Uranium-238 | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-03-25

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Uranium-238


00:03:04 1 Nuclear energy applications
00:03:49 1.1 Breeder reactors
00:06:45 1.2 Radiation shielding
00:07:56 1.3 Downblending
00:09:02 2 Nuclear weapons
00:11:38 3 Radium series (or uranium series)
00:22:22 4 Radioactive dating
00:23:43 5 See also



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SUMMARY
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Uranium-238 (238U or U-238) is the most common isotope of uranium found in nature, with a relative abundance of 99%. Unlike uranium-235, it is non-fissile, which means it cannot sustain a chain reaction in a thermal-neutron reactor. However, it is fissionable by fast neutrons, and is fertile, meaning it can be transmuted to fissile plutonium-239. 238U cannot support a chain reaction because inelastic scattering reduces neutron energy below the range where fast fission of one or more next-generation nuclei is probable. Doppler broadening of U-238's neutron absorption resonances, increasing absorption as fuel temperature increases, is also an essential negative feedback mechanism for reactor control.
Around 99.284% of natural uranium's mass is uranium-238, which has a half-life of 1.41×1017 seconds (4.468×109 years, or 4.468 billion years).
Due to its natural abundance and half-life relative to other radioactive elements, 238U produces ~40% of the radioactive heat produced within the Earth.  238U decay contributes 6 electron anti-neutrinos  per decay (1 per beta decay), resulting in a large detectable geoneutrino signal when decays occur within the Earth.  The decay of 238U to daughter isotopes is extensively used in radiometric dating, particularly for material older than ~ 1 million years.
Depleted uranium has an even higher concentration of the 238U isotope, and even low-enriched uranium (LEU), while having a higher proportion of the uranium-235 isotope (in comparison to depleted uranium), is still mostly 238U. Reprocessed uranium is also mainly 238U, with about as much uranium-235 as natural uranium, a comparable proportion of uranium-236, and much smaller amounts of other isotopes of uranium such as uranium-234, uranium-233, and uranium-232.