Despite the importance of photoneutrons doses
produced in the high-energy linear accelerators, currently
they are not considered in the treatment planning systems.
Therefore, it is necessary to characterize the photoneutrons
produced around the linacs. For this purpose, the main
components of head of 15 MV Siemens Primus were
simulated using MCNPX 2.6. Neutron contamination was
calculated in the treatment room at the isocenter. The
maximum dose equivalent of neutrons was found in
25 cm 9 25 cm field size. Neutron spectrum was also
measured applying the Bonner sphere with gold foils and
artificial neural network as unfolding method.
کلید واژگان :
Neutron contamination Bonner sphere spectrometry High-energy linac Monte Carlo
