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Off‐axis beam quality change in linear accelerator x‐ray beams
Author(s) -
Hanson W. F.,
Berkley L. W.,
Peterson M.
Publication year - 1980
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.594677
Subject(s) - linear particle accelerator , laser beam quality , beam (structure) , optics , particle accelerator , materials science , transmittance , physics , laser , laser beams
The effective energy of the x‐ray beam from linear accelerators changes as a function of the position in the beam due to nonuniform filtration by the flattening filter. In this work, the transmittance through a water column was measured in good geometry and the beam quality characterized in units of HVL in water. Measurements were made on a variety of linear accelerators from 4 to 10 MV. The beam energy decreased with increasing distance from the central ray for all accelerators measured.