I am trying to implement a crystalline compound with a percentage of impurity (1000 ppm) for a LiF(Mn) dosimeter. I was studying in detail the example for creating solid crystals that appears in Geant4, which is channeling.
My question is.
How to associate a percentage of impurity?
Is it necessary to make two unit cells?
Or just by creating the molecular composition Geant4 already places the impurity with its respective percentage in some unit cells?