Posted by **ARIANA** on Wednesday, March 14, 2012 at 11:32pm.

Pu-239 has a half-life of 24110 y. If 1.00 kg of this isotope is present in the used fuel rods of a nuclear power plant approximately how long will it take for this amount of Pu-239 to decay until there is less than 1 mg left ?

Please help. I do not know how to do this question.

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