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0001 =========================================================
0002 Geant4 - an Object-Oriented Toolkit for Simulation in HEP
0003 =========================================================
0004
0005
0006 GAMMA THERAPY
0007
0008 I.Gudovska, V.Ivanchenko, S.Larsson
0009 Karolinska Institute & Hospital, Stockholm, Sweden
0010 CERN, Geneva, Switzerland
0011
0012
0013 Electron beam of 50 MeV converted on target. All charged particles removed
0014 from the beam after the target. Gamma beam irradiate a water phantom.
0015 In front of the phantom a thin CheckVolume is placed to score gamma
0016 beam properties. Inside the phantom a score volume is placed to calculate
0017 radial radiation dose distribution.
0018
0019
0020 GEOMETRY
0021
0022
0023 GammaTherapy application geometry consists of along z:
0024
0025 1. Generator of electrons directed along z-axis
0026 2. Target1 (Be, W)
0027 3. Target2 (W, Cu)
0028 4. GasVolume (He) all charged particles are killed inside
0029 5. CheckVolume (Air) is sensitive for scoring in front of thephantom
0030 6. Phantom (H2O) is sensitive for radioactive dose calculation
0031 7. Absorber in Phantom (H2O) is sensitive for transverse dose calculation
0032
0033 World volume consists of Air.
0034
0035
0036 STEERING
0037
0038 Geometry and other parameters can be defined by G4 UI commands.
0039
0040 Following macro files are prepared for different targets used in the real
0041 setup: be.in (thin Be target), be_w.in (thick BeW target), cu_w.in (thick
0042 Cu W target).
0043
0044 Only Physics Lists from physics_list kernal library can be activated.
0045 Corresponding UI commands are following
0046
0047 /testem/phys/addPhysics emstandard
0048 /testem/phys/addPhysics emstandard_opt3
0049 /testem/phys/addPhysics empenelope
0050 /testem/phys/addPhysics emlivermore
0051
0052 For interactive mode G4 visualization options and variables should be
0053 defined, then the example should be recompiled:
0054
0055 gmake visclean
0056 gmake
0057
0058 The vis.mac file can be used an example of visualization.
0059
0060
0061 HISTOGRAMS
0062
0063 Built in histograms are provided. Name of output root file can be
0064 defined via UI command
0065
0066 /testem/histoName <myName>
0067
