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Forum: Biasing and Scoring
Re: Question Scoring e- without scoring backscattered (Wal)
Date: 11 Mar, 2014
From: Daren Sawkey <Daren Sawkey>

 > I am thus wondering, what does the "depth" parameter stand for ?

This refers to the hierarchy of touchables, not a length.

> how can I
> count beta particles that goes through a volume without counting
> backscattered electron ?

You could use a G4PSFlatSurfaceCurrent at the back edge of the geometry. The geometry of the flat surface is one side of a G4Box, which is different from your cylinder. If you need a circular scorer you could modify G4PSCylinderSurfaceCurrent (which uses the inside surface of a cylinder) to use the end of the cylinder.

Also note that $G4INSTALL/examples/extended/electromagnetic/TestEm5 is useful for transmission studies.

A third approach would be to write a UserSteppingAction to check if the particle is on the back surface of the cylinder.

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