Source of Support: None, Conflict of Interest: None
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Depth dose measurements were performed using a p-type semiconductor detector in water at nominal electron energies of 6,9,12, 16 and 20 MeV for the standard available square field sizes. The range and energy parameters were derived from the central axis depth dose measurements. The virtual SSD and the penumbra were measured from dose profiles obtained in planes perpendicular to the beam central axis in water.