Abstract
The dosimetic properties of interest in a megavoltage therapy X-ray beam are per cent depth dose, skin sparing, penumbra, radiation field flatness and symmetry. The 10 MV X-ray beam from the Varian Associates Clinac 18 Linear Accelerator is studied with regard to these points. The primary points of interest are a 50% depth dose for a 10 × 10 cm 2 field at 18.0 cm in water and a depth of maximum dose of 2.4 ± 0.1 cm in water. Transmission measurements in aluminum and lead yielded 50% transmission thicknesses of 73.2 and 13.4 mm respectively. The flatness of the fields are parametrized as function of field size and depth. Decrement line plots are graphed and isodose curves for selected field sizes are presented.
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