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Displacement correction Pdis

z_eff = 9.820 cm

zeff=z−0.6rcav(electrons, TG-51)z_{\mathrm{eff}}=z-0.6 r_{\mathrm{cav}}\quad\mathrm{(electrons,\ TG\text{-}51)}

Effective point of measurement: photons Pdis ≈ 1 − 0.4 r / d? TG-51 uses 0.6 r_cav upstream for electrons; photons use a gradient (Pgr) instead.

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