uranium 238

uranium 238

noun Chemistry.
the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.
Also called U-238, U 238.


Origin:
1940–45

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uranium 238

noun
the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239 
WordNet® 3.0, © 2006 by Princeton University.
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