Electron and x-ray beam characteristics of the linac LMR-13.

Electron beams of nominal energies 4, 8, 10 and 12 MeV were investigated. The effect of Ni and Pb scattering foils on beam penetration and field flatness is discussed and optimal combinations of beam energies and scattering foils are suggested. Depth doses are expressed as percentiles. A study of the 10 MV x-ray beam shows a need for two flattening filters for clinical ranges of field sizes. Flatness and depth dose data variations for two lead flattening filters of the same maximum thickness and central axis percentage depth doses are given.