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1 =========================================================
2 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
3 =========================================================
4
5
6 GAMMA THERAPY
7
8 I.Gudovska, V.Ivanchenko, S.Larsson
9 Karolinska Institute & Hospital, Stockholm, Sweden
10 CERN, Geneva, Switzerland
11
12
13 Electron beam of 50 MeV converted on target. All charged particles removed
14 from the beam after the target. Gamma beam irradiate a water phantom.
15 In front of the phantom a thin CheckVolume is placed to score gamma
16 beam properties. Inside the phantom a score volume is placed to calculate
17 radial radiation dose distribution.
18
19
20 GEOMETRY
21
22
23 GammaTherapy application geometry consists of along z:
24
25 1. Generator of electrons directed along z-axis
26 2. Target1 (Be, W)
27 3. Target2 (W, Cu)
28 4. GasVolume (He) all charged particles are killed inside
29 5. CheckVolume (Air) is sensitive for scoring in front of thephantom
30 6. Phantom (H2O) is sensitive for radioactive dose calculation
31 7. Absorber in Phantom (H2O) is sensitive for transverse dose calculation
32
33 World volume consists of Air.
34
35
36 STEERING
37
38 Geometry and other parameters can be defined by G4 UI commands.
39
40 Following macro files are prepared for different targets used in the real
41 setup: be.in (thin Be target), be_w.in (thick BeW target), cu_w.in (thick
42 Cu W target).
43
44 Only Physics Lists from physics_list kernal library can be activated.
45 Corresponding UI commands are following
46
47 /testem/phys/addPhysics emstandard
48 /testem/phys/addPhysics emstandard_opt3
49 /testem/phys/addPhysics empenelope
50 /testem/phys/addPhysics emlivermore
51
52 For interactive mode G4 visualization options and variables should be
53 defined, then the example should be recompiled:
54
55 gmake visclean
56 gmake
57
58 The vis.mac file can be used an example of visualization.
59
60
61 HISTOGRAMS
62
63 Built in histograms are provided. Name of output root file can be
64 defined via UI command
65
66 /testem/histoName <myName>
67
