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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. 51 (2024) 5873–5889
0029 Med. Phys. 45 (2018) e722-e739
0030 Phys. Med. 31 (2015) 861-874
0031 Med. Phys. 37 (2010) 4692-4708
0032 Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
0033
0034 ---->1. GEOMETRY SET-UP.
0035
0036 The geometry is a 1 m radius sphere of liquid water (G4_WATER
0037 material). Particles are shot along x from the sphere centre.
0038
0039 Radius of the sphere, physics constructor, primary particle type and
0040 energy can be controlled by the mfp.in macro file.
0041
0042 ---->2. SET-UP
0043
0044 Make sure G4LEDATA points to the low energy electromagnetic data files.
0045
0046 The code can be compiled with cmake.
0047
0048 It works in MT mode.
0049
0050 ---->3. HOW TO RUN THE EXAMPLE
0051
0052 Use:
0053
0054 ./mfp mfp.in
0055
0056 The mfp.in macro allows a full control of the simulation.
0057
0058 The computation of MFP and other quantities is performed in the
0059 SteppingAction::UserSteppingAction method.
0060
0061 The histo.in macro shows how to display several quantities
0062 (energy spectrum, scattering angle along x) of primary and secondaries.
0063
0064 ---->4. PHYSICS
0065
0066 G4EmDNAPhysics* constructors are used.
0067
0068 ---->5. SIMULATION OUTPUT AND RESULT ANALYSIS
0069
0070 The output results consist in a text file (mfp.txt), containing:
0071 - energy of incident particles (in eV)
0072 - mfp (in nm)
0073 - rms (i.e. standard deviation) on mfp (in nm)
0074
0075 Otherwise you may use histo.in to generate ROOT histograms of the
0076 other quantities.
