Absorbed dose distribution of the secondary electrons near an X-ray microbeam

摘要

Dose distributions of the secondary electrons were calculated by Monte Carlo code EGS4 in water near an infinitesimal area photon microbeam. The photon energy was from 10 to 100 keV, the radial resolution was 2 μm and the statistical error (standard deviation) was from 0.1 to 1-2% depending on the calculation point. The Compton recoil electron and photoelectron dose fractions were separated from the dose profiles and fitted by simple analytical functions.