URANIUM
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Uranium fuel rod
U-235 5%
U-238 95%
when rod is used
U-235 breaks up
U-238 --> U-239 --> Np-239 --> Pu-239
after U-235 portion drops to 0.3%
the rod is used up
waste storage: 10,000 years
Pu-239 can be used to build nuclear weapons
THORIUM
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Th-232 --> Th-233 --> Pa-233 --> U-233
U-233 is then used to make pellets
when pellets are used
no U-238 in pellets => no Pu-239 is created
U-233 --> U-232 --> Tl-208
waste storage: 300 years
U-233 can be used to build nuclear weapons,
but only after the U-232 is separated from the mix
https://en.wikipedia.org/wiki/Uraniumhttps://en.wikipedia.org/wiki/Plutoniumhttps://en.wikipedia.org/wiki/Thoriumhttps://en.wikipedia.org/wiki/Thalliumhttps://en.wikipedia.org/wiki/Isotopes_of_uraniumhttps://en.wikipedia.org/wiki/Isotopes_of_plutoniumhttps://en.wikipedia.org/wiki/Isotopes_of_thoriumhttps://en.wikipedia.org/wiki/Isotopes_of_thalliumhttps://en.wikipedia.org/wiki/Uranium-232https://en.wikipedia.org/wiki/Thorium_fuel_cycle 
