| 1 | =========================================================
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| 2 | Geant4 - an Object-Oriented Toolkit for Simulation in HEP
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| 3 | =========================================================
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| 4 |
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| 5 |
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| 6 | GAMMA THERAPY
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| 7 |
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| 8 | I.Gudovska, V.Ivanchenko, S.Larsson
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| 9 | Karolinska Institute & Hospital, Stockholm, Sweden
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| 10 | CERN, Geneva, Switzerland
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| 11 |
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| 12 |
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| 13 | Electron beam of 50 MeV converted on target. All charged particles removed
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| 14 | from the beam after the target. Gamma beam irradiate a water phantom.
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| 15 | In front of the phantom a thin CheckVolume is placed to score gamma
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| 16 | beam properties. Inside the phantom a score volume is placed to calculate
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| 17 | radial radiation dose distribution.
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| 18 |
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| 19 |
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| 20 | GEOMETRY
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| 21 |
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| 22 |
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| 23 | GammaTherapy application geometry consists of along z:
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| 24 |
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| 25 | 1. Generator of electrons directed along z-axis
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| 26 | 2. Target1 (Be, W)
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| 27 | 3. Target2 (W, Cu)
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| 28 | 4. GasVolume (He) all charged particles are killed inside
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| 29 | 5. CheckVolume (Air) is sensitive for scoring in front of thephantom
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| 30 | 6. Phantom (H2O) is sensitive for radioactive dose calculation
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| 31 | 7. Absorber in Phantom (H2O) is sensitive for transverse dose calculation
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| 32 |
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| 33 | World volume consists of Air.
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| 34 |
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| 35 |
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| 36 | STEERING
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| 37 |
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| 38 | Geometry and other parameters can be defined by G4 UI commands.
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| 39 |
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| 40 | Following macro files are prepared for different targets used in the real
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| 41 | setup: be.in (thin Be target), be_w.in (thick BeW target), cu_w.in (thick
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| 42 | Cu W target).
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| 43 |
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| 44 | Following Physics Lists can be activated via UI commands:
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| 45 |
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| 46 | /testem/phys/addPhysics standard
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| 47 | /testem/phys/addPhysics g4v52
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| 48 | /testem/phys/addPhysics penelope
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| 49 | /testem/phys/addPhysics lowenergy
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| 50 |
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| 51 | For interactive mode G4 visualization options and variables should be
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| 52 | defined, then the example should be recompiled:
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| 53 |
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| 54 | gmake visclean
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| 55 | gmake
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| 56 |
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| 57 | The vis.mac file can be used an example of visualization.
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| 58 |
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| 59 |
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| 60 | HISTOGRAMS
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| 61 |
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| 62 | To use histograms any of implementations of AIDA interfaces should
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| 63 | be available (see http://aida.freehep.org).
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| 64 |
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| 65 | A package including AIDA and extended interfaces also using Python
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| 66 | is PI, available from: http://cern.ch/pi .
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| 67 |
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| 68 | Once installed PI or PI-Lite in a specified local area $MYPI, it is
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| 69 | required to add the installation path to $PATH, i.e. for example,
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| 70 | for release 1.2.1 of PI:
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| 71 |
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| 72 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin
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| 73 |
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| 74 | CERN users can use the PATH to the LCG area on AFS.
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| 75 |
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| 76 | Before compilation of the example it is optimal to clean up old
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| 77 | files:
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| 78 |
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| 79 | gmake histclean
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| 80 | setenv G4ANALYSIS_USE 1
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| 81 | gmake
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| 82 |
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| 83 | Before running the example the command should be issued:
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| 84 |
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| 85 | eval `aida-config --runtime csh`
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| 86 |
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| 87 | It is possible to choose the format of the output file with
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| 88 | histograms using UI command:
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| 89 |
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| 90 | /testem/histoName type
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| 91 | /testem/histoType type
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| 92 |
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| 93 | The following types are available: hbook, root, xml.
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| 94 |
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