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  • Comment on: 'NASA's deep space fuel supply is running out'

    Posted 05/08/2009 10:18:22 EDT

    Plutonium-238, is a radioactive isotope of plutonium with a half-life of 87.7 years and is a very powerful alpha emitter. Plutonium 238 is a by-product of the separation process used to gather Pu-240 more »

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