Physics List and the particle gun for the Cs-137 source want count gamma radiation flux using NaI detector

Facing an issue with setting up NaI detector in my geometry

Err, what exactly is the issue? We can’t help if you’re not specific and detailed about the problem you’re having.

First, I want to set up Physics for the Cs- 137 source with activity 100kBq detecting this gamma radiation in NaI scintillator detetector.

#include “physics.hh”

RegisterPhysics (new G4EmStandardPhysics());
RegisterPhysics (new G4OpticalPhysics());
RegisterPhysics(new G4DecayPhysics());
RegisterPhysics(new G4RadioactiveDecayPhysics());

Is it correct for the above source and detector?

That should be o.k., yes.

I’m using this source, how to decide the opening of the particle gun should fall on shield.

The visualisation of your setup in the OP shows particles being emitted from the source in what looks like a reasonable way already?

I want the photon count to be in the NaI scintillator detector and plot this in the geant4. How can I do that?

See the answer here: To measure the precise position of beam strike on the front and back chamber and the number of beams passed through the middle block - #4 by bmorgan

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