Dictionary
uranium 238
noun
Definition of URANIUM 238
: an isotope of uranium of mass number 238 that is the most stable uranium isotope, that constitutes over 99 percent of natural uranium, that is not fissile but can be used to produce a fissile isotope of plutonium, and that has a half-life of 4.5 billion years
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First Known Use of URANIUM 238
1942
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