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Question Problem in Scintillation Simulation with Nonlinear Light Yield  

Forum: Processes Involving Optical Photons
Date: 28 Dec, 2011
From: Xing Zhang <Xing Zhang>

Hi, everyone:

Recently I meet a problem in scintillation simulation with nonlinear light yield by Geant4.9.4. What I want to do is the 14MeV neutron response in a BC501A or EJ301 scintillator. I have added the nonlinear light yield properties of proton and alpha in the detectorconstruction.

I found that when proton energy exceeded 5.5 MeV, the proton would deposit its energy in many steps by ionization process. For example, the below list the track information of a 9.13 MeV proton. The light yield in every step is calculated with the deposition energy in every step. But due to the nonlinear light yield, the sum of the light yield in all steps is much less than the light yield from a 9.13 MeV proton. So is there any technique to make the light yield be calculated according to the energy of proton at the beginning in a track while not the deposition energy in every step?

*******************************************************************************
* G4Track Information:   Particle = proton,   Track ID = 2,   Parent ID = 1
*******************************************************************************

Step#    X(mm)    Y(mm)    Z(mm) KinE(MeV)  dE(MeV) StepLeng TrackLeng  NextVolume ProcName
    0    -7.63    -9.21 2.81e+03      9.13        0        0         0 Scintilator initStep
    1    -7.64    -9.21 2.81e+03      9.07   0.0434   0.0106    0.0106 Scintilator hIoni
    2    -7.65    -9.22 2.81e+03      8.96   0.0922   0.0197    0.0303 Scintilator hIoni
    3    -7.73    -9.24 2.81e+03      8.47    0.482    0.115     0.145 Scintilator hIoni
    4    -7.73    -9.24 2.81e+03      8.44     0.01  0.00233     0.147 Scintilator hIoni
    5     -7.8    -9.26 2.81e+03      8.01    0.414      0.1     0.247 Scintilator hIoni
    6     -7.8    -9.26 2.81e+03      7.98   0.0204  0.00493     0.252 Scintilator hIoni
    7    -7.93     -9.3 2.81e+03      7.08    0.887    0.189     0.441 Scintilator hIoni
    8    -7.94     -9.3 2.81e+03      7.01   0.0567  0.00991     0.451 Scintilator hIoni
    9    -7.95    -9.31 2.81e+03      6.91   0.0817   0.0153     0.466 Scintilator hIoni
   10       -8    -9.32 2.81e+03      6.48    0.418   0.0762     0.543 Scintilator hIoni
   11    -8.03    -9.33 2.81e+03      6.23    0.237   0.0402     0.583 Scintilator hIoni
   12    -8.11    -9.35 2.81e+03      5.48    0.757    0.122     0.705 Scintilator hIoni
   13    -8.44    -9.44 2.81e+03         0     5.48     0.47      1.17 Scintilator hIoni

Thanks a lot to everyone! Happy New Year to everyone!

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