Uranium and Thorium Resources
- Cross section
Probability of neutron interaction with a nucleus, expressed in terms of area, in units of barns (b). One barn equals 1.0 × 10−24 cm2.
The fraction of an isotope, usually fissile 235U, in a mass of uranium. Enrichment is commonly quoted as the weight percent of the particular isotope. Natural uranium has an enrichment of 0.711 wt%, commercial reactor fuel is 3–5% enriched, and depleted uranium is 0.2–0.3% 235U.
- Enrichment tails (also depleted uranium)
The uranium remaining after the enrichment of natural uranium into fuel, today about 0.3% 235U and earlier 0.2–0.25% 235U.
Crystallization from a magma in which the initial crystals are prevented from equilibrating from the parent liquid, resulting in a series of residual liquids of more extreme composition than would have resulted from continuous reaction .
An electron antineutrino emitted within the Earth in the β-decay of 232Th, 238U, or 40K and their decay product nuclei.
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