The two films are different in their response to dose:
XV films being to saturate at about 30 cGy
EDR2 films begin to saturate at about 300 cGy
The difference between the two films originates from their differences in the content of silver bromide crystals and grain size.
The grain size of EDR2 is smaller.
DOSIMETRIC PERFORMANCE
Compared with XV film, EDR2 film showed better agreement with calculations and measurements of dose. (olch2002)
EDR 2 film is less sensitive to low energy photons.
XV requires less amount of dose and thus the irradiation will be much quicker. On the other hand it will saturate much quicker than EDR2 film.
Source Film dosimetry (Yeo and Kim)
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