[819] | 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: G4eCrossSectionExcitationEmfietzoglou.cc,v 1.1 2007/05/04 10:16:06 pia Exp $ |
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| 28 | // GEANT4 tag $Name: $ |
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| 29 | // |
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| 30 | |
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| 31 | // $Id: G4eCrossSectionExcitationEmfietzoglou.cc,v 1.1 2007/05/04 10:16:06 pia Exp $ |
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| 32 | // GEANT4 tag $Name: $ |
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| 33 | // |
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| 34 | // Contact Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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| 35 | // |
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| 36 | // Reference: TNS Geant4-DNA paper |
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| 37 | // Reference for implementation model: NIM. 155, pp. 145-156, 1978 |
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| 38 | |
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| 39 | // History: |
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| 40 | // ----------- |
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| 41 | // Date Name Modification |
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| 42 | // 28 Apr 2007 M.G. Pia Created in compliance with design described in TNS paper |
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| 43 | // |
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| 44 | // ------------------------------------------------------------------- |
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| 45 | |
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| 46 | // Class description: |
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| 47 | // Geant4-DNA Cross total cross section for electron elastic scattering in water |
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| 48 | // Further documentation available from http://www.ge.infn.it/geant4/dna |
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| 49 | |
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| 50 | // ------------------------------------------------------------------- |
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| 51 | |
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| 52 | |
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| 53 | #include "G4eCrossSectionExcitationEmfietzoglou.hh" |
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| 54 | #include "G4Track.hh" |
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| 55 | #include "G4DynamicParticle.hh" |
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| 56 | |
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| 57 | #include "G4ParticleDefinition.hh" |
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| 58 | #include "G4Track.hh" |
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| 59 | #include "G4Electron.hh" |
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| 60 | #include "G4DynamicParticle.hh" |
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| 61 | #include "G4Material.hh" |
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| 62 | |
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| 63 | #include "Randomize.hh" |
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| 64 | |
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| 65 | G4eCrossSectionExcitationEmfietzoglou::G4eCrossSectionExcitationEmfietzoglou() |
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| 66 | { |
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| 67 | |
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| 68 | name = "eCrossSectionExcitationEmfietzoglou"; |
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| 69 | lowEnergyLimit = 7. * eV; |
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| 70 | highEnergyLimit = 10 * keV; |
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| 71 | |
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| 72 | // if (verboseLevel > 0) |
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| 73 | // { |
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| 74 | // G4cout << name << " is created " << G4endl |
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| 75 | // << "Energy range: " |
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| 76 | // << lowEnergyLimit / keV << " keV - " |
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| 77 | // << highEnergyLimit / GeV << " GeV" |
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| 78 | // << G4endl; |
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| 79 | // } |
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| 80 | } |
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| 81 | |
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| 82 | |
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| 83 | G4eCrossSectionExcitationEmfietzoglou::~G4eCrossSectionExcitationEmfietzoglou() |
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| 84 | { } |
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| 85 | |
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| 86 | |
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| 87 | G4double G4eCrossSectionExcitationEmfietzoglou::CrossSection(const G4Track& track) |
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| 88 | { |
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| 89 | const G4DynamicParticle* particle = track.GetDynamicParticle(); |
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| 90 | G4double k = particle->GetKineticEnergy(); |
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| 91 | |
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| 92 | // G4Material* material = track.GetMaterial(); |
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| 93 | |
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| 94 | // Assume that the material is water; proper algorithm to calculate correctly for any material to be inserted here |
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| 95 | |
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| 96 | // Take into account 5 excitation levels (D. Emfietzoglou et al., NIM B 193, pp. 71-78, 2002. |
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| 97 | G4int i = 5; |
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| 98 | |
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| 99 | G4double crossSection(0.); |
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| 100 | |
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| 101 | while (i>0) |
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| 102 | { |
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| 103 | i--; |
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| 104 | crossSection += PartialCrossSection(k,i); |
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| 105 | } |
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| 106 | return crossSection; |
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| 107 | } |
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| 108 | |
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| 109 | |
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| 110 | G4double G4eCrossSectionExcitationEmfietzoglou::PartialCrossSection(G4double k, G4int excitationLevel) |
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| 111 | { |
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| 112 | // Aj T |
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| 113 | // sigma(T) = ------------- (Bj / T) ln(Cj ---) [1 - Bj / T]^Pj |
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| 114 | // 2 pi alpha0 R |
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| 115 | // |
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| 116 | // T is the incoming electron kinetic energy |
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| 117 | // alpha0 is the Bohr Radius (Bohr_radius) |
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| 118 | // Aj, Bj, Cj & Pj are parameters that can be found in Emfietzoglou's papers |
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| 119 | // |
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| 120 | // |
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| 121 | // From Phys. Med. Biol. 48 (2003) 2355-2371, D.Emfietzoglou, |
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| 122 | // Monte Carlo Simulation of the energy loss of low energy electrons in liquid Water |
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| 123 | |
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| 124 | k = k / eV; |
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| 125 | const G4double sigma0 = (10. / 3.343e22) * cm2; |
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| 126 | const G4double aj[] = {0.0205, 0.0209, 0.0130, 0.0026, 0.0025}; |
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| 127 | const G4double cj[] = {4.9801, 3.3850, 2.8095, 1.9242, 3.4624}; |
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| 128 | const G4double pj[] = {0.4757, 0.3483, 0.4443, 0.3429, 0.4379}; |
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| 129 | const G4double r = 13.6 * eV; |
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| 130 | |
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| 131 | G4double cross = 0.; |
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| 132 | if (k < EnergyConstant(excitationLevel)) return cross; |
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| 133 | |
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| 134 | G4double excitationSigma = ( aj[excitationLevel] / (2. * pi * Bohr_radius)) * |
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| 135 | (EnergyConstant(excitationLevel) / k) * |
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| 136 | std::log(cj[excitationLevel] * (k / r)) * |
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| 137 | std::pow((1. - (EnergyConstant(excitationLevel) / k)), pj[excitationLevel]); |
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| 138 | G4cout << "Bohr radius = " << Bohr_radius << G4endl; |
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| 139 | |
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| 140 | cross = excitationSigma * sigma0; |
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| 141 | |
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| 142 | return cross; |
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| 143 | } |
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| 144 | |
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| 145 | |
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| 146 | G4int G4eCrossSectionExcitationEmfietzoglou::RandomizePartialCrossSection(G4double k) |
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| 147 | { |
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| 148 | // Assume 5 excitation levels |
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| 149 | |
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| 150 | G4int i = 5; |
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| 151 | G4double value = 0.; |
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| 152 | G4double values[5]; |
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| 153 | |
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| 154 | while (i>0) |
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| 155 | { |
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| 156 | i--; |
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| 157 | values[i] = PartialCrossSection(k,i); |
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| 158 | value += values[i]; |
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| 159 | } |
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| 160 | |
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| 161 | value *= G4UniformRand(); |
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| 162 | |
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| 163 | i = 5; |
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| 164 | while (i>0) |
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| 165 | { |
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| 166 | i--; |
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| 167 | |
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| 168 | if (values[i] > value) return i; |
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| 169 | |
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| 170 | value -= values[i]; |
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| 171 | } |
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| 172 | // One should never end up here; next statement added to avoid compilation warning |
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| 173 | // Probably one should throw an exception if one ends up here |
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| 174 | return 0; |
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| 175 | } |
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| 176 | |
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| 177 | G4double G4eCrossSectionExcitationEmfietzoglou::EnergyConstant(G4int excitationLevel) |
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| 178 | { |
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| 179 | const G4double ej[] ={ 8.22*eV, 10.00*eV, 11.24*eV, 12.61*eV, 13.77*eV}; |
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| 180 | G4double e = ej[excitationLevel]; |
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| 181 | |
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| 182 | return e; |
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| 183 | } |
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| 184 | |
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| 185 | |
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| 186 | |
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| 187 | |
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| 188 | //G4bool G4eCrossSectionExcitationEmfietzoglou::IsApplicable(const G4ParticleDefinition& particle) |
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| 189 | //{ |
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| 190 | // return ( &particle == G4Electron::Electron() ); |
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| 191 | //} |
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| 192 | |
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