Defining components in a geometry imported GDML file

I’m working on a Windows machine, I would like to ask you how can I
define a radioactive source volume as a source of particles and a detector with a geometry imported in a GDML file, since it is constructed by FreeCAD.

Thanks a lot for your help.

I think you can take help from the link given in this question.

it is also doing same that how one can import a geometry in Geant4 that is made by FreeCAD and also you can take help from
I think it can help you.

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