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Question Re: Solving Discrepancies between Scintillation by/not by particle type 

Forum: Processes Involving Optical Photons
Re: Question Solving Discrepancies between Scintillation by/not by particle type (Andrew Hanson)
Date: 17 Jun, 2013
From: Zach Hartwig <Zach Hartwig>

Hi Andrew,

A few ideas/questions for you:

1. What version of Geant4 are you using?

I ask because ScintillationByParticleTypeMethod() must interpolate between the scintillation data points that you enter in the G4MaterialPropertiesTable in order to compute the scintillation yield for any energy deposited. When this method was first implemented a few years ago, the interpolation was handled very crudely, requiring the user to implement many data points to define their scintillation yield. Recent versions of Geant4 now use the more advanced interpolation methods found in the G4PhysicsOrderedFreeVector class (I can't remember when exactly the switch occured...maybe someone else can comment?) enabling better results with fewer data points.

2. What are the incident energies of your - I presume - neutrons? You should certainly ensure that you scintillation data points bracket your incident particle energy range.

3. How are you determining the photons/energy-deposited metric? I ask because the complexity of potential interactions of neutrons in NE213 can lead to a wide variety of scintillation light production on an event-by-event basis. For example, a recoil proton in a head-on neutron-hydrogen collision will produce far more light than a 12C(n,n)12C scattering event.

~Zach

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1 Feedback: Re: Solving Discrepancies between Scintillation by/not by particle type   (Gumplinger Peter - 17 Jun, 2013)
2 Ok: Re: Solving Discrepancies between Scintillation by/not by particle type   (Andrew Hanson - 18 Jun, 2013)
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