Current Events — HabitableZone

Current Events » in reply to The last time I posted the spot price of U308 here,

Question:

Are there other commercial uses for Uranium besides power generation?
There were when I was involved in that field, but that's before its chemical (not radioactive) toxicity was well understood. It used to be used for radiation shielding (because of it's high density and relatively low radioactivity), ceramics, paints, even sailboat ballast! As far as I know its only industrial use now is for armor-piercing projectiles. There's a lot of "depleted" Uranium about, left over after Uranium is "enriched" to make reactor fuel, which would be perfectly suitable for commercial purposes but not for fuel purposes.

Uranium is mostly U238, but there is a small concentration (about 1%) of the fissionable U235 isotope, and enrichment is the process by which this concentration is increased to about 5-6% to make reactor-grade fuel, or 95-99% for weapons-grade. A lot of U238 is left over when you do this. Plutonium is fissionable too, and is a by-product of reactor operations (formed by neutron capture in Uranium nuclei) which makes it easier to produce than the tricky process of Uranium enrichment; but it must be recovered from the spent fuel, a dirty and dangerous chemical extraction. Plutonium can be used as reactor fuel too, or for weapons, but the Carter administration (I believe) put restrictions on its use making potential weapons makers have to either go the expensive enrichment route or build their own Plutonium recovery technology. Now that nuclear weapons are becoming widespread anyway, it might be a good time to make Plutonium available as reactor fuel to alleviate any Uranium shortages which might develop in the future. I don't know how much Plutonium goes into a typical weapon (kilos, tens, hundreds of kilos?) but with all the decommisioned weapons from the Cold War, there might be enough to make a difference. Anybody know?

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