G4hICRU49He Class Reference

#include <G4hICRU49He.hh>

Inheritance diagram for G4hICRU49He:

Collaboration diagram for G4hICRU49He:

Public Member Functions
	G4hICRU49He ()
	~G4hICRU49He ()
G4bool	HasMaterial (const G4Material *material)
G4double	StoppingPower (const G4Material *material, G4double kineticEnergy)
G4double	ElectronicStoppingPower (G4double z, G4double kineticEnergy) const
Public Member Functions inherited from G4VhElectronicStoppingPower
	G4VhElectronicStoppingPower ()
virtual	~G4VhElectronicStoppingPower ()

Additional Inherited Members
Protected Member Functions inherited from G4VhElectronicStoppingPower
G4double	HeEffChargeSquare (const G4double z, const G4double kineticEnergyHe) const
G4double	GetHeMassAMU () const

Detailed Description

Definition at line 58 of file G4hICRU49He.hh.

Constructor & Destructor Documentation

G4hICRU49He::G4hICRU49He

(

)

Definition at line 67 of file G4hICRU49He.cc.

                        :G4VhElectronicStoppingPower(),
  rateMass(4.0026/1.007276),
  iMolecula(0)
{;}

G4hICRU49He::~G4hICRU49He

(

)

Definition at line 74 of file G4hICRU49He.cc.

{;}

Member Function Documentation

G4double G4hICRU49He::ElectronicStoppingPower ( G4double  z, G4double  kineticEnergy  ) const

virtual

Implements G4VhElectronicStoppingPower.

Definition at line 203 of file G4hICRU49He.cc.

{
  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
  // Reduced kinetic energy

  // He energy in internal units of parametrisation formula (MeV)
  G4double T = kineticEnergy*rateMass/MeV ;

  static const G4double a[92][5] = {
    {0.35485, 0.6456, 6.01525,  20.8933, 4.3515
   },{ 0.58,    0.59,   6.3,     130.0,   44.07
   },{ 1.42,    0.49,   12.25,    32.0,    9.161
   },{ 2.1895,  0.47183,7.2362,   134.30,  197.96
   },{ 3.691,   0.4128, 18.48,    50.72,   9.0
   },{ 3.83523, 0.42993,12.6125,  227.41,  188.97
   },{ 1.9259,  0.5550, 27.15125, 26.0665, 6.2768
   },{ 2.81015, 0.4759, 50.0253,  10.556,  1.0382
   },{ 1.533,   0.531,  40.44,    18.41,   2.718
   },{ 2.303,   0.4861, 37.01,    37.96,   5.092
   },{ 9.894,   0.3081, 23.65,    0.384,   92.93
   },{ 4.3,     0.47,   34.3,     3.3,     12.74
   },{ 2.5,     0.625,  45.7,     0.1,     4.359
   },{ 2.1,     0.65,   49.34,    1.788,   4.133
   },{ 1.729,   0.6562, 53.41,    2.405,   3.845
   },{ 1.402,   0.6791, 58.98,    3.528,   3.211
   },{ 1.117,   0.7044, 69.69,    3.705,    2.156
   },{ 2.291,   0.6284, 73.88,    4.478,    2.066
   },{ 8.554,   0.3817, 83.61,    11.84,    1.875
   },{ 6.297,   0.4622, 65.39,    10.14,    5.036
   },{ 5.307,   0.4918, 61.74,    12.4,    6.665
   },{ 4.71,    0.5087, 65.28,    8.806,    5.948
   },{ 6.151,   0.4524, 83.0,    18.31,    2.71
   },{ 6.57,    0.4322, 84.76,    15.53,    2.779
   },{ 5.738,   0.4492, 84.6,    14.18,    3.101
   },{ 5.013,   0.4707, 85.8,    16.55,    3.211
   },{ 4.32,    0.4947, 76.14,    10.85,    5.441
   },{ 4.652,   0.4571, 80.73,    22.0,    4.952
   },{ 3.114,   0.5236, 76.67,    7.62,    6.385
   },{ 3.114,   0.5236, 76.67,    7.62,    7.502
   },{ 3.114,   0.5236, 76.67,    7.62,    8.514
   },{ 5.746,   0.4662, 79.24,    1.185,    7.993
   },{ 2.792,   0.6346, 106.1,    0.2986,   2.331
   },{ 4.667,   0.5095, 124.3,    2.102,    1.667
   },{ 2.44,    0.6346, 105.0,    0.83,    2.851
   },{ 1.413,   0.7377, 147.9,    1.466,    1.016
   },{ 11.72,   0.3826, 102.8,    9.231,    4.371
   },{ 7.126,   0.4804, 119.3,    5.784,    2.454
   },{ 11.61,   0.3955, 146.7,    7.031,    1.423
   },{ 10.99,   0.41,   163.9,   7.1,      1.052
   },{ 9.241,   0.4275, 163.1,    7.954,    1.102
   },{ 9.276,   0.418,  157.1,   8.038,    1.29
   },{ 3.999,   0.6152, 97.6,    1.297,    5.792
   },{ 4.306,   0.5658, 97.99,    5.514,    5.754
   },{ 3.615,   0.6197, 86.26,    0.333,    8.689
   },{ 5.8,     0.49,   147.2,   6.903,    1.289
   },{ 5.6,     0.49,   130.0,   10.0,     2.844
   },{ 3.55,    0.6068, 124.7,    1.112,    3.119
   },{ 3.6,     0.62,   105.8,   0.1692,   6.026
   },{ 5.4,     0.53,   103.1,   3.931,    7.767
   },{ 3.97,    0.6459, 131.8,    0.2233,   2.723
   },{ 3.65,    0.64,   126.8,   0.6834,   3.411
   },{ 3.118,   0.6519, 164.9,    1.208,    1.51
   },{ 3.949,   0.6209, 200.5,    1.878,    0.9126
   },{ 14.4,    0.3923, 152.5,    8.354,    2.597
   },{ 10.99,   0.4599, 138.4,    4.811,    3.726
   },{ 16.6,    0.3773, 224.1,    6.28,    0.9121
   },{ 10.54,   0.4533, 159.3,   4.832,    2.529
   },{ 10.33,   0.4502, 162.0,   5.132,    2.444
   },{ 10.15,   0.4471, 165.6,   5.378,    2.328
   },{ 9.976,   0.4439, 168.0,   5.721,    2.258
   },{ 9.804,   0.4408, 176.2,   5.675,    1.997
   },{ 14.22,   0.363,  228.4,   7.024,    1.016
   },{ 9.952,   0.4318, 233.5,   5.065,    0.9244
   },{ 9.272,   0.4345, 210.0,   4.911,    1.258
   },{ 10.13,   0.4146, 225.7,   5.525,    1.055
   },{ 8.949,   0.4304, 213.3,   5.071,    1.221
   },{ 11.94,   0.3783, 247.2,   6.655,    0.849
   },{ 8.472,   0.4405, 195.5,   4.051,    1.604
   },{ 8.301,   0.4399, 203.7,   3.667,    1.459
   },{ 6.567,   0.4858, 193.0,   2.65,     1.66
   },{ 5.951,   0.5016, 196.1,   2.662,    1.589
   },{ 7.495,   0.4523, 251.4,   3.433,    0.8619
   },{ 6.335,   0.4825, 255.1,   2.834,    0.8228
   },{ 4.314,   0.5558, 214.8,   2.354,    1.263
   },{ 4.02,    0.5681, 219.9,   2.402,    1.191
   },{ 3.836,   0.5765, 210.2,   2.742,    1.305
   },{ 4.68,    0.5247, 244.7,   2.749,    0.8962
   },{ 3.223,   0.5883, 232.7,   2.954,    1.05
   },{ 2.892,   0.6204, 208.6,   2.415,    1.416
   },{ 4.728,   0.5522, 217.0,   3.091,    1.386
   },{ 6.18,    0.52,   170.0,   4.0,      3.224
   },{ 9.0,     0.47,   198.0,   3.8,      2.032
   },{ 2.324,   0.6997, 216.0,   1.599,    1.399
   },{ 1.961,   0.7286, 223.0,   1.621,    1.296
   },{ 1.75,    0.7427, 350.1,   0.9789,   0.5507
   },{ 10.31,   0.4613, 261.2,   4.738,    0.9899
   },{ 7.962,   0.519,  235.7,   4.347,    1.313
   },{ 6.227,   0.5645, 231.9,   3.961,    1.379
   },{ 5.246,   0.5947, 228.6,   4.027,    1.432
   },{ 5.408,   0.5811, 235.7,   3.961,    1.358
   },{ 5.218,   0.5828, 245.0,   3.838,    1.25}
  };

  // Free electron gas model
  if ( T < 0.001 ) {
    G4double slow  = a[i][0] ;
    G4double shigh = std::log( 1.0 + a[i][3]*1000.0 + a[i][4]*0.001 )
                   * a[i][2]*1000.0 ;
    ionloss  = slow*shigh / (slow + shigh) ;
    ionloss *= std::sqrt(T*1000.0) ;

  // Main parametrisation
  } else {
    G4double slow  = a[i][0] * std::pow((T*1000.0), a[i][1]) ;
    G4double shigh = std::log( 1.0 + a[i][3]/T + a[i][4]*T ) * a[i][2]/T ;
    ionloss = slow*shigh / (slow + shigh) ;

  }
  if ( ionloss < 0.0) ionloss = 0.0 ;

  // He effective charge
  ionloss /= HeEffChargeSquare(z, kineticEnergy*rateMass) ;

  return ionloss;
}

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G4bool G4hICRU49He::HasMaterial ( const G4Material *  material )

virtual

Implements G4VhElectronicStoppingPower.

Definition at line 79 of file G4hICRU49He.cc.

{
  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 = 30 ;
  static const G4String name[numberOfMolecula] = {
    "H_2", "Be-Solid", "C-Solid", "Graphite", "N_2",
    "O_2", "Al-Solid", "Si-Solid", "Ar-Solid", "Cu-Solid",
    "Ge", "W-Solid", "Au-Solid", "Pb-Solid", "C_2H_2",
    "CO_2", "Cellulose-Nitrat", "C_2H_4", "LiF",
    "CH_4", "Nylon", "Polycarbonate", "(CH_2)_N-Polyetilene", "PMMA",
    "(C_8H_8)_N", "SiO_2", "CsI", "H_2O", "H_2O-Gas"};

  // Special treatment for water in gas state

  myFormula = G4String("H_2O") ;
  const G4State theState = material->GetState() ;
  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 ;
}

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G4double G4hICRU49He::StoppingPower ( const G4Material *  material, G4double  kineticEnergy  )

virtual

Implements G4VhElectronicStoppingPower.

Definition at line 119 of file G4hICRU49He.cc.

{
  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 ) ;

  // The data and the fit from:
  // ICRU Report N49, 1993. Power's model for He.
  } else if ( iMolecula < 30 ) {

    // Reduced kinetic energy
    // in internal units of parametrisation formula (MeV)
    G4double T = kineticEnergy*rateMass/MeV ;

    static const G4double c[30][7] = {
      {8.0080,  3.6287,  23.0700,  14.9900,  0.8507, 0.60, 2.0
   },{ 13.3100,  3.7432,  39.4130,  12.1990,  1.0950, 0.38, 1.4
   },{ 22.7240,  3.6040,  47.1810,  17.5490,  0.9040, 0.40, 1.4
   },{ 24.4040,  2.4032,  48.9440,  27.9730,  1.2933, 0.40, 1.6
   },{ 58.4719,  1.5115,  77.6421,  102.490,  1.5811, 0.50, 2.0
   },{ 60.5408,  1.6297,  91.7601,  94.1260,  1.3662, 0.50, 2.0
   },{ 48.4480,  6.4323,  59.2890,  18.3810,  0.4937, 0.48, 1.6
   },{ 59.0346,  5.1305,  47.0866,  30.0857,  0.3500, 0.60, 2.0
   },{ 71.8691,  2.8250,  51.1658,  57.1235,  0.4477, 0.60, 2.0
   },{ 78.3520,  4.0961,  136.731,  28.4470,  1.0621, 0.52, 1.2
   },{ 120.553,  1.5374,  49.8740,  82.2980,  0.8733, 0.45, 1.6
   },{ 249.896,  0.6996,  -37.274,  248.592,  1.1052, 0.50, 1.5
   },{ 246.698,  0.6219,  -58.391,  292.921,  0.8186, 0.56, 1.8
   },{ 248.563,  0.6235,  -36.8968, 306.960,  1.3214, 0.50, 2.0
   },{ 25.5860,  1.7125,  154.723,  118.620,  2.2580, 0.50, 2.0
   },{ 138.294,  25.6413, 231.873,  17.3780,  0.3218, 0.58, 1.3
   },{ 83.2091,  1.1294,  135.7457, 190.865,  2.3461, 0.50, 2.0
   },{ 263.542,  1.4754,  1541.446, 781.898,  1.9209, 0.40, 2.0
   },{ 59.5545,  1.5354,  132.1523, 153.3537, 2.0262, 0.50, 2.0
   },{ 31.7380,  19.820,  125.2100, 6.8910,   0.7242, 0.50, 1.1
   },{ 31.7549,  1.5682,  97.4777,  106.0774, 2.3204, 0.50, 2.0
   },{ 230.465,  4.8967,  1845.320, 358.641,  1.0774, 0.46, 1.2
   },{ 423.444,  5.3761,  1189.114, 319.030,  0.7652, 0.48, 1.5
   },{ 86.3410,  3.3322,  91.0433,  73.1091,  0.4650, 0.50, 2.0
   },{ 146.105,  9.4344,  515.1500, 82.8860,  0.6239, 0.55, 1.5
   },{ 238.050,  5.6901,  372.3575, 146.1835, 0.3992, 0.50, 2.0
   },{ 124.2338, 2.6730,  133.8175, 99.4109,  0.7776, 0.50, 2.0
   },{ 221.723,  1.5415,  87.7315,  192.5266, 1.0742, 0.50, 2.0
   },{ 26.7537,  1.3717,  90.8007,  77.1587,  2.3264, 0.50, 2.0
   },{ 37.6121,  1.8052,  73.0250,  66.2070,  1.4038, 0.50, 2.0} };

    G4double a1,a2 ;

  // Free electron gas model
    if ( T < 0.001 ) {
      G4double T0 = 0.001 ;
      a1 = 1.0 - G4Exp(-c[iMolecula][1]*std::pow(T0,-2.0+c[iMolecula][5])) ;
      a2 = (c[iMolecula][0]*std::log(T0)/T0 + c[iMolecula][2]/T0) *
            G4Exp(-c[iMolecula][4]*std::pow(T0,-c[iMolecula][6])) +
            c[iMolecula][3]/(T0*T0) ;

      ionloss *= std::sqrt(T/T0) ;

  // Main parametrisation
    } else {
      a1 = 1.0 - G4Exp(-c[iMolecula][1]*std::pow(T,-2.0+c[iMolecula][5])) ;
      a2 = (c[iMolecula][0]*std::log(T)/T + c[iMolecula][2]/T) *
            G4Exp(-c[iMolecula][4]*std::pow(T,-c[iMolecula][6])) +
            c[iMolecula][3]/(T*T) ;
    }

  // He effective charge
    G4double z = (material->GetTotNbOfElectPerVolume()) /
                 (material->GetTotNbOfAtomsPerVolume()) ;

    ionloss     = a1*a2 / HeEffChargeSquare(z, kineticEnergy*rateMass) ;

    if ( ionloss < 0.0) ionloss = 0.0 ;
  }

  return ionloss ;
}

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---

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

• geant4.10.03.p01/source/processes/electromagnetic/lowenergy/include/G4hICRU49He.hh
• geant4.10.03.p01/source/processes/electromagnetic/lowenergy/src/G4hICRU49He.cc