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None Why the energy depositions of different SCINTILLATIONYIELD are different 

Forum: Processes Involving Optical Photons
Date: 12 Jun, 2015
From: Wang Qi <Wang Qi>

Hello,

I am simulating an x-ray detector. The incident x-ray energy is 30keV. There is a scintillator. The thickness is 5um. The scintillator is devided into a lot of small cubes. After /run/beamOn 3e6, I draw the energy deposition along its direction of thickness. I find that the results of SCINTILLATIONYIELD=0./MeV and 26000./MeV are not the same. The energy deposition curve of SCINTILLATIONYIELD=0./MeV is higher than the other one. I do not understand why.

I calculate the number of different processes. Left is SCINTILLATIONYIELD=0./MeV, right is SCINTILLATIONYIELD=26000./MeV Total energy deposition(75.789GeV,60.122GeV), Rayl(171672,164252), phot(2992043,2838807), compt(39177,36176), Scintillation(41305895,31567245), eIoni(76873904,60274751), eBrem(33467,26332), msc(1620826,1063048), CoupledTransportation(8046237,1469901405), StepLimiter(46754968,11310279).

For SCINTILLATIONYIELD=26000./MeV, there is an absorption, only 192 optical photons. The energy of the optical photons is 2.95eV. So I think the difference is not from this.

For the optical process, I have a bounce limit. counterBounce represents the number of FresnelReflection. When the status is TotalInternalReflection, if counterBounce is more than bounce limit, kill this optical photon.

I simulate with differnt bounce limit(20,60,100). I find if the bounce limit increases, the result of SCINTILLATIONYIELD=26000./MeV will be closer to the result of SCINTILLATIONYIELD=0./MeV.

I have been thinking this question for almost one month. Help me please.

Thank you,

Hellcat

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