This may be where that 0.7 g comes from http://factually.gizmodo.com/less-than-2-of-the-uranium-in-the-hiroshima-bomb-actua-1624444762 …
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770g is 2% of 38.5Kg of U235, checks out
You have to add both projectile and target— 64 kg total
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Oh right, more like 1.2% then huh? Crazy!
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Groves nixed the idea, said there wasn't enough time
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The Nagasaki bomb only had 6.2 kg of plutonium in it
End of conversation
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