Engine List 2 - Atomic Rockets
The fast neutrons must be thermalized by a low Z moderator (a surrounding blanket of about 80 cm of D 2 O, Be, liquid or gas D 2, or CD 4), which returns enough thermal neutrons to the core to sustain the chain reaction. (Thermal neutrons diffuse through the reactor like a low pressure gas.) Alternatively, a molybdenum neutron reflector can be ...
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