Figure 8.

Profile comparison between the EDR film and the IC‐10 ionization chamber in heterogeneous full‐slab lung geometry for $2\times 2{ \text{cm}}^2$ and $10\times 10{ \text{cm}}^2$ fields at depth of 8 cm (in the lung) and 12 cm (beyond the lung). Profiles are shown for (a) 6 MV and (b) 15 MV photon beams. Profiles are normalized to their respective central axes. The IC‐10 profiles are subsequently rescaled to the central axis value of the EDR profiles for a given field size and energy.