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Forum: Physics List
Re: None photo electric peak wih G4 (Guillaume Moret)
Date: 01 Apr, 2003
From: michel maire <michel maire>

 1) The NIST data base gives PhotoElectric Absorption in BGO at 511 keV :
              5.56 E-2 cm2/g
  (http://PHYSICS.NIST.GOV/PhysRefData/Xcom/Text/XCOM.html)
  for which one compute, in 2 cm BGO, an interaction rate of 54.61 %

  2) I took examples/extended/electromagnetic/TestEm1 (see README for how to run
  it), added BGO definition in DetectorConstruction, and ran with the following
  macro:

 #
 # Macro file for "TestEm1.cc"
 # (can be run in batch, without graphic)
 #
 #  PhotoElectricEffect; Gamma 511 keV
 #
 /control/verbose 2
 #
 /run/initialize
 #
 /testem/det/setMat BGO
 /testem/det/setSize 2 cm
 /testem/det/update
 #
 /testem/gun/setDefault 1
 #
 /run/verbose 2
 #
 /gun/particle gamma
 /gun/energy 511 keV
 #
 /process/list
 /process/inactivate compt
 /process/inactivate conv
 /process/inactivate eBrem
 #
 #/testem/gun/rndm  0.8
 #
 /run/beamOn 100000

 Below is the result :

 Run Summary
  Number of events processed : 100000
  User=0.32s Real=33s Sys=33s

 nb tracks/event   neutral:     1.0000   charged:     0.5411
 nb  steps/event   neutral:     1.0000   charged:     0.5411

 nb of process calls per event:

          phote       Ioni       Transportation        
         0.5411      0.5407      0.4593

  a rate of 54 %, as expected.	 

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