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Relative IDD data for Geant4 calculations adjusted to fit measurements with a Stingray chamber (a) before correction and (b) after correction. The red points represent the dose measurements. The solid, dashed, and dotted lines represent IDDtotal (IDD12C + IDDfrag), IDD12C, and IDDfrag respectively. The correction parameters in Eqs. (10) and (11) are λ = 170 mm (before correction) and λ’=150 mm (after correction).
