Buildup region and skin‐dose measurements for the Therac 6 Linear Accelerator for radiation therapy

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Abstract
Buildup and surface‐dose measurements were taken for the 6 MV photon beam from a Therac 6 linear accelerator manufactured by Atomic Energy of Canada Limited (AECL) with and without a lucite blocking tray in place. Further measurements were made with a copper filter designed to reduce secondary electrons emitted by photon interactions with the Lucite tray. The results are discussed in relation to skin‐sparing for radiation therapy patients. The measurements were made with a fixed volume PTW parallel‐plate ionization chamber and corrected to zero‐chamber volume. The results were found to be consistent with similar measurements taken with a variable volume extrapolation chamber.
Funding Information
  • National Cancer Institute (CA06294, CA10953)

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