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Question Obtaining Gamma Spectrum from Neutrons as a primary 

Forum: Biasing and Scoring
Date: Nov 16, 11:27
From: Sanchit Sharma <Sanchit Sharma>

Hello, I am a new user of Geant4 and will be very grateful for your reply. I have modeled my Active Neutron Interrogation experimental facility(room) and have placed NaI detectors in it. I have a 14.1 MeV neutron source modeled by a General Particle Source. And I am using QGSP_BERT_HP.hh physics for the simulations. 

My aim is to obtain secondary gamma cell flux spectra and gamma energy deposited spectra with energy binning in both cases. As I am fairly new to the Geant4 and C++ world. I would immensely appreciate some guidance from experts on how to accomplish this with ease. 

Also, please let me know how to start leaning about scoring in Geant. 

For my NaI detector, I have registered it as a MultiFunctional detector as shown below:

// Setting NaI FAR as a detector
//  
auto NAIFDetector = new G4MultiFunctionalDetector("NaI-FAR");
G4SDManager::GetSDMpointer()->AddNewDetector(NAIFDetector);

G4VPrimitiveScorer* primitive1;
primitive1 = new G4PSEnergyDeposit("EdepF");
auto particle3 = new G4SDParticleFilter("particle1FilterF");
particle3->add("gamma");
primitive1 ->SetFilter(particle3);
NAIFDetector->RegisterPrimitive(primitive1);

primitive1 = new G4PSTrackLength("TrackLengthF");
auto particle4 = new G4SDParticleFilter("particle2FilterF");
particle4->add("gamma");
primitive1 ->SetFilter(particle4);
NAIFDetector->RegisterPrimitive(primitive1);  

primitive1 = new G4PSCellFlux("CFluxF");
auto particle5 = new G4SDParticleFilter("particle3Filter");
particle5->add("gamma");
primitive1 ->SetFilter(particle5);
NAIFDetector->RegisterPrimitive(primitive1);

SetSensitiveDetector("NaI_FarLV",NAIFDetector);


Thanks very much!


  

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