151 Sm is a medium-lived fission product and acts as a neutron poison in the nuclear fuel cycle.
12.
The major problem was impurities in the uranium oxide, which could act as neutron poisons and prevent a nuclear chain reaction.
13.
If a neutron absorber, or neutron poison, is injected at any time during this period, the reactor will shut down.
14.
Xenon-135 in particular tremendously affects the operation of a nuclear reactor because it's the most powerful known neutron poison.
15.
In a nuclear reactor, such a chain reaction is slowed and controlled by a neutron poison, absorbing some of the free neutrons.
16.
Unfortunately, the calcium hydride contained unacceptable amounts of boron, a neutron poison, making the metal unsuitable for use in a reactor.
17.
To prevent a post-accident nuclear reaction, steps have been taken, such as adding neutron poisons to key parts of the basement.
18.
Excessive neutron poison loads in experiments in target positions are discouraged because of their adverse effects on both transplutonium isotope production rates and fuel cycle length.
19.
Overall, europium is overshadowed by caesium-137 and strontium-90 as a radiation hazard, and by samarium and others as a neutron poison.
20.
The common fission product Xenon-135 produced in the fission process acts as a neutron poison that absorbs neutrons and therefore tends to shut the reactor down.
