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244
Wikipedia definition
1. Plutonium-244Plutonium-244 (Pu) is an isotope of plutonium that has a halflife of 80 million years. This is longer than any of the other isotopes of plutonium and longer than any actinide except for the three naturally abundant ones uranium-235 (700my), uranium-238, and thorium-232.
Read “Plutonium-244” on English Wikipedia
Read “プルトニウム244” on Japanese Wikipedia
Read “Plutonium-244” on DBpedia

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