At a phantom depth of 10 cm, on the central axis, scatter contribution to the dose is more for a Co-60 beam than an accelerator beam.
This is because scatter towards the central axis decreases as the beam quality increases; hence the decrease in the field size dependence for higher energy photon beams.
SUMMARIZED
At any given depth, the scatter contribution to the total dose decreases with an increase in incident photon energy.
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