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

[ratilal.meher]

Facing an issue with setting up NaI detector in my geometry

[bmorgan]

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

[ratilal.meher]

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”

MyPhysicsList::MyPhysicsList()
{
RegisterPhysics (new G4EmStandardPhysics());
RegisterPhysics (new G4OpticalPhysics());
RegisterPhysics(new G4DecayPhysics());
RegisterPhysics(new G4RadioactiveDecayPhysics());
}

MyPhysicsList::~MyPhysicsList()
{}
Is it correct for the above source and detector?

[bmorgan]

That should be o.k., yes.

[ratilal.meher]

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

[bmorgan]

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

[Ratilal0106]

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

[bmorgan]

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