| 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 | Only Physics Lists from physics_list kernal library can be activated. |
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| 45 | Corresponding UI commands are following |
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| 46 | |
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| 47 | /testem/phys/addPhysics emstandard |
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| 48 | /testem/phys/addPhysics emstandard_opt3 |
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| 49 | /testem/phys/addPhysics empenelope |
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| 50 | /testem/phys/addPhysics emlivermore |
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| 51 | |
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| 52 | For interactive mode G4 visualization options and variables should be |
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| 53 | defined, then the example should be recompiled: |
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| 54 | |
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| 55 | gmake visclean |
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| 56 | gmake |
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| 57 | |
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| 58 | The vis.mac file can be used an example of visualization. |
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| 59 | |
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| 60 | |
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| 61 | HISTOGRAMS |
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| 62 | |
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| 63 | To use histograms any of implementations of AIDA interfaces should |
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| 64 | be available (see http://aida.freehep.org). |
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| 65 | |
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| 66 | A package including AIDA and extended interfaces also using Python |
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| 67 | is PI, available from: http://cern.ch/pi . |
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| 68 | |
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| 69 | Once installed PI or PI-Lite in a specified local area $MYPI, it is |
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| 70 | required to add the installation path to $PATH, i.e. for example, |
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| 71 | for release 1.2.1 of PI: |
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| 72 | |
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| 73 | setenv PATH ${PATH}:$MYPI/1.2.1/app/releases/PI/PI_1_2_1/rh73_gcc32/bin |
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| 74 | |
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| 75 | CERN users can use the PATH to the LCG area on AFS. |
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| 76 | |
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| 77 | Before compilation of the example it is optimal to clean up old |
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| 78 | files: |
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| 79 | |
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| 80 | gmake histclean |
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| 81 | setenv G4ANALYSIS_USE 1 |
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| 82 | gmake |
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| 83 | |
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| 84 | Before running the example the command should be issued: |
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| 85 | |
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| 86 | eval `aida-config --runtime csh` |
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| 87 | |
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| 88 | It is possible to choose the format of the output file with |
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| 89 | histograms using UI command: |
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| 90 | |
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| 91 | /testem/histoName type |
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| 92 | /testem/histoType type |
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| 93 | |
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| 94 | The following types are available: hbook, root, xml. |
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| 95 | |
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