Calibration of film for accurate megavoltage photon dosimetry.
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.
Hale
J I
JI
Queen's University, Department of Physics, Kingston, Ontario, Canada.
Kerr
A T
AT
Shragge
P C
PC
D002138:Calibration; D005373:Film Dosimetry / Q000592:standards*; D017785:Photons