Common
Neutron poison
Substance that can absorb large quantities of neutrons in a reactor core
Neutron poison
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. However, neutron-absorbing materials, also called poisons, are intentionally inserted into some types of reactors in order to lower the high reactivity of their initial fresh fuel load. Some of these poisons deplete as they absorb neutrons during reactor operation, while others remain relatively constant. The accumulation of fission products that absorb neutrons is called fission-product poisoning, also known as reactor poisoning; in thermal reactors (the most common type of commercial reactor) the two most important poisons are 135Xe and 149Sm.
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