Figure 2.

Absorbed-dose energy dependence of EBT film for photon energies from 3 keV to 18 MeV as well as the mass energy absorption coefficient ratio and restricted stopping power ratio of water to the EBT active material. Also included is the absorbed-dose energy dependence at 10 and 50 keV for a hypothetical film where the only film layers that are not water are the active layers (only active) and a hypothetical film that is normal except that the active layers are made of water (no active). The uncertainties for “only active” and “no active” are smaller than the symbols.