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2 | $Id: README,v 1.10 2007/02/27 12:02:09 sincerti Exp $ |
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4 | |
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5 | ========================================================= |
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6 | Geant4 - Microbeam example |
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7 | ========================================================= |
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8 | |
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9 | README file |
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10 | ---------------------- |
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11 | |
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12 | CORRESPONDING AUTHOR |
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13 | |
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14 | S. Incerti (a, *) et al. |
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15 | a. Centre d'Etudes Nucleaires de Bordeaux-Gradignan |
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16 | (CENBG), IN2P3 / CNRS / Bordeaux 1 University, 33175 Gradignan, France |
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17 | * e-mail:incerti@cenbg.in2p3.fr |
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18 | |
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19 | Last modified by S. Incerti, 27/02/2007 |
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20 | |
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21 | ---->0. INTRODUCTION. |
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22 | |
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23 | The microbeam example simulates the cellular irradiation beam line |
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24 | installed on the AIFIRA electrostatic accelerator facility located at |
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25 | CENBG, Bordeaux-Gradignan, France. For more information on this facility, |
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26 | please visit : |
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27 | http://www.cenbg.in2p3.fr/ |
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28 | |
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29 | An overall description of this example is also available in this directory: |
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30 | to access it, simply open the microbeam.htm file with your internet browser. |
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31 | |
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32 | ---->1. GEOMETRY SET-UP. |
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33 | |
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34 | The elements simulated are: |
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35 | |
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36 | 1. A switching dipole magnet with fringing field, to deflect the 3 MeV alpha |
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37 | beam generated by the electrostatic accelerator into the microbeam line, |
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38 | oriented at 10 degrees from the main beam direction; |
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39 | |
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40 | 2. A circular collimator object, defining the incident beam size at the |
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41 | microbeam line entrance; |
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42 | |
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43 | 3. A quadrupole based magnetic symmetric focusing system allowing equal |
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44 | transverse demagnifications of 10. Fringe fields are calculated from Enge's |
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45 | model. |
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46 | |
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47 | 4. A dedicated cellular irradiation chamber setup; |
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48 | |
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49 | 5. A set of horizontal and vertical electrostatic deflecting plates which can |
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50 | be turned on or off to deflect the beam on target; |
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51 | |
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52 | 6. A realistic human keratinocyte voxellized cell observed from confocal |
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53 | microscopy and taking into account realistic nucleus and cytoplasm chemical |
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54 | compositions |
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55 | |
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56 | |
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57 | ---->2. EXPERIMENTAL SET-UP. |
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58 | |
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59 | The beam is defined at the microbeam line entrance through a collimator |
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60 | 5 micrometer in diameter. The beam is then focused onto target using a |
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61 | quadruplet of quadrupoles in the so-called Dymnikov magnetic configuration. |
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62 | The beam is sent to the irradiation chamber where it travels through a |
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63 | isobutane gas detector for counting purpose before reaching the polypropylene |
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64 | culture foil of the target cell which is immersed in the growing medium and |
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65 | enclosed within a dish. |
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66 | |
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67 | A cell is placed on the polypropylene foil and is irradiated using the |
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68 | microbeam. The cell is represented through a 3D phantom (G4PVParameterization) |
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69 | obtained from confocal microscopy. In the provided example, the voxels sizes |
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70 | are : 359 nm (X) x 359 nm (Y) x 163 nm (Z) |
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71 | |
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72 | The primary particle beam parameters are generated from experimental |
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73 | measurements performed on the AIFIRA facility. Incident particle used for |
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74 | cellular irradiation are 3 MeV alpha particles. |
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75 | |
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76 | More details on the experimental setup and its simulation with Geant4 can |
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77 | be found in the following papers, which may be found on the SLAC-SPIRES |
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78 | online database (http://www.slac.stanford.edu/spires/) : |
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79 | |
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80 | - MONTE CARLO MICRODOSIMETRY FOR TARGETED IRRADIATION OF INDIVIDUAL CELLS USING |
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81 | A MICROBEAM FACILITY |
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82 | By S. Incerti, T. Pouthier, H. Seznec, Ph. Moretto, O. Boissonnade, |
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83 | T. M. H. Ha, F. Andersson, Ph. Barberet, C. Habchi and D. T. Nguyen |
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84 | In preparation (2007) |
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85 | |
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86 | - MONTE CARLO SIMULATION OF THE CENBG MICROBEAM AND NANOBEAM LINES WITH THE |
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87 | GEANT4 TOOLKIT |
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88 | By S. Incerti, Q. Zhang, F. Andersson, Ph. Moretto, G.W. Grime, |
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89 | M.J. Merchant, D.T. Nguyen, C. Habchi, T. Pouthier and H. Seznec |
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90 | In press in Nucl.Instrum.Meth.B, 2007 |
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91 | |
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92 | - A COMPARISON OF CELLULAR IRRADIATION TECHNIQUES WITH ALPHA PARTICLES USING |
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93 | THE GEANT4 MONTE CARLO SIMULATION TOOLKIT |
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94 | By S. Incerti, N. Gault, C. Habchi, J.L.. Lefaix, Ph. Moretto, J.L.. Poncy, |
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95 | T. Pouthier, H. Seznec. Dec 2006. 3pp. |
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96 | Published in Rad.Prot.Dos.,1-3,2006 (Micros 2005 special issue). |
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97 | |
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98 | - GEANT4 SIMULATION OF THE NEW CENBG MICRO AND NANO PROBES FACILITY |
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99 | By S. Incerti, C. Habchi, Ph. Moretto, J. Olivier and H. Seznec. May 2006. 5pp. |
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100 | Published in Nucl.Instrum.Meth.B249:738-742, 2006 |
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101 | |
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102 | - A COMPARISON OF RAY-TRACING SOFTWARE FOR THE DESIGN OF QUADRUPOLE MICROBEAM |
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103 | SYSTEMS |
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104 | By S. Incerti et al., |
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105 | Published in Nucl.Instrum.Meth.B231:76-85, 2005 |
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106 | |
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107 | - DEVELOPMENT OF A FOCUSED CHARGED PARTICLE MICROBEAM FOR THE IRRADIATION OF |
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108 | INDIVIDUAL CELLS. |
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109 | By Ph. Barberet, A. Balana, S. Incerti, C. Michelet-Habchi, Ph. Moretto, |
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110 | Th. Pouthier. Dec 2004. 6pp. |
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111 | Published in Rev.Sci.Instrum.76:015101, 2005 |
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112 | |
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113 | - SIMULATION OF CELLULAR IRRADIATION WITH THE CENBG MICROBEAM LINE USING |
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114 | GEANT4. |
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115 | By S. Incerti, Ph. Barberet, R. Villeneuve, P. Aguer, E. Gontier, |
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116 | C. Michelet-Habchi, Ph. Moretto, D.T. Nguyen, T. Pouthier, R.W. Smith. Oct 2003. 6pp. |
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117 | Published in IEEE Trans.Nucl.Sci.51:1395-1401, 2004 |
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118 | |
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119 | - SIMULATION OF ION PROPAGATION IN THE MICROBEAM LINE OF CENBG USING |
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120 | GEANT4. |
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121 | By S. Incerti, Ph. Barberet, B. Courtois, C. Michelet-Habchi, |
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122 | Ph. Moretto. Sep 2003. |
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123 | Published in Nucl.Instrum.Meth.B210:92-97, 2003 |
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124 | |
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125 | |
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126 | ---->3. SET-UP |
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127 | |
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128 | - a standard Geant4 example GNUmakefile is provided |
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129 | |
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130 | setup with: |
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131 | compiler = gcc-3.2.3 |
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132 | G4SYSTEM = linux-g++ |
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133 | |
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134 | The following section gives the necessary environment variables. |
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135 | |
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136 | ------->>3.1 ENVIRONMENT VARIABLES |
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137 | |
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138 | All variables are defined with their default value. |
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139 | |
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140 | - G4SYSTEM = Linux-g++ |
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141 | |
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142 | - G4INSTALL points to the installation directory of GEANT4; |
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143 | |
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144 | - G4LIB point to the compiled libraries of GEANT4; |
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145 | |
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146 | - G4WORKDIR points to the work directory; |
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147 | |
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148 | - CLHEP_BASE_DIR points to the installation directory of CHLEP; |
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149 | |
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150 | - G4LEDATA points to the low energy electromagnetic libraries; |
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151 | |
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152 | - LD_LIBRARY_PATH = $CLHEP_BASE_DIR/lib |
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153 | |
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154 | - G4LEVELGAMMADATA points to the photoevaporation library; |
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155 | |
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156 | - NeutronHPCrossSections points to the neutron data files; |
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157 | |
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158 | - G4RADIOACTIVEDATA points to the libraries for radio-active decay |
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159 | hadronic processes; |
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160 | |
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161 | However, the $G4LEVELGAMMADATA, $NeutronHPCrossSections and $G4RADIOACTIVEDATA |
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162 | variables do not need to be defined for this example. |
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163 | |
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164 | Once these variables have been set, simply type gmake to compile the Microbeam |
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165 | example. |
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166 | |
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167 | ------->>3.2 VISUALIZATION |
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168 | |
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169 | The user can visualize the targeted cell with OpenGL, DAWN and vrml, |
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170 | as chosen in the microbeam.mac file. OpenGL is the default viewer. The |
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171 | cytoplasm in shown in red and the nucleus in green. |
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172 | |
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173 | |
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174 | ---->4. HOW TO RUN THE EXAMPLE |
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175 | |
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176 | In interactive mode, run: |
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177 | |
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178 | > $G4WORDIR/bin/Linux-g++/Microbeam |
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179 | |
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180 | The macro microbeam.mac is executed by default. To get vizualisation, make |
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181 | sure to uncomment the /vis/... lines in the microbeam.mac macro. |
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182 | The Microbeam code reads the phantom.dat file containing all the necessary |
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183 | information describing the cell phantom. 10 alphas particles are generated. |
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184 | |
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185 | |
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186 | ---->5. PHYSICS |
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187 | |
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188 | Low energy electromagnetic processes (for alphas, electrons, photons) and |
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189 | hadronic elastic and inelastic scattering for alphas are activated by default. |
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190 | Low energy electromagnetic electronic and nuclear stopping power are computed |
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191 | from ICRU tables. |
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192 | |
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193 | |
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194 | ---->6. SIMULATION OUTPUT AND RESULT ANALYZIS |
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195 | |
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196 | This example does not need any external analysis package. |
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197 | The output results consists in several .txt files: |
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198 | |
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199 | * dose.txt : gives the total deposited dose in the cell nucleus and in the cell |
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200 | cytoplasm by each incident alpha particle; |
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201 | |
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202 | * 3DDose.txt : gives the average on the whole run of the dose deposited per |
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203 | Voxel per incident alpha particle; |
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204 | |
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205 | * range.txt : indicates the final stopping (x,y,z) position of the incident |
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206 | alpha particle within the irradiated medium (cell or culture medium) |
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207 | |
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208 | * stoppingPower.txt : gives the actual stopping power dE/dx of the incident |
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209 | alpha particle just before penetrating into the targeted cell; |
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210 | |
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211 | * beamPosition.txt : gives the beam transverse position distribution(X and Y) |
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212 | just before penetrating into the targeted cell; |
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213 | |
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214 | These files can be easily analyzed using for example the provided ROOT macro |
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215 | file plot.C; to do so : |
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216 | * be sure to have ROOT installed on your machine |
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217 | * be sure to be in the microbeam directory |
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218 | * launch ROOT by typing root |
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219 | * under your ROOT session, type in : .X plot.C to execute the macro file |
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220 | |
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221 | A graphical output obtained with this macro for 40000 incident alpha particles |
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222 | is shown in the file microbeam.gif |
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223 | |
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224 | The simulation predicts that 95% of the incident alpha particles detected by the |
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225 | gas detector are located within a circle of 10 um in diameter on the target, in |
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226 | nice agreement with experimental measurements performed on the CENBG setup. |
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227 | |
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228 | --------------------------------------------------------------------------- |
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229 | |
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230 | Should you have any enquiry, please do not hesitate to contact: |
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231 | incerti@cenbg.in2p3.fr |
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