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Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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GAMMA THERAPY
I.Gudovska, V.Ivanchenko, S.Larsson
Karolinska Institute & Hospital, Stockholm, Sweden
CERN, Geneva, Switzerland
Electron beam of 50 MeV converted on target. All charged particles removed
from the beam after the target. Gamma beam irradiate a water phantom.
In front of the phantom a thin CheckVolume is placed to score gamma
beam properties. Inside the phantom a score volume is placed to calculate
radial radiation dose distribution.
GEOMETRY
GammaTherapy application geometry consists of along z:
1. Generator of electrons directed along z-axis
2. Target1 (Be, W)
3. Target2 (W, Cu)
4. GasVolume (He) all charged particles are killed inside
5. CheckVolume (Air) is sensitive for scoring in front of thephantom
6. Phantom (H2O) is sensitive for radioactive dose calculation
7. Absorber in Phantom (H2O) is sensitive for transverse dose calculation
World volume consists of Air.
STEERING
Geometry and other parameters can be defined by G4 UI commands.
Following macro files are prepared for different targets used in the real
setup: be.in (thin Be target), be_w.in (thick BeW target), cu_w.in (thick
Cu W target).
Only Physics Lists from physics_list kernal library can be activated.
Corresponding UI commands are following
/testem/phys/addPhysics emstandard
/testem/phys/addPhysics emstandard_opt3
/testem/phys/addPhysics empenelope
/testem/phys/addPhysics emlivermore
For interactive mode G4 visualization options and variables should be
defined, then the example should be recompiled:
gmake visclean
gmake
The vis.mac file can be used an example of visualization.
HISTOGRAMS
Built in histograms are provided. Name of output root file can be
defined via UI command
/testem/histoName <myName>
Gabriele Cosmo