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Xstrahl SARRP spectra for the 220-kVp beam used in absolute dose computation using the EGSnrc MC code package. Depicted are spectra ranging from no added filtration (top curve) to a 0.3 mm Cu filter (bottom curve) in 0.05 mm Cu increments. The spectrum with no added filtration cuts off at a minimum energy of 10 keV due to cut-off energy limitations and is shown for illustrative purposes only.
