Current plans are to bury 70,000 tons of waste in Yucca Mountain, filling the available space by about 2036. Let us assume that 20,000 tons of this waste consists of plutonium-239, which has a half-life of 24,000 years. This means that if you take a handful of plutonium-239, you can predict that half of its atoms will have decayed within 24,000 years (although you can’t predict which ones). How much plutonium-239 will be left after 48,000 years?
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