How to compare spectra with simulated spectra?

I am simulating radioactive sources, I made a simulation of NaI detector. I recorded Edep spectra of particles.
I made a simulation with 1E7 particles in Geant, but in real life I took data of 0.25 uCi of activity during 45 minutes.
Someone who can explain how I can compare simulated spectra with experimental spectra.
I have this spectra of GEANT4, but I do not know how to scale and compare with experimental data.

Someone who can help I would thank a lot.