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0001 =========================================================
0002 Geant4 - mfp example
0003 =========================================================
0004
0005 README file
0006 ----------------------
0007
0008 CORRESPONDING AUTHOR
0009
0010 S. Incerti et al. (a, *)
0011 a. LP2i, IN2P3 / CNRS / Bordeaux University, 33175 Gradignan, France
0012 * e-mail: incerti@lp2ib.in2p3.fr
0013
0014 ---->0. INTRODUCTION.
0015
0016 The mfp example shows how to calculate mean free path of particles
0017 in liquid water using the Geant4-DNA physics processes and models.
0018
0019 It has been adapted from the spower and TestEm14 examples.
0020
0021 This example is provided by the Geant4-DNA collaboration.
0022
0023 The Geant4-DNA processes and models are further described at:
0024 http://geant4-dna.org
0025
0026 Any report or published results obtained using the Geant4-DNA software shall
0027 cite the following Geant4-DNA collaboration publications:
0028 Med. Phys. 45, (2018) e722-e739
0029 Phys. Med. 31 (2015) 861-874
0030 Med. Phys. 37 (2010) 4692-4708
0031 Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
0032
0033 ---->1. GEOMETRY SET-UP.
0034
0035 The geometry is a 1 m radius sphere of liquid water (G4_WATER
0036 material). Particles are shot along x from the sphere centre.
0037
0038 Radius of the sphere, physics constructor, primary particle type and
0039 energy can be controlled by the mfp.in macro file.
0040
0041 ---->2. SET-UP
0042
0043 Make sure G4LEDATA points to the low energy electromagnetic data files.
0044
0045 The code can be compiled with cmake.
0046
0047 It works in MT mode.
0048
0049 ---->3. HOW TO RUN THE EXAMPLE
0050
0051 Use:
0052
0053 ./mfp mfp.in
0054
0055 The mfp.in macro allows a full control of the simulation.
0056
0057 The computation of MFP and other quantities is performed in the
0058 SteppingAction::UserSteppingAction method.
0059
0060 The histo.in macro shows how to display several quantities
0061 (energy spectrum, scattering angle along x) of primary and secondaries.
0062
0063 ---->4. PHYSICS
0064
0065 G4EmDNAPhysics* constructors are used.
0066
0067 ---->5. SIMULATION OUTPUT AND RESULT ANALYSIS
0068
0069 The output results consist in a text file (mfp.txt), containing:
0070 - energy of incident particles (in eV)
0071 - mfp (in nm)
0072 - rms (i.e. standard deviation) on mfp (in nm)
0073
0074 Otherwise you may use histo.in to generate ROOT histograms of the
0075 other quantities.
