Physics Bucharest 2017

Dose Deposition Kernel Low Energy

 Low energy : electron range much shorter than photon mean free path  Small primary dose region (short BU distance and steep penumbra)

 Wide scatter dose region (high dose outside field)  Isotropic isolevels (large amount of backscatter)

From: A. Ahnesjö and M.M. Aspradakis, Dose calculations for external photon beams in radiotherapy. Phys Med Biol 44 (1999), pp. R99–R155.