PhoNeS (Photo Neutron Source) is an INFN (Italian National Institute for Nuclear Physics) project devoted to the optimization of the neutron production and moderation in radiotherapy linear accelerators. LinAc's producing high energy (15 to 25 MeV) photon beams are becoming widespread. At this energy neutron photoproduction is unavoidable and the neutron dose must be controlled and reduced during normal radiotherapy. A technique known as BNCT (Boron Neutron Capture Therapy) uses neutrons for radiotherapic treatments: the cells are given a drug containing 10B which undergoes fission after neutron capture, inducing heavy damages to the DNA of the cell itself. This website will describe the moderator developed by PhoNeS and the results in terms of neutron flux and spectrum and photon contamination of the measurements performed on several radiotherapy accelerators.
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