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Our group used to have one bottle O-18 water
Its like >1300 usd per gram lol
http://www.sigmaaldrich.com/catalog/product/aldrich/487090?lang=en&region=HK

Hoooooooooly moly!! I had no idea it was so expensive to produce!

I am not sure how they do enrichment, probably by things like centrifegue (?)
U can check uranium-235 enrichment, its pretty interesting

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