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what is the half life of plutonium-239
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half life of plutonium 239
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what is the half life of plutonium-239, what is the half life of plutonium-238, what is the half life of plutonium-240, half life of plutonium 239, half life of plutonium 239 in years, the half life of plutonium 239 is 24300 years, how long does plutonium 239 half life last, half life plutonium 238
