G4VPrimitive Scorer-Surface Current

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Hi.

I need to know the number of particles (gamma) entering my multifunctional detectors.

How do I use G4VPrimitive scorer to obtain such information?

Below is snippets of my code on how I register the G4VPrimitiveScorer and applying filter.

  G4SDManager* manager = G4SDManager::GetSDMpointer();
  G4String MFDname = "MyDetector";
  G4MultiFunctionalDetector* MFD = new G4MultiFunctionalDetector(MFDname);

  manager->AddNewDetector(MFD);
  logicHoles->SetSensitiveDetector(MFD);

  //filter
  G4String fltName, particleName;

  G4SDParticleFilter* gammafilter= new G4SDParticleFilter(fltName="gammaFilter",  particleName="gamma");

  G4PSEnergyDeposit* scorer = new G4PSEnergyDeposit("EnergyScorer");
  G4PSDoseDeposit* scorer1 = new G4PSDoseDeposit("DoseScorer");
  G4PSFlatSurfaceCurrent* scorer2 = new G4PSFlatSurfaceCurrent("Current", fCurrent_In);

  scorer2->SetFilter(gammafilter);

  MFD->RegisterPrimitive(scorer);
  MFD->RegisterPrimitive(scorer1);
  MFD->RegisterPrimitive(scorer2);

The program runs and give me results, but I am not sure if it gives me the number of gamma inside each detector.

Inputs and suggestion are highly appreciated.