Dear David,
thank you for your answer.
Yes, my sources have different activities, so it would be useful to implement isotope switching and their activities in the source routine. The important thing form me is to obtain an unique final spectrum which is the sum of each isotope contribution.
I am using the modified source routine
source_volume.f (9.8 KB)
which you suggested in the following discussion
Volumetric source of complex geometry
to simulate a volume source in marinelli beaker.
Could you tell me how to modify routine source to obtain what you said?
Cheers
Corrado