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Question How to get projection data using scoring mesh? 

Forum: Biasing and Scoring
Date: 02 Sep, 2015
From: Tenta Sasaya <Tenta Sasaya>

Hi, I'm trying to simulate fluorescent x-ray computed tomography. Attachment shows schematic geometry.

I use following code in the macro file to acquire projection data.

#------------------------------------------
#Define mesh
/score/create/boxMesh boxMesh_1

/score/mesh/boxSize 6.88 0.16 3.44 mm

/score/mesh/nBin 80 1 40

/score/mesh/translate/xyz 0.0 -60.0 0.0 mm

#Define filter(20-30 keV means detector's energy range)

/score/quantity/passageCellCurrent scoreFluorescense 1 false false

/score/filter/particleWithKineticEnergy gammaFilterEnergy 20.0 30.0 keV gamma

/score/close

#end--------------------------------------

In this case, I think this scoring mesh performs same role as detector which has quantum efficiency of 100%. However, the number of photons in the acquired projection data seems to be less than the actual experimental data.

Is there a mistake?

Thank you in advance,

Ten

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2015/09/02/19.31-5253-geometry.png

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