Transuranics Transmutation Using Neutrons Spectrum from Spallation Reactions

Table 5

Some properties of the moderator/coolant used, with and being the scattering and absorption macroscopic cross sections, respectively.

Moderator	Average log. energy decrement	Moderating power (cm^−1)	Moderating ratio	Mean free path (cm)
C	0.158	0.0608	190	2.60	58	115
Pb	0.0096	0.0035	0.58	2.71	959	1894
Bi	0.0095	0.0024	2.4	3.91	969	1914
PbBi	0.0095	0.0029	1.58	3.37	965	1905
Na	0.0845	0.0086	0.66	8.7	109	215
H2O	0.948	3.27	149	0.29	9.7	19
He	0.425		45	47619	22	43

^(a)Number of neutrons collisions to cross the energy range 10 keV–1 eV.
^(b)Number of neutrons collisions to cross the energy range 2 MeV–0.025 eV.