Hi Geant4 users,
I want to build source which consists of many small source, for example ECT and PET image. They may have different intensity and particle in each voxel.
The number of voxel may be 1e6 or more. When I use “/gps/source/add” in mac file to define the source, this takes a long time to complete and will result in an error.
Is there any methods to define voxel source?