Samarium-149 — 149Sm is a stable isotope of samarium, and a fission product (yield 1.0888%) which is a neutron absorbing nuclear poison with significant effect on nuclear reactor operation. Its neutron cross section is 40140 barns.The equilibrium concentration… … Wikipedia
Neutron poison — For information on biological effects of excessive ionizing radiation, see radiation poisoning. A neutron poison (also called a neutron absorber or a nuclear poison ) is a substance with a large neutron absorption cross section in applications,… … Wikipedia
poison — poisoner, n. poisonless, adj. poisonlessness, n. /poy zeuhn/, n. 1. a substance with an inherent property that tends to destroy life or impair health. 2. something harmful or pernicious, as to happiness or well being: the poison of slander. 3.… … Universalium
Mercury (element) — gold ← mercury → thallium Cd ↑ Hg ↓ Cn … Wikipedia
Antimony — This article is about the element. For the town, see Antimony, Utah. Not to be confused with Antinomy, a type of paradox. tin ← antimony → tellurium As ↑ Sb ↓ Bi … Wikipedia
Hot cathode — is also a name for a hot filament ionization gauge, a vacuum measuring device.In vacuum tubes, a hot cathode is a cathode electrode which emits electrons due to thermionic emission. ( Cf. cold cathodes, where field emission is used and which do… … Wikipedia
Iron — Fe redirects here. For other uses, see Fe (disambiguation). This article is about the chemical element. For other uses, see Iron (disambiguation). manganese … Wikipedia
Manganese — Not to be confused with Magnesium. This article is about the chemical element. For the ghost town, see Manganese, Minnesota. For the steamship, see SS Manganese. chromium ← manganese → iron ↑ Mn ↓ Tc … Wikipedia
Cobalt — This article is about the metal. For other uses, see Cobalt (disambiguation). iron ← cobalt → nickel ↑ Co ↓ Rh … Wikipedia
Radiation therapy — Radiation (medicine) redirects here. It is not to be confused with Radiation (pain) or Radiology. Radiation therapy Intervention ICD 10 PCS D ICD 9 CM … Wikipedia
Gold — This article is about the metal. For the color, see Gold (color). For other uses, see Gold (disambiguation). platinum ← gold → mercury … Wikipedia