Dear G4 team,
The G4Material class has two methods to access:
-The mass fraction with
-The number of atom fraction with
I think I can use both these methods to get one of these quantities whatever the way I used to define my elements in the material (with a mass fraction or with a number of atoms).
However, the G4Element() has one method to access information on the isotopes. This method is
GetRelativeAbundanceVector(). It is not clear to me if this method returns a mass ratio or a number of atom ratio. Could you please clarify?