default cut value for thin absorber

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I'm trying to simulate isotropic 60 keV gamma-lay emission inside 4pi gold absorber. The thickness of the gold foil is 1 X 2 um ~ 60 X 2 um. At first, I set the default cut value to 20 um. I just modified a program from my colleague, so I had no idea of proper cut value. Meanwhile I came to think that when the gold absorber is as thin as 20 um or thinner than that, the cut value of 20 um might not be appropriate. Now I changed it into 1 um. However, I still have no idea of proper value for my simulation. Could you please give me some hint?

Geant4 version : 4.9.1 CLHEP version : 1.9.2.1

  defaultCutValue = 0.001*mm;
  cutForGamma     = defaultCutValue;
  cutForElectron  = defaultCutValue;
  cutForPositron  = defaultCutValue;