Gabriele Cosmo
126 lines
3.8 KiB
Plaintext
126 lines
3.8 KiB
Plaintext
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$Id: README,v 1.9 2010-10-08 10:01:35 sincerti Exp $
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=========================================================
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Geant4 - Microdosimetry example
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=========================================================
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README file
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----------------------
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CORRESPONDING AUTHOR
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S. Incerti (a, *), V. Ivanchenko.
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a. Centre d'Etudes Nucleaires de Bordeaux-Gradignan
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(CENBG), IN2P3 / CNRS / Bordeaux 1 University, 33175 Gradignan, France
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* e-mail:incerti@cenbg.in2p3.fr
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---->0. INTRODUCTION.
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The microdosimetry example simulates the track of a 5 MeV proton in liquid water.
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Geant4 standard EM models are used in the World volume while Geant4-DNA models
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are used in a Target volume, declared as a Region.
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---->1. GEOMETRY SET-UP.
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The geometry is a 1 mm side cube (World) made of liquid water containing a smaller cubic Target volume of liquid
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water, which dimensions are twenty times smaller than the dimensions of the World volume.
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---->2. SET-UP
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Make sure G4LEDATA points to the low energy electromagnetic libraries.
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The variable G4ANALYSIS_USE must be set to 1.
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In order to generate histograms, at least one of the AIDA implementations should be
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available.
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The code should be compiled with gmake.
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---->3. HOW TO RUN THE EXAMPLE
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In interactive mode, run:
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> $G4WORDIR/bin/$G4SYSTEM/Microdosimetry
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The macro microdosimetry.mac is executed by default.
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To get visualization, make sure to uncomment the #/control/execute vis.mac
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line in the macro.
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---->4. PHYSICS
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This example shows:
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- how to use the Geant4-DNA processes,
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- how to affect them a name
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- how to combine them with Standard EM Physics.
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A simple electron capture process is also provided in order to kill electrons
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below a chosen energy threshold, set in the Physics list.
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Look at the PhyscisList.cc file.
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---->5. SIMULATION OUTPUT AND RESULT ANALYZIS
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The output results consists in a microdosimetry.root file, containing for each simulation step:
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- the type of particle for the current step
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- the type of process for the current step
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- the track position of the current step (in nanometers)
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This file can be easily analyzed using for example the provided ROOT macro
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file plot.C; to do so :
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* be sure to have ROOT installed on your machine
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* be sure to be in the microdosimetry directory
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* launch ROOT by typing root
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* under your ROOT session, type in : .X plot.C to execute the macro file
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* alternatively you can type directly under your session : root plot.C
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The naming scheme on the displayed ROOT plots is as follows (see SteppingAction.cc):
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-particles:
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e- : 1
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proton : 2
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hydrogen : 3
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alpha : 4
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alpha+ : 5
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helium : 6
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-processes:
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e-_G4DNAElastic 11
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e-_G4DNAExcitation 12
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e-_G4DNAIonisation 13
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e-_G4DNAAttachment 14
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e-_G4DNAVibExcitation 15
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eCapture 16
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proton_G4DNAExcitation 17
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proton_G4DNAIonisation 18
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proton_G4DNAChargeDecrease 19
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hydrogen_G4DNAExcitation 20
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hydrogen_G4DNAIonisation 21
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hydrogen_G4DNAChargeIncrease 22
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alpha_G4DNAExcitation 23
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alpha_G4DNAIonisation 24
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alpha_G4DNAChargeDecrease 25
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alpha+_G4DNAExcitation 26
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alpha+_G4DNAIonisation 27
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alpha+_G4DNAChargeDecrease 28
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alpha+_G4DNAChargeIncrease 29
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helium_G4DNAExcitation 30
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helium_G4DNAIonisation 31
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helium_G4DNAChargeIncrease 32
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hIoni 33
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eIoni 34
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---------------------------------------------------------------------------
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Should you have any enquiry, please do not hesitate to contact:
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incerti@cenbg.in2p3.fr
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