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In (a) the Monte Carlo derived phase function, P(z, θ), for Čerenkov emission from a 4 × 4, 10 × 10, and 20 × 20 cm2 6 MV beam at depths of z = dmax, 10, 20, 30, and 40 cm. In (b) the normalized phase functions from (a) in comparison to the normalized phase function in the buildup region at z = 0.2 cm for all three field sizes is plotted.
