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: G4DNAProcess.icc,v 1.12 2009/01/20 07:50:28 sincerti Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-03-beta-cand-00 $ |
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29 | // |
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30 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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31 | // |
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32 | // Reference: TNS Geant4-DNA paper |
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33 | // |
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34 | |
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35 | // History: |
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36 | // ----------- |
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37 | // Date Name Modification |
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38 | // 28 Apr 2007 M.G. Pia Created in compliance with design described in TNS paper |
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39 | // |
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40 | // ------------------------------------------------------------------- |
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41 | |
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42 | |
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43 | template <class TCrossSection,class TFinalState> |
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44 | G4double G4DNAProcess<TCrossSection,TFinalState>::GetMeanFreePath(const G4Track& track, |
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45 | G4double /* previousStepSize */, |
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46 | G4ForceCondition* /* condition */) |
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47 | { |
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48 | G4double meanFreePath = DBL_MAX; |
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49 | |
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50 | // Assume the interacting medium to be water; one of the elements must be oxygen |
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51 | G4Material* material(track.GetMaterial()); |
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52 | size_t i = material->GetNumberOfElements(); |
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53 | while (i>0) |
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54 | { |
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55 | i--; |
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56 | const G4Element* element(material->GetElement(i)); |
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57 | if (element->GetZ() == 8.) |
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58 | { |
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59 | // Number of oxygen atoms per volume = number of water molecules per volume |
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60 | G4double density = material->GetAtomicNumDensityVector()[i]; |
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61 | // G4cout << "density = " << density << G4endl; |
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62 | if (density > 0.) |
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63 | { |
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64 | G4double cross = crossSection.CrossSection(track); |
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65 | if (cross > 0.0) meanFreePath = 1. / (density*cross); |
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66 | if (meanFreePath == 0.) meanFreePath = DBL_MIN; |
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67 | return meanFreePath; |
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68 | } |
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69 | } |
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70 | } // end while |
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71 | |
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72 | // If it ends up here, it means that the material is not water |
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73 | G4Exception("G4DNAProcess::GetMeanFreePath - material is not water"); |
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74 | // One does not really need a return statement here |
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75 | return DBL_MAX; |
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76 | } |
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77 | |
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78 | |
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79 | template <class TCrossSection,class TFinalState> |
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80 | G4VParticleChange* G4DNAProcess<TCrossSection,TFinalState>::PostStepDoIt(const G4Track& track, const G4Step& step) |
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81 | { |
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82 | aParticleChange.Initialize(track); |
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83 | |
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84 | // G4cout << "Track initialized" << G4endl; |
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85 | |
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86 | // Interaction product |
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87 | const G4FinalStateProduct& product = finalState.GenerateFinalState(track,step); |
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88 | |
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89 | // Number of secondary products to be generated |
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90 | G4int nSecondaries = product.NumberOfSecondaries(); |
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91 | aParticleChange.SetNumberOfSecondaries(nSecondaries); |
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92 | |
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93 | // Secondaries |
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94 | for (G4int l = 0; l<nSecondaries; l++ ) |
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95 | { |
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96 | G4DynamicParticle* particle = product.GetSecondaries()[l]; |
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97 | if (particle != 0) |
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98 | { |
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99 | // aParticleChange.SetNumberOfSecondaries(nSecondaries); |
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100 | aParticleChange.AddSecondary(particle); |
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101 | } |
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102 | } |
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103 | |
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104 | // Take care of incident particle to be killed, if necessary; dump its energy deposit locally |
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105 | G4double deposit = product.GetEnergyDeposit(); |
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106 | if (deposit > 0.0) aParticleChange.ProposeLocalEnergyDeposit(deposit); |
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107 | |
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108 | if (product.PrimaryParticleIsKilled()) |
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109 | { |
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110 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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111 | aParticleChange.ProposeEnergy(0.); |
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112 | aParticleChange.ProposeMomentumDirection( 0., 0., 0. ); |
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113 | |
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114 | if (product.PrimaryParticleIsKilledAndDoNotDepositEnergy()) |
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115 | { |
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116 | aParticleChange.ProposeLocalEnergyDeposit(deposit); |
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117 | } |
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118 | else |
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119 | { |
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120 | aParticleChange.ProposeLocalEnergyDeposit(track.GetKineticEnergy() + deposit); |
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121 | } |
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122 | |
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123 | } |
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124 | else |
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125 | { |
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126 | // Modify incident particle kinematics taking into account the generated products |
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127 | |
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128 | // ---- MGP ---- Temporary: assume at most one secondary product |
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129 | // Sebastien: please check if consistent with current models or generalize |
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130 | |
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131 | // Primary particle momentum and kinetic energy |
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132 | G4ThreeVector primaryMomentum = track.GetMomentum(); |
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133 | G4double primaryKineticEnergy = track.GetKineticEnergy(); |
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134 | |
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135 | // Secondary product momentum and energy |
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136 | |
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137 | G4double secondaryKineticEnergy = 0.; |
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138 | if (nSecondaries >0 ) |
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139 | { |
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140 | G4DynamicParticle* secondary = product.GetSecondaries()[0]; |
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141 | secondaryKineticEnergy = secondary->GetKineticEnergy(); |
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142 | |
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143 | // Calculate new primary particle kinetic energy |
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144 | G4double finalKineticEnergy = primaryKineticEnergy - secondaryKineticEnergy - deposit; |
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145 | |
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146 | if (finalKineticEnergy <= 0.0) |
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147 | { |
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148 | // Primary particle is stopped; kill it |
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149 | aParticleChange.ProposeTrackStatus(fStopAndKill); |
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150 | aParticleChange.ProposeEnergy(0.); |
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151 | aParticleChange.ProposeMomentumDirection( 0., 0., 0. ); |
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152 | } |
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153 | else |
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154 | { |
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155 | // Calculate new primary particle momentum: difference between original primary one and secondary |
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156 | G4ThreeVector secondaryMomentum = secondary->GetMomentum(); |
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157 | G4ThreeVector finalMomentum = primaryMomentum - secondaryMomentum; |
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158 | G4ThreeVector finalDirection = finalMomentum.unit(); |
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159 | aParticleChange.ProposeMomentumDirection(finalDirection); |
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160 | aParticleChange.ProposeEnergy(finalKineticEnergy); |
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161 | } |
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162 | } |
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163 | else |
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164 | { |
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165 | // Check whether primary particle is modified |
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166 | if (product.PrimaryParticleIsModified()) |
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167 | { |
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168 | G4ThreeVector finalDirection = product.GetModifiedDirection(); |
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169 | aParticleChange.ProposeMomentumDirection(finalDirection); |
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170 | G4double finalKineticEnergy = product.GetModifiedEnergy(); |
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171 | aParticleChange.ProposeEnergy(finalKineticEnergy); |
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172 | } |
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173 | } |
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174 | |
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175 | } |
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176 | |
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177 | return G4VDiscreteProcess::PostStepDoIt(track,step ); |
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178 | } |
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