Neutron-Multiplier Materials

Beryllium and lead used to boost the blanket's neutron count.

Materials

Beryllium, lead

Role

Raise breeding

Beryllium and lead multiply neutrons through (n,2n) reactions, raising the blanket's neutron budget so it can breed enough tritium with margin. The choice trades neutron economy against activation and resource considerations.

Multiplier selection is part of closing the breeding balance in a compact machine.