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1 =========================================================
2 Geant4 - wvalue example
3 =========================================================
4
5 README file
6 ----------------------
7
8 CORRESPONDING AUTHOR
9
10 S. Incerti (a, *)
11 a. LP2i, IN2P3 / CNRS / Bordeaux University, 33175 Gradignan, France
12 * e-mail: incerti@lp2ib.in2p3.fr
13
14 ---->0. INTRODUCTION.
15
16 The wvalue example shows how to calculate w in liquid water
17 for e- using the Geant4-DNA physics processes and models.
18
19 w is computed as the ratio of the incident particle energy
20 and the total number of ionisations.
21
22 It is adapted from the svalue example.
23
24 This example is provided by the Geant4-DNA collaboration.
25
26 These processes and models are further described at:
27 http://geant4-dna.org
28
29 Any report or published results obtained using the Geant4-DNA software shall
30 cite the following Geant4-DNA collaboration publications:
31 Med. Phys. 51 (2024) 5873–5889
32 Med. Phys. 45 (2018) e722-e739
33 Phys. Med. 31 (2015) 861-874
34 Med. Phys. 37 (2010) 4692-4708
35 Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
36
37 This example is presented in the following paper, which shall also be cited:
38 Med. Phys. 42 (2015) 3870-3876
39
40 ---->1. GEOMETRY SET-UP.
41
42 The geometry is a 1 m radius sphere of liquid water (G4_WATER
43 material). Particles are shot randomly from the sphere centre.
44
45 Radius of the sphere, physics constructor and energy can be
46 controlled by the wvalue.in macro file.
47
48 The PrimaryGeneratorAction class is adapted (G4 state dependent)
49 in order to enable generic physics list usage
50 (empty modular physics list).
51
52 ---->2. SET-UP
53
54 Make sure G4LEDATA points to the low energy electromagnetic data files.
55
56 The code can be compiled with cmake.
57
58 It works in MT mode.
59
60 ---->3. HOW TO RUN THE EXAMPLE
61
62 In interactive mode, run:
63
64 ./wvalue wvalue.in
65
66 The wvalue.in macro allows a full control of the simulation.
67
68 ---->4. PHYSICS
69
70 You can select Geant4-DNA physics constructor in wvalue.in.
71
72 A tracking cut can be applied if requested.
73
74 ---->5. SIMULATION OUTPUT AND RESULT ANALYSIS
75
76 The output results consist in a text file (wvalue.txt), containing:
77 - the energy of incident particles (in eV)
78 - the mean number of ionisations
79 - its rms
80 - the w value (in eV)
81 - its rms (in eV)
82
83 Note: rms values correspond to standard deviation.
84
85 In addition, another macro (histo.in) is also provided including
86 a series of histograms:
87 - histogram #1 : nb of ionisation interactions per event
88 - histogram #2 : total energy deposited in absorber
89 - histogram #3 : true track length of the primary particle
90 - histogram #4 : true step size of the primary particle
91 - histogram #5 : projected range of the primary particle
92 - histogram #6 : true track length of charged secondaries
93 - histogram #7 : true track length of charged secondaries
