3h47m15s16f Half-Lives of Nuclear Fuels - Th-232, U-235, U-238 are Radioactive Isotopes - TR2016a
Channel: Thorium Remix
Date: 2017-05-13

http://ThoriumRemix.com/ Thorium has only one isotope, Thorium-232. It has a 14 billion year half-life. Ok, so when the universe is twice as old as it is now, thorium will have only decayed one half-life. So based on what I just told you about radioactivity, what does that tell you about how radioactive thorium is?

Not very.

Kirk Sorensen:
It's hardly at all. Ok, uranium, two isotopes. Uranium-235, Uranium-238, both of course the radioactive. U-238 has a 5 billion year half life. That's pretty old, that's about how old the Earth is. That's how old the earth is, that's how old the universe is. Uranium-235 on the other hand, much shorter half-life, 700 million years.

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