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Forum: Event and Track Management
Re: Question Production Thresholds (Matt)
Date: 14 Feb, 2014
From: Daren Sawkey <Daren Sawkey>

Hi,

> 1.) Am I setting the production thresholds
> correctly?

I think this is correct, to set a production threshold of 100 MeV for every material. Example $G4INSTALL/examples/extended/electromagnetic/TestEm8 gives an example of this.

> 2.) If so, why are there still secondary photons that have energy below
> the threshold? Is Bremsstrahlung omitted from the thresholds?

By default particles are tracked until they have zero energy. The cuts set the minimum energy with which a particle will be produced. You'll still see particles with energy below the threshold.

> 3.) Can you offer any advice if I want to reproduce the geant3 energy
> threshold cuts? I have also tried G4UserLimits and G4UserSpecialCuts and
> what I found is that the particles don't actually *stop* being tracked
> (which is what I had hoped would happen).

One way to stop tracking particles once they reach a certain energy is to use a special tracking cut (see section 5.4.7 in the Application Developer Manual).

  --  Daren.

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