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1. General
1.1 Uranium isotopes
Natural uranium is a mixture of isotopes with different nuclear properties. It contains 0.72% atoms of the isotope 235 U, 99.274 5% atoms of 238 U and, in radioactive equilibrium with the latter, 0.005 5% of 234 U. The half-lives of 235 U and 238 U are 7.1 × 10 8 and 4.5 × 10 9 years respectively, long enough to explain their presence in the earth's crust.
It is the 235 U isotope...
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USEC Inc. http://www.usec.com/
Nuclear Regulatory Commission http://www.nrc.gov/
Uranium Information Centre http://www.uic.com.au/
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