americium

• These elements-a group that includes americium and neptunium-are known as non-fissile transuranics. —  U.S. News
• More recently, there has been interest in transmuting the long-lived transuranic radionuclides (the actinides neptunium, americium and curium particularly) formed by neutron capture in a conventional reactor and reporting with the high-level waste. —  Featured Articles - Encyclopedia of Earth
• The addition of americium, a form of the basic synthetic element found in commercial smoke detectors, "denatures" the plutonium, ensuring it can be used for peaceful purposes only. —  Israel Matzav
• More plutonium, uranium, americium, cesium, thorium, take your pickium there's a container of it buried out there, probably mixed with something toxic, mutagenic, or carcinogenic that's equally scary when it's not radioactive. —  freshnews.org - most clicked links
• The 5 percent stream would be plutonium, curium, neptunium, and americium to burn in the reactor.

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