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1 =========================================================
2 Geant4 - spower example
3 =========================================================
4
5 README file
6 ----------------------
7
8 CORRESPONDING AUTHOR
9
10 S. Incerti et al. (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 spower example shows how to calculate stopping power of particles
17 in liquid water using the Geant4-DNA physics processes and models.
18
19 This example is provided by the Geant4-DNA collaboration.
20
21 These processes and models are further described at:
22 http://geant4-dna.org
23
24 Any report or published results obtained using the Geant4-DNA software shall
25 cite the following Geant4-DNA collaboration publications:
26 Med. Phys. 51 (2024) 5873–5889
27 Med. Phys. 45 (2018) e722-e739
28 Phys. Med. 31 (2015) 861-874
29 Med. Phys. 37 (2010) 4692-4708
30 Int. J. Model. Simul. Sci. Comput. 1 (2010) 157–178
31
32 and for this example:
33 Nucl. Instrum. Meth. B 397 (2017) 45-50
34
35 ---->1. GEOMETRY SET-UP.
36
37 The geometry is a 1 m radius sphere of liquid water (G4_WATER
38 material). Particles are shot randomly from the sphere centre.
39
40 Radius of the sphere, physics constructor, primary particle and
41 energy can be controlled by the spower.in macro file.
42
43 ---->2. SET-UP
44
45 Make sure G4LEDATA points to the low energy electromagnetic data files.
46
47 The code can be compiled with cmake.
48
49 It works in MT mode.
50
51 ---->3. HOW TO RUN THE EXAMPLE
52
53 In interactive mode, run:
54
55 ./spower spower.in
56
57 The spower.in macro allows a full control of the simulation.
58
59 The computation of stopping power is performed in the
60 SteppingAction::UserSteppingAction method.
61
62 ---->4. PHYSICS
63
64 Specific physics constructors, called G4EmDNAPhysics_stationary*
65 and adapted from G4EmDNAPhysics* are available to set all inelastic
66 models in a stationary mode for the computation of the stopping
67 power.
68
69 ---->5. SIMULATION OUTPUT AND RESULT ANALYSIS
70
71 The accuracy of results may depend on incident statistics as well as
72 on number of steps specified in the SteppingAction::UserSteppingAction
73 method.
74
75 The output results consist in a text file (spower.txt), containing :
76 - energy of incident particles (in eV)
77 - stopping power (in keV/um)
78 - rms (i.e. standard deviation) on stopping power (in keV/um)
