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Forum: Processes Involving Optical Photons
Re: Question Need explanation on Material Properties Table (Clarisse)
Date: 27 Feb, 2009
From: Gumplinger Peter <Gumplinger Peter>

Clarisse,

>I see a table of 32 optical photon energies, but, I do not see a table showing

>the corresponding "relative strength" for those photons, in order to define

>their actual distribution or emission spectrum.

  G4double ScintilFast[nEntries] =
            { 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00,
              1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00,
              1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00,
              1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00,
              1.00, 1.00, 1.00, 1.00 };
  G4double ScintilSlow[nEntries] =
            { 0.01, 1.00, 2.00, 3.00, 4.00, 5.00, 6.00,
              7.00, 8.00, 9.00, 8.00, 7.00, 6.00, 4.00,
              3.00, 2.00, 1.00, 0.01, 1.00, 2.00, 3.00,
              4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 8.00,
              7.00, 6.00, 5.00, 4.00 };

  myMPT1->AddProperty("FASTCOMPONENT",PhotonEnergy, ScintilFast,     nEntries);
  myMPT1->AddProperty("SLOWCOMPONENT",PhotonEnergy, ScintilSlow,     nEntries);

>HOW DO YOU ACTUALLY DESCIBE THE DISTRIBUTION OF THE EMITTED OPTICAL PHOTONS

>IN GEANT4????

Please, see also

Example 5.5. Specification of scintillation properties in DetectorConstruction.

in the Application Developers Guide (http://geant4.web.cern.ch/geant4/UserDocumentation/UsersGuides/ForApplicationDeveloper/html/ch05s02.html#sect.PhysProc.Photo)

You can specify the intensity spectrum at as many points (photon energies) as you require for your spectrum (in example06 there are 32 points).

>I guess I can set both the FASTTIMECONSTANT, and the SLOWTIMECONSTANT to 250 ns

>there.

For scintillators with only one emmission spectrum use either (or) FAST/SLOW.

The actual numbers/values for the intensity spectrum in example06 are purely invented. See also examples/extended/optical/LXe

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