1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4LowEnergyPhotoElectric.cc,v 1.59 2009/06/11 15:47:08 mantero Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03 $ |
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29 | // |
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30 | // Author: A. Forti |
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31 | // Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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32 | // |
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33 | // History: |
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34 | // -------- |
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35 | // October 1998 - low energy modifications by Alessandra Forti |
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36 | // Added Livermore data table construction methods A. Forti |
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37 | // Modified BuildMeanFreePath to read new data tables A. Forti |
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38 | // Added EnergySampling method A. Forti |
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39 | // Modified PostStepDoIt to insert sampling with EPDL97 data A. Forti |
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40 | // Added SelectRandomAtom A. Forti |
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41 | // Added map of the elements A. Forti |
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42 | // 10.04.2000 VL |
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43 | // - Correcting Fluorescence transition probabilities in order to take into account |
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44 | // non-radiative transitions. No Auger electron simulated yet: energy is locally deposited. |
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45 | // 17.02.2000 Veronique Lefebure |
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46 | // - bugs corrected in fluorescence simulation: |
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47 | // . when final use of binding energy: no photon was ever created |
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48 | // . no Fluorescence was simulated when the photo-electron energy |
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49 | // was below production threshold. |
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50 | // |
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51 | // 07-09-99, if no e- emitted: edep=photon energy, mma |
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52 | // 24.04.01 V.Ivanchenko remove RogueWave |
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53 | // 12.08.2001 MGP Revised according to a design iteration |
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54 | // 16.09.2001 E. Guardincerri Added fluorescence generation |
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55 | // 06.10.2001 MGP Added protection to avoid negative electron energies |
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56 | // when binding energy of selected shell > photon energy |
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57 | // 18.04.2001 V.Ivanchenko Fix problem with low energy gammas from fluorescence |
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58 | // MeanFreePath is calculated by crosSectionHandler directly |
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59 | // 31.05.2002 V.Ivanchenko Add path of Fluo + Auger cuts to AtomicDeexcitation |
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60 | // 14.06.2002 V.Ivanchenko By default do not cheak range of e- |
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61 | // 21.01.2003 V.Ivanchenko Cut per region |
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62 | // 10.05.2004 P.Rodrigues Changes to accommodate new angular generators |
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63 | // 20.01.2006 A.Trindade Changes to accommodate polarized angular generator |
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64 | // |
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65 | // -------------------------------------------------------------- |
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66 | |
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67 | #include "G4LowEnergyPhotoElectric.hh" |
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68 | |
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69 | #include "G4VPhotoElectricAngularDistribution.hh" |
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70 | #include "G4PhotoElectricAngularGeneratorSimple.hh" |
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71 | #include "G4PhotoElectricAngularGeneratorSauterGavrila.hh" |
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72 | #include "G4PhotoElectricAngularGeneratorPolarized.hh" |
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73 | |
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74 | #include "G4ParticleDefinition.hh" |
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75 | #include "G4Track.hh" |
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76 | #include "G4Step.hh" |
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77 | #include "G4ForceCondition.hh" |
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78 | #include "G4Gamma.hh" |
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79 | #include "G4Electron.hh" |
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80 | #include "G4DynamicParticle.hh" |
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81 | #include "G4VParticleChange.hh" |
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82 | #include "G4ThreeVector.hh" |
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83 | #include "G4VCrossSectionHandler.hh" |
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84 | #include "G4CrossSectionHandler.hh" |
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85 | #include "G4VEMDataSet.hh" |
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86 | #include "G4CompositeEMDataSet.hh" |
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87 | #include "G4VDataSetAlgorithm.hh" |
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88 | #include "G4LogLogInterpolation.hh" |
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89 | #include "G4VRangeTest.hh" |
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90 | #include "G4RangeNoTest.hh" |
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91 | #include "G4AtomicTransitionManager.hh" |
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92 | #include "G4AtomicShell.hh" |
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93 | #include "G4ProductionCutsTable.hh" |
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94 | |
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95 | G4LowEnergyPhotoElectric::G4LowEnergyPhotoElectric(const G4String& processName) |
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96 | : G4VDiscreteProcess(processName), lowEnergyLimit(250*eV), highEnergyLimit(100*GeV), |
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97 | intrinsicLowEnergyLimit(10*eV), |
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98 | intrinsicHighEnergyLimit(100*GeV), |
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99 | cutForLowEnergySecondaryPhotons(250.*eV), |
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100 | cutForLowEnergySecondaryElectrons(250.*eV) |
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101 | { |
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102 | if (lowEnergyLimit < intrinsicLowEnergyLimit || |
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103 | highEnergyLimit > intrinsicHighEnergyLimit) |
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104 | { |
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105 | G4Exception("G4LowEnergyPhotoElectric::G4LowEnergyPhotoElectric - energy limit outside intrinsic process validity range"); |
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106 | } |
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107 | |
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108 | crossSectionHandler = new G4CrossSectionHandler(); |
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109 | shellCrossSectionHandler = new G4CrossSectionHandler(); |
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110 | meanFreePathTable = 0; |
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111 | rangeTest = new G4RangeNoTest; |
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112 | generatorName = "geant4.6.2"; |
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113 | ElectronAngularGenerator = new G4PhotoElectricAngularGeneratorSimple("GEANTSimpleGenerator"); // default generator |
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114 | |
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115 | |
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116 | if (verboseLevel > 0) |
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117 | { |
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118 | G4cout << GetProcessName() << " is created " << G4endl |
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119 | << "Energy range: " |
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120 | << lowEnergyLimit / keV << " keV - " |
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121 | << highEnergyLimit / GeV << " GeV" |
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122 | << G4endl; |
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123 | } |
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124 | |
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125 | G4cout << G4endl; |
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126 | G4cout << "*******************************************************************************" << G4endl; |
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127 | G4cout << "*******************************************************************************" << G4endl; |
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128 | G4cout << " The class G4LowEnergyPhotoElectric is NOT SUPPORTED ANYMORE. " << G4endl; |
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129 | G4cout << " It will be REMOVED with the next major release of Geant4. " << G4endl; |
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130 | G4cout << " Please consult: https://twiki.cern.ch/twiki/bin/view/Geant4/LoweProcesses" << G4endl; |
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131 | G4cout << "*******************************************************************************" << G4endl; |
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132 | G4cout << "*******************************************************************************" << G4endl; |
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133 | G4cout << G4endl; |
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134 | } |
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135 | |
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136 | G4LowEnergyPhotoElectric::~G4LowEnergyPhotoElectric() |
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137 | { |
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138 | delete crossSectionHandler; |
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139 | delete shellCrossSectionHandler; |
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140 | delete meanFreePathTable; |
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141 | delete rangeTest; |
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142 | delete ElectronAngularGenerator; |
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143 | } |
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144 | |
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145 | void G4LowEnergyPhotoElectric::BuildPhysicsTable(const G4ParticleDefinition& ) |
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146 | { |
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147 | |
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148 | crossSectionHandler->Clear(); |
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149 | G4String crossSectionFile = "phot/pe-cs-"; |
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150 | crossSectionHandler->LoadData(crossSectionFile); |
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151 | |
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152 | shellCrossSectionHandler->Clear(); |
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153 | G4String shellCrossSectionFile = "phot/pe-ss-cs-"; |
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154 | shellCrossSectionHandler->LoadShellData(shellCrossSectionFile); |
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155 | |
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156 | delete meanFreePathTable; |
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157 | meanFreePathTable = crossSectionHandler->BuildMeanFreePathForMaterials(); |
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158 | } |
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159 | |
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160 | G4VParticleChange* G4LowEnergyPhotoElectric::PostStepDoIt(const G4Track& aTrack, |
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161 | const G4Step& aStep) |
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162 | { |
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163 | // Fluorescence generated according to: |
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164 | // J. Stepanek ,"A program to determine the radiation spectra due to a single atomic |
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165 | // subshell ionisation by a particle or due to deexcitation or decay of radionuclides", |
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166 | // Comp. Phys. Comm. 1206 pp 1-1-9 (1997) |
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167 | |
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168 | aParticleChange.Initialize(aTrack); |
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169 | |
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170 | const G4DynamicParticle* incidentPhoton = aTrack.GetDynamicParticle(); |
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171 | G4double photonEnergy = incidentPhoton->GetKineticEnergy(); |
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172 | if (photonEnergy <= lowEnergyLimit) |
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173 | { |
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174 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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175 | aParticleChange.ProposeEnergy(0.); |
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176 | aParticleChange.ProposeLocalEnergyDeposit(photonEnergy); |
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177 | return G4VDiscreteProcess::PostStepDoIt(aTrack,aStep); |
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178 | } |
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179 | |
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180 | G4ThreeVector photonDirection = incidentPhoton->GetMomentumDirection(); // Returns the normalized direction of the momentum |
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181 | |
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182 | // Select randomly one element in the current material |
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183 | const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple(); |
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184 | G4int Z = crossSectionHandler->SelectRandomAtom(couple,photonEnergy); |
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185 | |
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186 | // Select the ionised shell in the current atom according to shell cross sections |
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187 | size_t shellIndex = shellCrossSectionHandler->SelectRandomShell(Z,photonEnergy); |
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188 | |
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189 | // Retrieve the corresponding identifier and binding energy of the selected shell |
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190 | const G4AtomicTransitionManager* transitionManager = G4AtomicTransitionManager::Instance(); |
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191 | const G4AtomicShell* shell = transitionManager->Shell(Z,shellIndex); |
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192 | G4double bindingEnergy = shell->BindingEnergy(); |
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193 | G4int shellId = shell->ShellId(); |
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194 | |
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195 | // Create lists of pointers to DynamicParticles (photons and electrons) |
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196 | // (Is the electron vector necessary? To be checked) |
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197 | std::vector<G4DynamicParticle*>* photonVector = 0; |
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198 | std::vector<G4DynamicParticle*> electronVector; |
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199 | |
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200 | G4double energyDeposit = 0.0; |
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201 | |
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202 | // Primary outcoming electron |
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203 | G4double eKineticEnergy = photonEnergy - bindingEnergy; |
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204 | |
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205 | // There may be cases where the binding energy of the selected shell is > photon energy |
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206 | // In such cases do not generate secondaries |
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207 | if (eKineticEnergy > 0.) |
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208 | { |
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209 | // Generate the electron only if with large enough range w.r.t. cuts and safety |
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210 | G4double safety = aStep.GetPostStepPoint()->GetSafety(); |
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211 | |
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212 | if (rangeTest->Escape(G4Electron::Electron(),couple,eKineticEnergy,safety)) |
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213 | { |
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214 | |
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215 | // Calculate direction of the photoelectron |
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216 | G4ThreeVector gammaPolarization = incidentPhoton->GetPolarization(); |
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217 | G4ThreeVector electronDirection = ElectronAngularGenerator->GetPhotoElectronDirection(photonDirection,eKineticEnergy,gammaPolarization,shellId); |
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218 | |
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219 | // The electron is created ... |
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220 | G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(), |
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221 | electronDirection, |
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222 | eKineticEnergy); |
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223 | electronVector.push_back(electron); |
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224 | } |
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225 | else |
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226 | { |
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227 | energyDeposit += eKineticEnergy; |
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228 | } |
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229 | } |
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230 | else |
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231 | { |
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232 | bindingEnergy = photonEnergy; |
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233 | } |
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234 | |
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235 | G4int nElectrons = electronVector.size(); |
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236 | size_t nTotPhotons = 0; |
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237 | G4int nPhotons=0; |
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238 | const G4ProductionCutsTable* theCoupleTable= |
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239 | G4ProductionCutsTable::GetProductionCutsTable(); |
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240 | |
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241 | size_t index = couple->GetIndex(); |
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242 | G4double cutg = (*(theCoupleTable->GetEnergyCutsVector(0)))[index]; |
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243 | cutg = std::min(cutForLowEnergySecondaryPhotons,cutg); |
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244 | |
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245 | G4double cute = (*(theCoupleTable->GetEnergyCutsVector(1)))[index]; |
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246 | cute = std::min(cutForLowEnergySecondaryPhotons,cute); |
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247 | |
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248 | G4DynamicParticle* aPhoton; |
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249 | |
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250 | // Generation of fluorescence |
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251 | // Data in EADL are available only for Z > 5 |
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252 | // Protection to avoid generating photons in the unphysical case of |
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253 | // shell binding energy > photon energy |
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254 | if (Z > 5 && (bindingEnergy > cutg || bindingEnergy > cute)) |
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255 | { |
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256 | photonVector = deexcitationManager.GenerateParticles(Z,shellId); |
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257 | nTotPhotons = photonVector->size(); |
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258 | for (size_t k=0; k<nTotPhotons; k++) |
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259 | { |
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260 | aPhoton = (*photonVector)[k]; |
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261 | if (aPhoton) |
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262 | { |
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263 | G4double itsCut = cutg; |
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264 | if(aPhoton->GetDefinition() == G4Electron::Electron()) itsCut = cute; |
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265 | G4double itsEnergy = aPhoton->GetKineticEnergy(); |
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266 | |
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267 | if (itsEnergy > itsCut && itsEnergy <= bindingEnergy) |
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268 | { |
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269 | nPhotons++; |
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270 | // Local energy deposit is given as the sum of the |
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271 | // energies of incident photons minus the energies |
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272 | // of the outcoming fluorescence photons |
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273 | bindingEnergy -= itsEnergy; |
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274 | |
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275 | } |
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276 | else |
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277 | { |
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278 | delete aPhoton; |
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279 | (*photonVector)[k] = 0; |
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280 | } |
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281 | } |
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282 | } |
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283 | } |
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284 | |
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285 | energyDeposit += bindingEnergy; |
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286 | |
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287 | G4int nSecondaries = nElectrons + nPhotons; |
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288 | aParticleChange.SetNumberOfSecondaries(nSecondaries); |
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289 | |
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290 | for (G4int l = 0; l<nElectrons; l++ ) |
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291 | { |
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292 | aPhoton = electronVector[l]; |
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293 | if(aPhoton) { |
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294 | aParticleChange.AddSecondary(aPhoton); |
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295 | } |
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296 | } |
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297 | for ( size_t ll = 0; ll < nTotPhotons; ll++) |
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298 | { |
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299 | aPhoton = (*photonVector)[ll]; |
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300 | if(aPhoton) { |
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301 | aParticleChange.AddSecondary(aPhoton); |
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302 | } |
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303 | } |
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304 | |
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305 | delete photonVector; |
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306 | |
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307 | if (energyDeposit < 0) |
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308 | { |
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309 | G4cout << "WARNING - " |
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310 | << "G4LowEnergyPhotoElectric::PostStepDoIt - Negative energy deposit" |
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311 | << G4endl; |
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312 | energyDeposit = 0; |
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313 | } |
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314 | |
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315 | // Kill the incident photon |
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316 | aParticleChange.ProposeMomentumDirection( 0., 0., 0. ); |
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317 | aParticleChange.ProposeEnergy( 0. ); |
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318 | |
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319 | aParticleChange.ProposeLocalEnergyDeposit(energyDeposit); |
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320 | aParticleChange.ProposeTrackStatus( fStopAndKill ); |
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321 | |
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322 | // Reset NbOfInteractionLengthLeft and return aParticleChange |
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323 | return G4VDiscreteProcess::PostStepDoIt( aTrack, aStep ); |
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324 | } |
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325 | |
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326 | G4bool G4LowEnergyPhotoElectric::IsApplicable(const G4ParticleDefinition& particle) |
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327 | { |
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328 | return ( &particle == G4Gamma::Gamma() ); |
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329 | } |
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330 | |
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331 | G4double G4LowEnergyPhotoElectric::GetMeanFreePath(const G4Track& track, |
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332 | G4double, // previousStepSize |
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333 | G4ForceCondition*) |
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334 | { |
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335 | const G4DynamicParticle* photon = track.GetDynamicParticle(); |
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336 | G4double energy = photon->GetKineticEnergy(); |
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337 | G4Material* material = track.GetMaterial(); |
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338 | // size_t materialIndex = material->GetIndex(); |
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339 | |
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340 | G4double meanFreePath = DBL_MAX; |
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341 | |
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342 | // if (energy > highEnergyLimit) |
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343 | // meanFreePath = meanFreePathTable->FindValue(highEnergyLimit,materialIndex); |
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344 | // else if (energy < lowEnergyLimit) meanFreePath = DBL_MAX; |
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345 | // else meanFreePath = meanFreePathTable->FindValue(energy,materialIndex); |
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346 | |
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347 | G4double cross = shellCrossSectionHandler->ValueForMaterial(material,energy); |
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348 | if(cross > 0.0) meanFreePath = 1.0/cross; |
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349 | |
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350 | return meanFreePath; |
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351 | } |
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352 | |
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353 | void G4LowEnergyPhotoElectric::SetCutForLowEnSecPhotons(G4double cut) |
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354 | { |
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355 | cutForLowEnergySecondaryPhotons = cut; |
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356 | deexcitationManager.SetCutForSecondaryPhotons(cut); |
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357 | } |
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358 | |
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359 | void G4LowEnergyPhotoElectric::SetCutForLowEnSecElectrons(G4double cut) |
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360 | { |
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361 | cutForLowEnergySecondaryElectrons = cut; |
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362 | deexcitationManager.SetCutForAugerElectrons(cut); |
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363 | } |
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364 | |
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365 | void G4LowEnergyPhotoElectric::ActivateAuger(G4bool val) |
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366 | { |
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367 | deexcitationManager.ActivateAugerElectronProduction(val); |
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368 | } |
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369 | |
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370 | void G4LowEnergyPhotoElectric::SetAngularGenerator(G4VPhotoElectricAngularDistribution* distribution) |
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371 | { |
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372 | ElectronAngularGenerator = distribution; |
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373 | ElectronAngularGenerator->PrintGeneratorInformation(); |
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374 | } |
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375 | |
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376 | void G4LowEnergyPhotoElectric::SetAngularGenerator(const G4String& name) |
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377 | { |
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378 | if (name == "default") |
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379 | { |
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380 | delete ElectronAngularGenerator; |
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381 | ElectronAngularGenerator = new G4PhotoElectricAngularGeneratorSimple("GEANT4LowEnergySimpleGenerator"); |
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382 | generatorName = name; |
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383 | } |
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384 | else if (name == "standard") |
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385 | { |
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386 | delete ElectronAngularGenerator; |
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387 | ElectronAngularGenerator = new G4PhotoElectricAngularGeneratorSauterGavrila("GEANT4SauterGavrilaGenerator"); |
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388 | generatorName = name; |
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389 | } |
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390 | else if (name == "polarized") |
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391 | { |
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392 | delete ElectronAngularGenerator; |
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393 | ElectronAngularGenerator = new G4PhotoElectricAngularGeneratorPolarized("GEANT4LowEnergyPolarizedGenerator"); |
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394 | generatorName = name; |
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395 | } |
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396 | else |
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397 | { |
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398 | G4Exception("G4LowEnergyPhotoElectric::SetAngularGenerator - generator does not exist"); |
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399 | } |
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400 | |
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401 | ElectronAngularGenerator->PrintGeneratorInformation(); |
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402 | } |
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