I've been looking at the bbc website (better than doing essays that have to be handed in on Friday! ) and they have a Q&A section over there:
http://news.bbc.co.uk/1/hi/talking_point/4946456.stm
One question about the lifespan of used nuclear fuel came up with this this answer...
After 720,000 Years it should be fairly safe, I know they are only talking about on additive of Plutonium, but shit.... Will the human race still be around in 720,000 Years time, and even if we are, will have any places left to dump our used fuels?The spent nuclear fuel is the most hazardous material to deal with. It includes one isotope of Plutonium, Plutonium-239, which has a half-life of 24,000 years. After 240,000 years (10 half lives) only 0.1% will remain. After 720,000 years (30 half-lives) it should be fairly safe.
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