Modeling of the Sarad EQF 3600 detector

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_Geant4 Version:4.11.1
_Operating System:ubuntu 23

hello, I would like to modeling the Sarad EQF 3600 detector with geant 4 in order to detect radon and its descendants but I am new to geant 4.
I would like to have any leads that would allow me to design it.
Thank you Best regards

The best thing to do is to start with the Application Developer’s Guide, and work through the Getting Started chapter and the use of the “basic B1” example. That’ll introduce the basic concepts and get an application running.

Once that’s familiar, the next thing to focus on would be building the geometry of the detector in the DetectorConstruction using the relevant geometry solids and materials.