title: Radiation beam characteristics of a 22 MeV microtron.
abstract: The properties of the electron and photon beams from a 22 MeV clinical microton are presented. Favourable isodose distributions for radiation therapy are obtained for both modalities. For the electron beam this is accomplished using a dual scattering foil system in which the secondary foil is shaped to optimize uniformity and minimize energy loss and energy straggling. The photon beam is flattened by a composite filter to produce dose distributions of high uniformity over a wide depth interval.
mesh_terms: D004583:Electrons; D008433:Mathematics; D008954:Models, Biological; D011839:Radiation, Ionizing; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy