G4hICRU49p Class Reference

#include <G4hICRU49p.hh>

Inheritance diagram for G4hICRU49p:

Public Member Functions
	G4hICRU49p ()
	~G4hICRU49p ()
G4bool	HasMaterial (const G4Material *material)
G4double	StoppingPower (const G4Material *material, G4double kineticEnergy)
G4double	ElectronicStoppingPower (G4double z, G4double kineticEnergy) const

---

Detailed Description

Definition at line 59 of file G4hICRU49p.hh.

---

Constructor & Destructor Documentation

G4hICRU49p::G4hICRU49p

(

)

Definition at line 64 of file G4hICRU49p.cc.

                      :G4VhElectronicStoppingPower(), 
  iMolecula(0),
  protonMassAMU(1.007276)
{;}

G4hICRU49p::~G4hICRU49p

(

)

Definition at line 71 of file G4hICRU49p.cc.

{;}

---

Member Function Documentation

G4double G4hICRU49p::ElectronicStoppingPower	(	G4double	z,
		G4double	kineticEnergy
	)			const [virtual]

Implements G4VhElectronicStoppingPower.

Definition at line 183 of file G4hICRU49p.cc.

Referenced by StoppingPower().

{
  G4double ionloss ;
  G4int i = G4int(z)-1 ;  // index of atom
  if(i < 0)  i = 0 ;
  if(i > 91) i = 91 ;
  
  // The data and the fit from: 
  // ICRU Report 49, 1993. Ziegler's type of parametrisations.
  // Proton kinetic energy for parametrisation (keV/amu)  

  G4double T = kineticEnergy/(keV*protonMassAMU) ; 
  
  static G4double a[92][5] = {
   {1.254E+0, 1.440E+0, 2.426E+2, 1.200E+4, 1.159E-1},
   {1.229E+0, 1.397E+0, 4.845E+2, 5.873E+3, 5.225E-2},
   {1.411E+0, 1.600E+0, 7.256E+2, 3.013E+3, 4.578E-2},
   {2.248E+0, 2.590E+0, 9.660E+2, 1.538E+2, 3.475E-2},
   {2.474E+0, 2.815E+0, 1.206E+3, 1.060E+3, 2.855E-2},
   {2.631E+0, 2.601E+0, 1.701E+3, 1.279E+3, 1.638E-2},
   {2.954E+0, 3.350E+0, 1.683E+3, 1.900E+3, 2.513E-2},
   {2.652E+0, 3.000E+0, 1.920E+3, 2.000E+3, 2.230E-2},
   {2.085E+0, 2.352E+0, 2.157E+3, 2.634E+3, 1.816E-2},
   {1.951E+0, 2.199E+0, 2.393E+3, 2.699E+3, 1.568E-2},
   {2.542E+0, 2.869E+0, 2.628E+3, 1.854E+3, 1.472E-2},
   {3.791E+0, 4.293E+0, 2.862E+3, 1.009E+3, 1.397E-2},
   {4.154E+0, 4.739E+0, 2.766E+3, 1.645E+2, 2.023E-2},
   {4.914E+0, 5.598E+0, 3.193E+3, 2.327E+2, 1.419E-2},
   {3.232E+0, 3.647E+0, 3.561E+3, 1.560E+3, 1.267E-2},
   {3.447E+0, 3.891E+0, 3.792E+3, 1.219E+3, 1.211E-2},
   {5.301E+0, 6.008E+0, 3.969E+3, 6.451E+2, 1.183E-2},
   {5.731E+0, 6.500E+0, 4.253E+3, 5.300E+2, 1.123E-2},
   {5.152E+0, 5.833E+0, 4.482E+3, 5.457E+2, 1.129E-2},
   {5.521E+0, 6.252E+0, 4.710E+3, 5.533E+2, 1.112E-2},
   {5.201E+0, 5.884E+0, 4.938E+3, 5.609E+2, 9.995E-3},
   {4.858E+0, 5.489E+0, 5.260E+3, 6.511E+2, 8.930E-3},
   {4.479E+0, 5.055E+0, 5.391E+3, 9.523E+2, 9.117E-3},
   {3.983E+0, 4.489E+0, 5.616E+3, 1.336E+3, 8.413E-3},
   {3.469E+0, 3.907E+0, 5.725E+3, 1.461E+3, 8.829E-3},
   {3.519E+0, 3.963E+0, 6.065E+3, 1.243E+3, 7.782E-3},
   {3.140E+0, 3.535E+0, 6.288E+3, 1.372E+3, 7.361E-3},
   {3.553E+0, 4.004E+0, 6.205E+3, 5.551E+2, 8.763E-3},
   {3.696E+0, 4.194E+0, 4.649E+3, 8.113E+1, 2.242E-2},
   {4.210E+0, 4.750E+0, 6.953E+3, 2.952E+2, 6.809E-3},
   {5.041E+0, 5.697E+0, 7.173E+3, 2.026E+2, 6.725E-3},
   {5.554E+0, 6.300E+0, 6.496E+3, 1.100E+2, 9.689E-3},
   {5.323E+0, 6.012E+0, 7.611E+3, 2.925E+2, 6.447E-3},
   {5.874E+0, 6.656E+0, 7.395E+3, 1.175E+2, 7.684E-3},
   {6.658E+0, 7.536E+0, 7.694E+3, 2.223E+2, 6.509E-3},
   {6.413E+0, 7.240E+0, 1.185E+4, 1.537E+2, 2.880E-3},
   {5.694E+0, 6.429E+0, 8.478E+3, 2.929E+2, 6.087E-3},
   {6.339E+0, 7.159E+0, 8.693E+3, 3.303E+2, 6.003E-3},
   {6.407E+0, 7.234E+0, 8.907E+3, 3.678E+2, 5.889E-3},
   {6.734E+0, 7.603E+0, 9.120E+3, 4.052E+2, 5.765E-3},
   {6.901E+0, 7.791E+0, 9.333E+3, 4.427E+2, 5.587E-3},
   {6.424E+0, 7.248E+0, 9.545E+3, 4.802E+2, 5.376E-3},
   {6.799E+0, 7.671E+0, 9.756E+3, 5.176E+2, 5.315E-3},
   {6.109E+0, 6.887E+0, 9.966E+3, 5.551E+2, 5.151E-3},
   {5.924E+0, 6.677E+0, 1.018E+4, 5.925E+2, 4.919E-3},
   {5.238E+0, 5.900E+0, 1.038E+4, 6.300E+2, 4.758E-3},
   {5.345E+0, 6.038E+0, 6.790E+3, 3.978E+2, 1.676E-2},
   {5.814E+0, 6.554E+0, 1.080E+4, 3.555E+2, 4.626E-3},
   {6.229E+0, 7.024E+0, 1.101E+4, 3.709E+2, 4.540E-3},
   {6.409E+0, 7.227E+0, 1.121E+4, 3.864E+2, 4.474E-3},
   {7.500E+0, 8.480E+0, 8.608E+3, 3.480E+2, 9.074E-3},
   {6.979E+0, 7.871E+0, 1.162E+4, 3.924E+2, 4.402E-3},
   {7.725E+0, 8.716E+0, 1.183E+4, 3.948E+2, 4.376E-3},
   {8.337E+0, 9.425E+0, 1.051E+4, 2.696E+2, 6.206E-3},
   {7.287E+0, 8.218E+0, 1.223E+4, 3.997E+2, 4.447E-3},
   {7.899E+0, 8.911E+0, 1.243E+4, 4.021E+2, 4.511E-3},
   {8.041E+0, 9.071E+0, 1.263E+4, 4.045E+2, 4.540E-3},
   {7.488E+0, 8.444E+0, 1.283E+4, 4.069E+2, 4.420E-3},
   {7.291E+0, 8.219E+0, 1.303E+4, 4.093E+2, 4.298E-3},
   {7.098E+0, 8.000E+0, 1.323E+4, 4.118E+2, 4.182E-3},
   {6.909E+0, 7.786E+0, 1.343E+4, 4.142E+2, 4.058E-3},
   {6.728E+0, 7.580E+0, 1.362E+4, 4.166E+2, 3.976E-3},
   {6.551E+0, 7.380E+0, 1.382E+4, 4.190E+2, 3.877E-3},
   {6.739E+0, 7.592E+0, 1.402E+4, 4.214E+2, 3.863E-3},
   {6.212E+0, 6.996E+0, 1.421E+4, 4.239E+2, 3.725E-3},
   {5.517E+0, 6.210E+0, 1.440E+4, 4.263E+2, 3.632E-3},
   {5.220E+0, 5.874E+0, 1.460E+4, 4.287E+2, 3.498E-3},
   {5.071E+0, 5.706E+0, 1.479E+4, 4.330E+2, 3.405E-3},
   {4.926E+0, 5.542E+0, 1.498E+4, 4.335E+2, 3.342E-3},
   {4.788E+0, 5.386E+0, 1.517E+4, 4.359E+2, 3.292E-3},
   {4.893E+0, 5.505E+0, 1.536E+4, 4.384E+2, 3.243E-3},
   {5.028E+0, 5.657E+0, 1.555E+4, 4.408E+2, 3.195E-3},
   {4.738E+0, 5.329E+0, 1.574E+4, 4.432E+2, 3.186E-3},
   {4.587E+0, 5.160E+0, 1.541E+4, 4.153E+2, 3.406E-3},
   {5.201E+0, 5.851E+0, 1.612E+4, 4.416E+2, 3.122E-3},
   {5.071E+0, 5.704E+0, 1.630E+4, 4.409E+2, 3.082E-3},
   {4.946E+0, 5.563E+0, 1.649E+4, 4.401E+2, 2.965E-3},
   {4.477E+0, 5.034E+0, 1.667E+4, 4.393E+2, 2.871E-3},
   {4.844E+0, 5.458E+0, 7.852E+3, 9.758E+2, 2.077E-2},
   {4.307E+0, 4.843E+0, 1.704E+4, 4.878E+2, 2.882E-3},
   {4.723E+0, 5.311E+0, 1.722E+4, 5.370E+2, 2.913E-3},
   {5.319E+0, 5.982E+0, 1.740E+4, 5.863E+2, 2.871E-3},
   {5.956E+0, 6.700E+0, 1.780E+4, 6.770E+2, 2.660E-3},
   {6.158E+0, 6.928E+0, 1.777E+4, 5.863E+2, 2.812E-3},
   {6.203E+0, 6.979E+0, 1.795E+4, 5.863E+2, 2.776E-3},
   {6.181E+0, 6.954E+0, 1.812E+4, 5.863E+2, 2.748E-3},
   {6.949E+0, 7.820E+0, 1.830E+4, 5.863E+2, 2.737E-3},
   {7.506E+0, 8.448E+0, 1.848E+4, 5.863E+2, 2.727E-3},
   {7.648E+0, 8.609E+0, 1.866E+4, 5.863E+2, 2.697E-3},
   {7.711E+0, 8.679E+0, 1.883E+4, 5.863E+2, 2.641E-3},
   {7.407E+0, 8.336E+0, 1.901E+4, 5.863E+2, 2.603E-3},
   {7.290E+0, 8.204E+0, 1.918E+4, 5.863E+2, 2.673E-3}
  };

  G4double fac = 1.0 ;

    // Carbon specific case for E < 40 keV
  if ( T < 40.0 && 5 == i) {
    fac = std::sqrt(T/40.0) ;
    T = 40.0 ;  

    // Free electron gas model
  } else if ( T < 10.0 ) { 
    fac = std::sqrt(T*0.1) ;
    T =10.0 ;  
  }

  // Main parametrisation
  G4double slow  = a[i][1] * std::pow(T, 0.45) ;
  G4double shigh = std::log( 1.0 + a[i][3]/T + a[i][4]*T ) * a[i][2]/T ;
  ionloss = slow*shigh*fac / (slow + shigh) ;     
  
  if ( ionloss < 0.0) ionloss = 0.0 ;
  
  return ionloss;
}

G4bool G4hICRU49p::HasMaterial

(

const G4Material *

material

)

[virtual]

Implements G4VhElectronicStoppingPower.

Definition at line 76 of file G4hICRU49p.cc.

References G4Material::GetChemicalFormula(), G4Material::GetNumberOfElements(), G4Material::GetState(), and kStateGas.

{
  G4String chFormula = material->GetChemicalFormula() ;
  G4String myFormula = G4String(" ") ;

  if (myFormula ==  chFormula ) {
    if(1 == (material->GetNumberOfElements())) return true;
    return false ;
  }

  // ICRU Report N49, 1993. Power's model for He.
  const size_t numberOfMolecula = 11 ;    
  static G4String name[numberOfMolecula] = {
    "Al_2O_3",                 "CO_2",                      "CH_4",  
    "(C_2H_4)_N-Polyethylene", "(C_2H_4)_N-Polypropylene",  "(C_8H_8)_N",  
    "C_3H_8",                  "SiO_2",                     "H_2O",
    "H_2O-Gas",                "Graphite" } ;      
  
  // Special treatment for water in gas state
  const G4State theState = material->GetState() ;

  myFormula = G4String("H_2O");
  if( theState == kStateGas && myFormula == chFormula) {
    chFormula = G4String("H_2O-Gas");
  }
  
  // Search for the material in the table
  for (size_t i=0; i<numberOfMolecula; i++) {
      if (chFormula == name[i]) {
        SetMoleculaNumber(i) ;    
        return true ;
      }
  }
  return false ;
}

G4double G4hICRU49p::StoppingPower	(	const G4Material *	material,
		G4double	kineticEnergy
	)			[virtual]

Implements G4VhElectronicStoppingPower.

Definition at line 114 of file G4hICRU49p.cc.

References ElectronicStoppingPower(), G4Material::GetNumberOfElements(), and G4Material::GetZ().

{
  G4double ionloss = 0.0 ;

  // pure material (normally not the case for this function)
  if(1 == (material->GetNumberOfElements())) {
    G4double z = material->GetZ() ;
    ionloss = ElectronicStoppingPower( z, kineticEnergy ) ;  

  } else if (iMolecula < 11) {
  
    // The data and the fit from: 
    // ICRU Report N49, 1993. Ziegler's model for protons.
    // Proton kinetic energy for parametrisation (keV/amu)  

    G4double T = kineticEnergy/(keV*protonMassAMU) ; 

     static G4double a[11][5] = {
   {1.187E+1, 1.343E+1, 1.069E+4, 7.723E+2, 2.153E-2}, 
   {7.802E+0, 8.814E+0, 8.303E+3, 7.446E+2, 7.966E-3}, 
   {7.294E+0, 8.284E+0, 5.010E+3, 4.544E+2, 8.153E-3}, 
   {8.646E+0, 9.800E+0, 7.066E+3, 4.581E+2, 9.383E-3}, 
   {1.286E+1, 1.462E+1, 5.625E+3, 2.621E+3, 3.512E-2}, 
   {3.229E+1, 3.696E+1, 8.918E+3, 3.244E+3, 1.273E-1}, 
   {1.604E+1, 1.825E+1, 6.967E+3, 2.307E+3, 3.775E-2}, 
   {8.049E+0, 9.099E+0, 9.257E+3, 3.846E+2, 1.007E-2}, 
   {4.015E+0, 4.542E+0, 3.955E+3, 4.847E+2, 7.904E-3}, 
   {4.571E+0, 5.173E+0, 4.346E+3, 4.779E+2, 8.572E-3}, 
   {2.631E+0, 2.601E+0, 1.701E+3, 1.279E+3, 1.638E-2} };
      

    if ( T < 10.0 ) {
      ionloss = a[iMolecula][0] * std::sqrt(T) ;
    
    } else if ( T < 10000.0 ) {
      G4double slow  = a[iMolecula][1] * std::pow(T, 0.45) ;
      G4double shigh = std::log( 1.0 + a[iMolecula][3]/T  
                     + a[iMolecula][4]*T ) * a[iMolecula][2]/T ;
      ionloss = slow*shigh / (slow + shigh) ;     
    } 

    if ( ionloss < 0.0) ionloss = 0.0 ;
    // Graphite may be implemented in a very approximate way (scaling 
    // amorphous results according to rough fits to ICRU tables of results:
    // 1-100 keV: *(1+0.023+0.0066*std::log10(E))
    // 100-700 keV: *(1+0.089-0.0248*std::log10(E-99.))
    // 700-10000 keV: *(1+0.089-0.0248*std::log10(700.-99.))
    // continuity is (should!) be garanteed, but not continuity of the
    // first derivative. A better fit is in order!       
    if ( 10 == iMolecula ) { 
      if (T < 100.0) {    
        ionloss *= (1.0+0.023+0.0066*std::log10(T));  
      }
      else if (T < 700.0) {   
        ionloss *=(1.0+0.089-0.0248*std::log10(T-99.));
      } 
      else if (T < 10000.0) {    
        ionloss *=(1.0+0.089-0.0248*std::log10(700.-99.));
      }
    }
  }
  
  return ionloss;
}  

---

The documentation for this class was generated from the following files:

• G4hICRU49p.hh
• G4hICRU49p.cc

---