7 Neutronics of Lead and Bismuth
199
Fig. 7.12 Sensitivity
coefficients of sample
reactivity for Pb isotopes
(Ref. [2])
(a) Inelastic scattering cross sections
(b) Elastic scattering cross sections
(c) Capture cross sections
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
0
0.2
0.4
0.6
0.8
1.0
Neutron energy [eV]
Sensitivity coefficient per lethargy
Pb-204
Pb-206
Pb-207
Pb-208
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
0
0.1
0.2
0.3
0.4
Neutron energy [eV]
Sensitivity coefficient per lethargy
Pb-204
Pb-206
Pb-207
Pb-208
10
-3
10
-2
10
-1
1
10
10
2
10
3
10
4
10
5
10
6
10
7
-0.08
-0.06
-0.04
-0.02
0
Neutron energy [eV]
Sensitivity coefficient per lethargy
Pb-204
Pb-206
Pb-207
Pb-208