Geant4 low energy validation Jean-Francois Carrier, Louis Archambault, Rene Roy and Luc Beaulieu Service de radio-oncologie, Hotel-Dieu de Quebec, Quebec, Canada Departement de physique, Universite Laval, Quebec, Canada The following results will be published soon. They are part of a general Geant4 low energy validation project.

Using Geant4, we calculated depth-dose curves for many different electron or photon sources: Beams monoenergetic beam realistic clinical accelerator beam Point sources monoenergetic source source with real nuclide energy spectra and different irradiated media: Homogeneous water, Be, Mo or U Heterogeneous water/Al/lung/water water/air/steel/air/water

Uranium irradiated by electron beam Fig 1. Depth-dose curve for a semi-infinite uranium slab irradiated by a 0.5 MeV broad parallel electron beam 1 Chibani O and Li X A, Med. Phys. 29 (5), May 2002

Multi-slab medium irradiated by photons Fig 2. Depth-dose curve for a multi-slab medium irradiated by a 18 MV realistic clinical accelerator photon beam 2 Rogers D W O and Mohan R,

Water phantom irradiated by clinac beam Fig 3. Relative dose distribution for a water phantom irradiated by a 6 MeV Clinac 2100C electron beam 3 Ding G X and Rogers D W O

Multi-slab medium irradiated by photons Fig 4. Depth-dose curve for a multi-slab medium irradiated by a 10 MV monoenergetic photon beam 4 Chibani O and Li X A, Med. Phys. 29 (5), May 2002