linear transformation x' = k · x. In case of depth dose distribution the transformation factor k is dependent on electron energy only and in cross distribution on tissue depth and source-to-surface distance additionally. (author)