Abstract
Electron disequilibrium affects dosimetry in the megavoltage range and occurs at the entrance and exit of a beam entering a volume and within that volume for beam sizes significantly smaller than the mean electron range. Monte Carlo (MC) codes can be used to determine changes in the electron spectra in these circumstances. This information can be used in support of detector corrections for high-resolution radiation therapies including radiosurgery, intensity-modulated radiotherapy and in the comparison and matching of electron spectra in radiobiology experiments (Pattison et al., 2001). An example of the utility of the method is in the application of Bragg–Gray cavity theory to solidstate detectors for use in megavoltage X-ray dosimetry. In this case care has been taken to separate low-energy electrons generated from the scattered photons from high-energy electron contributions (Yin et al., 2002). This work shows that such detectors are still useable in regions in which disequilibrium occurs as long as perturbations to the spectra are minimal.
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