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Measured and calculated (BEAMnrc default parameters∕techniques) central-axis dose profiles in a water phantom for the 10×10 and 40×40 cm2 field sizes. The calculations were performed with an average fractional uncertainty in the dose [for voxels with dose values greater than 50% of the maximum dose (Ref. 36)] of less than 0.01 (1%). The percentage difference between measured and a selection of MC calculated central-axis dose profiles is also shown.
