Gabriele Cosmo
105 lines
4.0 KiB
C++
105 lines
4.0 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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/*
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* \file electromagnetic/TestEm7/src/G4LindhardPartition.cc
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* \brief Implementation of the G4LindhardPartition class
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*
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* Created by Marcus Mendenhall on 1/14/08.
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* 2008 Vanderbilt University, Nashville, TN, USA.
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*
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*/
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//
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// $Id: G4LindhardPartition.cc 68263 2013-03-20 10:16:46Z maire $
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#include "G4LindhardPartition.hh"
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#include "G4Material.hh"
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#include "G4Element.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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/*
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for a first cut, we will compute NIEL from a Lindhard-Robinson partition
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based on the most abundant element in the material.
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this is from IEEE Trans. Nucl Science Vol. 48 No.1 February 2001 page 162++
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Insoo Jun, "Effects of Secondary Particles on the Total Dose..."
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and, by reference,
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Lindhard, Nielsen, Scharff & Thompson,
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"Integral Equations Governing Radiation Efects...",
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Mat. Fys. Medd. Dan. Vid. Selsk. vol 33 #10, pp1-42, 1963
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and
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Robinson, "The dependence of radiation effects on primary recoil energy",
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in Proc. Int. Conf. Radiation-Induced Voids in Metal,
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Albany, NY 1972 pp. 397-439
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def lindhard_robinson(z1, a1, z2, a2, ke):
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el=30.724*z1*z2*math.sqrt(z1**0.6667+z2**0.6667)*(a1+a2)/a2
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fl=0.0793*z1**0.6667*math.sqrt(z2)*(a1+a2)**1.5/
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((z1**0.6667+z2**0.6667)**0.75*a1**1.5*math.sqrt(a2))
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eps=ke*(1.0/el)
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return 1.0/(1+fl*(3.4008*eps**0.16667+0.40244*eps**0.75+eps))
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*/
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G4LindhardRobinsonPartition::G4LindhardRobinsonPartition()
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{
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max_z = 120;
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for(size_t i=1; i<max_z; i++) {z23[i]=std::pow((G4double)i, 2./3.);}
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}
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G4double G4LindhardRobinsonPartition::PartitionNIEL(
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G4int z1, G4double a1, const G4Material *material, G4double energy) const
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{
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size_t nMatElements = material->GetNumberOfElements();
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const G4double *atomDensities=material->GetVecNbOfAtomsPerVolume();
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G4double maxdens=0.0;
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size_t maxindex=0;
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for (size_t k=0 ; k < nMatElements ; k++ )
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{
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if(atomDensities[k] > maxdens) {
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maxdens=atomDensities[k];
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maxindex=k;
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}
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}
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const G4Element *element=material->GetElement(maxindex);
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G4int z2=G4int(element->GetZ());
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G4double a2=element->GetA()/(Avogadro*amu);
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G4double zpow=z23[z1]+z23[z2];
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G4double asum=a1+a2;
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G4double el=30.724*z1*z2*std::sqrt(zpow)*asum/a2;
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G4double fl=0.0793*z23[z1]*std::sqrt(z2*asum*asum*asum/(a1*a1*a1*a2))
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/std::pow(zpow, 0.75);
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G4double eps=(energy/eV)*(1.0/el);
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return
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1.0/(1+fl*(3.4008*std::pow(eps, 0.16667)+0.40244*std::pow(eps, 0.75)+eps));
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}
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