Investigation of buildup dose from electron contamination of clinical photon beams

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Abstract
The contribution made by contaminating electrons present in a clinical [human cancer therapy] photon beam to the build-up dose in a polystyrene phantom was calculated and compared to measurements. A Monte Carlo technique was employed. The calculation was divided into 2 parts. The accelerator treatment head was simulated in detail. Information obtained from these calculations was used to compute dose curves in a polystyrene phantom. Two cases were considered, 1 in which both electrons and photons were incident on the phantom, and another in which electrons were eliminated from the incident beam. Results of these calculations agree with recent experimental findings. A decrease in build-up dose as well as a shift in dmax [the depth at which maximum dose is achieved] was observed when electrons were eliminated from the beam.

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