nuclear poison
substance with a large neutron absorption cross-section, which degrade nuclear fission chain reactions in reactors
en-GB/ˈnjuːklɪə ˈpɔɪzn/
en-US/ˈnukliɚ ˈpɔɪzən/
substance with a large neutron absorption cross-section, which degrade nuclear fission chain reactions in reactors