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I'm using Geant4 to simulate a titanium prosthesis in a human leg. The results I'm getting seem to be relatively dependent on the cut in range I'm using. Is there a rule of thumb of what that cut should be depending on the dimensions of the sensitive volumes for instance?
I expect a rise in the energy deposit before the prosthesis (irradiated with photons). If I use a cut of 0.1mm I miss that rise. I have to go down to 0.0001mm to see that rise. This correponds to an energy threshold of 1keV for all the material I'm using. For comparison, the prosthesis was simulated with MCNP which sees that rise using an energy cutoff of 100keV, therefore reducing considerably the simulation time. Any idea why I have to go down to so low values?
Is there a way to specify a different cut in range for a group of volumes or materials? That would speed up the simulation quite a lot.
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