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plutonium-239 |
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plutonium-239 [plü′tō·nē·əm ¦tü‚thər·dē′nīn] (nuclear physics) A synthetic isotope chemically similar to uranium and neptunium; atomic number 94; made by bombardment of uranium-238 with slow neutrons in a nuclear reactor; used as nuclear reactor fuel and an ingredient for nuclear weapons. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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On the other hand, Pu-239 and Pu-240 are fallout from above-ground testing of nuclear weapons and therefore come predominantly from the ocean. |
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