Research Article
Improving Nuclear Safety of Fast Reactors by Slowing Down Fission Chain Reaction
Table 3
Properties of neutron moderators at 20°C.
| Moderator | Average logarithmic energy loss | Moderating ratio
| Neutron age (0.1 MeV0.5 eV) (cm2) | Diffusion length (cm) | Mean lifetime of thermal neutrons (ms) |
| H2O | 0.95 | 70 | 6 | 3 | 0.2 | D2O | 0.57 | 4590 | 58 | 147 | 130 | BeO | 0.17 | 247 | 66 | 37 | 8 |
12C | 0.16 | 242 | 160 | 56 | 13 | Pbnat | 0.00962 | 0.6 | 3033 | 13 | 0.8 |
208Pb | 0.00958 | 477 | 2979 | 341 | 598 |
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