title: Calibration of film for accurate megavoltage photon dosimetry.
abstract: An accurate method of converting film density to dose is presented. For films oriented parallel to the beam's central axis, calibration curves were produced at several depths using Kodak XV-2 film for cobalt-60, 4 MV, and 18 MV beams. Then the appropriate curve was employed to convert the film density to dose at a specific depth. It is hypothesized that the change in film response with depth is due to changes in the photon spectra at depth in a phantom.
authors.affiliation: Queen's University, Department of Physics, Kingston, Ontario, Canada.
authors.forename: J I
authors.initials: JI
authors.lastname: Hale
authors.forename: A T
authors.initials: AT
authors.lastname: Kerr
authors.forename: P C
authors.initials: PC
authors.lastname: Shragge
mesh_terms: D002138:Calibration; D005373:Film Dosimetry / Q000592:standards*; D017785:Photons