title: The influence of target thickness and backstop material on proton-produced neutron beams for radiotherapy.
abstract: Results are presented of measurements of skin sparing, penetration and total dose per unit of incident charge for various target thicknesses and filtrations for a neutron beam generated by 42 MeV protons on beryllium. These results are contrasted to predictions outlined in a previous paper. The differences from these predictions are attributed to the contribution of low-energy neutrons produced by the residual proton beam in the thick copper target backstop.
mesh_terms: D000201:Activation Analysis; D001608:Beryllium; D006801:Humans; D009501:Neutron Activation Analysis; D011522:Protons; D011878:Radiotherapy / Q000379:methods*; D011879:Radiotherapy Dosage
chemical_list: D011522:Protons; D001608:Beryllium