document: Benchmarking of the Dose Planning Method -LRB- DPM -RRB- Monte Carlo code using electron beams from a racetrack microtron A comprehensive set of measurements and calculations has been conducted to investigate the accuracy of the Dose Planning Method -LRB- DPM -RRB- Monte Carlo code for dose calculations from 10 and 50 MeV scanned electron beams produced from a racetrack microtron . Central axis depth dose measurements and a series of profile scans at various depths were acquired in a water phantom using a Scanditronix type RK ion chamber . Source spatial distributions for the Monte Carlo calculations were reconstructed from in-air ion chamber measurements carried out across the two-dimensional beam profile at 100 cm downstream from the source . The in-air spatial distributions were found to have full width at half maximum of 4.7 and 1.3 cm , at 100 cm from the source , for the 10 and 50 MeV beams , respectively . Energy spectra for the 10 and 50 MeV beams were determined by simulating the components of the microtron treatment head using the code MCNP4B . DPM calculations are on average within + or-2 % agreement with measurement for all depth dose and profile comparisons conducted in this study . The accuracy of the DPM code illustrated in this work suggests that DPM may be used as a valuable tool for electron beam dose calculations
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extractive_keyphrases: scanned electron beams racetrack microtron benchmarking central axis depth dose measurements profile scans water phantom ion chamber source spatial distributions mcnp4b electron beam dose calculations 50 mev
abstractive_keyphrases: dose planning method monte carlo code two-dimensional beam profile in-air spatial distributions radiotherapy treatment planning electron transport scoring parameters 10 mev