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pu 239 half life
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pu 242 half life
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pu 239 half life, pu 238 half life, half life of pu 239 in years, pu 236 half life, pu 242 half life, pu 241 half life, pu 240 half life, what is the half life of pu-241, half life plutonium 239, uranium 239 half life, half life of 238u, half life u 238, specific activity of pu 239, what is the energy of pu-239
