Neutron poison
SUBSTANCE WITH A LARGE NEUTRON ABSORPTION CROSS-SECTION, WHICH DEGRADE NUCLEAR FISSION CHAIN REACTIONS IN REACTORS
Neutron absorber; Neutronic poison; Neutron poisoning; Nuclear poisoning; Fission poisoning; Fission poison; Burnable fission poison; Burnable fission poisoning; Burnable poison; Poison, neutron; Nuclear poison; Reactor Poison; Reactor slagging; Chemical shim
In applications such as nuclear reactors, a neutron poison (also called a neutron absorber or a nuclear poison) is a substance with a large neutron absorption cross-section. In such applications, absorbing neutrons is normally an undesirable effect.