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26 /* 26 /*
27 * \file electromagnetic/TestEm7/src/G4Lindha 27 * \file electromagnetic/TestEm7/src/G4LindhardPartition.cc
28 * \brief Implementation of the G4LindhardPar 28 * \brief Implementation of the G4LindhardPartition class
29 * 29 *
30 * Created by Marcus Mendenhall on 1/14/08. 30 * Created by Marcus Mendenhall on 1/14/08.
31 * 2008 Vanderbilt University, Nashville, TN, 31 * 2008 Vanderbilt University, Nashville, TN, USA.
32 * 32 *
33 */ 33 */
34 34
35 // 35 //
36 36
37 #include "G4LindhardPartition.hh" 37 #include "G4LindhardPartition.hh"
38 <<
39 #include "G4Element.hh" <<
40 #include "G4Material.hh" 38 #include "G4Material.hh"
>> 39 #include "G4Element.hh"
41 #include "G4PhysicalConstants.hh" 40 #include "G4PhysicalConstants.hh"
42 #include "G4SystemOfUnits.hh" 41 #include "G4SystemOfUnits.hh"
43 42
44 //....oooOO0OOooo........oooOO0OOooo........oo <<
45 /* 43 /*
46 for a first cut, we will compute NIEL from a L 44 for a first cut, we will compute NIEL from a Lindhard-Robinson partition
47 based on the most abundant element in the mate 45 based on the most abundant element in the material.
48 46
49 this is from IEEE Trans. Nucl Science Vol. 48 47 this is from IEEE Trans. Nucl Science Vol. 48 No.1 February 2001 page 162++
50 Insoo Jun, "Effects of Secondary Particles on 48 Insoo Jun, "Effects of Secondary Particles on the Total Dose..."
51 and, by reference, 49 and, by reference,
52 Lindhard, Nielsen, Scharff & Thompson, << 50 Lindhard, Nielsen, Scharff & Thompson,
53 "Integral Equations Governing Radiation Efects << 51 "Integral Equations Governing Radiation Efects...",
54 Mat. Fys. Medd. Dan. Vid. Selsk. vol 33 #10, p 52 Mat. Fys. Medd. Dan. Vid. Selsk. vol 33 #10, pp1-42, 1963
55 and 53 and
56 Robinson, "The dependence of radiation effects 54 Robinson, "The dependence of radiation effects on primary recoil energy",
57 in Proc. Int. Conf. Radiation-Induced Voids in << 55 in Proc. Int. Conf. Radiation-Induced Voids in Metal,
58 Albany, NY 1972 pp. 397-439 56 Albany, NY 1972 pp. 397-439
59 def lindhard_robinson(z1, a1, z2, a2, ke): 57 def lindhard_robinson(z1, a1, z2, a2, ke):
60 el=30.724*z1*z2*math.sqrt(z1**0.6667+z2**0.666 58 el=30.724*z1*z2*math.sqrt(z1**0.6667+z2**0.6667)*(a1+a2)/a2
61 fl=0.0793*z1**0.6667*math.sqrt(z2)*(a1+a2)**1. 59 fl=0.0793*z1**0.6667*math.sqrt(z2)*(a1+a2)**1.5/
62 ((z1**0.6667+z2**0.6667)**0.75*a1**1.5*math.sq 60 ((z1**0.6667+z2**0.6667)**0.75*a1**1.5*math.sqrt(a2))
63 eps=ke*(1.0/el) 61 eps=ke*(1.0/el)
64 return 1.0/(1+fl*(3.4008*eps**0.16667+0.40244* 62 return 1.0/(1+fl*(3.4008*eps**0.16667+0.40244*eps**0.75+eps))
65 */ 63 */
66 64
67 G4LindhardRobinsonPartition::G4LindhardRobinso << 65 G4LindhardRobinsonPartition::G4LindhardRobinsonPartition()
68 { 66 {
69 max_z = 120; 67 max_z = 120;
70 for (size_t i = 1; i < max_z; i++) { << 68 for(size_t i=1; i<max_z; i++) {z23[i]=std::pow((G4double)i, 2./3.);}
71 z23[i] = std::pow((G4double)i, 2. / 3.); <<
72 } <<
73 } 69 }
74 70
75 //....oooOO0OOooo........oooOO0OOooo........oo << 71 G4double G4LindhardRobinsonPartition::PartitionNIEL(
76 << 72 G4int z1, G4double a1, const G4Material *material, G4double energy) const
77 G4double G4LindhardRobinsonPartition::Partitio <<
78 <<
79 <<
80 { 73 {
81 size_t nMatElements = material->GetNumberOfE 74 size_t nMatElements = material->GetNumberOfElements();
82 << 75
83 const G4double* atomDensities = material->Ge << 76 const G4double *atomDensities=material->GetVecNbOfAtomsPerVolume();
84 G4double maxdens = 0.0; << 77 G4double maxdens=0.0;
85 size_t maxindex = 0; << 78 size_t maxindex=0;
86 for (size_t k = 0; k < nMatElements; k++) { << 79 for (size_t k=0 ; k < nMatElements ; k++ )
87 if (atomDensities[k] > maxdens) { << 80 {
88 maxdens = atomDensities[k]; << 81 if(atomDensities[k] > maxdens) {
89 maxindex = k; << 82 maxdens=atomDensities[k];
>> 83 maxindex=k;
>> 84 }
90 } 85 }
91 } << 86 const G4Element *element=material->GetElement(maxindex);
92 const G4Element* element = material->GetElem <<
93 87
94 G4int z2 = G4int(element->GetZ()); << 88 G4int z2=G4int(element->GetZ());
>> 89
>> 90 G4double a2=element->GetA()/(Avogadro*amu);
>> 91
>> 92 G4double zpow=z23[z1]+z23[z2];
>> 93 G4double asum=a1+a2;
>> 94
>> 95 G4double el=30.724*z1*z2*std::sqrt(zpow)*asum/a2;
>> 96 G4double fl=0.0793*z23[z1]*std::sqrt(z2*asum*asum*asum/(a1*a1*a1*a2))
>> 97 /std::pow(zpow, 0.75);
>> 98 G4double eps=(energy/eV)*(1.0/el);
95 99
96 G4double a2 = element->GetA() / (Avogadro * << 100 return
97 << 101 1.0/(1+fl*(3.4008*std::pow(eps, 0.16667)+0.40244*std::pow(eps, 0.75)+eps));
98 G4double zpow = z23[z1] + z23[z2]; <<
99 G4double asum = a1 + a2; <<
100 <<
101 G4double el = 30.724 * z1 * z2 * std::sqrt(z <<
102 G4double fl = 0.0793 * z23[z1] * std::sqrt(z <<
103 / std::pow(zpow, 0.75); <<
104 G4double eps = (energy / eV) * (1.0 / el); <<
105 <<
106 return 1.0 / (1 + fl * (3.4008 * std::pow(ep <<
107 } 102 }
>> 103
108 104