Re: G4VPrimitive Scorer-Surface Current

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Hi,

 You are using G4PSPassageCellCurrent and G4PSFlatSurfaceCurrent.
The detectors are 1x1x35mm filled with water.

   Geometry
  
                 35mm
         +------------------+   
  -----> |                  |   S=1x1mm2
  -----> |                  |
         +------------------+
       (Z=-17.5mm)          (Z=+17.5mm)

 As I wrote, G4PSFlatSurfaceCurrent counts tracks at the "-Z" surface
as shown in the above figure. So, the detector length of 35mm does not
have any meanings for scoring. fCurrentIn specifys the track direction.
 The area of the surface is 1x1mm2 so that basically your result shows
the number of tracks / 1x1mm2. (You should set units for the output
value by multiplying  (mm*mm) for getting the value in an unit of [/mm2]).

 G4PSPassageCellCurrent counts number of tracks which passed the detector
volume. There is no limitation for track's directions and the scoring surface,
i.e, the scorer counts all tracks which pass the detector volume.
In this case, the detector length of 35mm contributes to wider detector
acceptance. This means we expect more counts than FlatSurfaceScorer.
The unit of G4PSPassageCellCurrent is just number of tracks.It means
number of tracks at (1x1x35mm3) volume.


 The results depends of the particle flux, i.e. anglur distribution to
the detector. But, I think your results,
 (FlatSurfaceCurrent < PassageCellCurrent), can be explained in terms 
of the detector geometry.

 You can try to compare these two scorers with very thin detector
such as 1x1x0.01mm3, and use fCurrentInOut direction for G4PSFlatSurfaceCurrent.
This case the results of two scorers should be close.
       
Tsukasa Aso