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Calibration of film for accurate megavoltage photon dosimetry
J I Hale1, A T Kerr, P C Shragge
1Queen's University, Department of Physics, Kingston, Ontario, Canada.
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.