material or body of material which reflects incident radiation
Note 1 to entry: In nuclear reactor technology, this term is usually restricted to designate a part of a nuclear reactor placed adjacent to the core for the purpose of returning some of the escaping neutrons back into the core by scattering collisions (without appreciable capture). Note 2 to entry: This entry was numbered 393-17-21 in IEC 60050-393:2003.
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