In this paper, the computer simulation using the Geant4 software package examines the contribution of photonuclear reactions products to the absorbed dose. The absorbed dose is determined along the central axis of the beam in an aqueous phantom upon irradiation with both monochromatic photons with energy above the threshold of photonuclear reactions and bremsstrahlung. It is shown that in spite of the smaller cross section of photoproton and photoneutron reactions relatively to other channels, the main contribution among all products is produced by alpha particles. The lower estimate of the total contribution of all products is about 5% for bremsstrahlung photons with a maximum energy of 20-30 MeV.
$^1$Department of Accelerator Physics and Radiation Medicine , Faculty of Physics, Moscow State University\
$^2$Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics, Moskow 119991, Russia.
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