from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The uranium isotope with mass number 235 and half-life 7.04 × 108 years, fissionable with slow neutrons and capable in a critical mass of sustaining a chain reaction that can proceed explosively with appropriate mechanical arrangements.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics An isotope of uranium, used for energy generation and in atomic weapons, containing one hundred and forty-three neutrons. It has a half-life of 7·038×108 years, whereupon it decays into thorium-231.


from Wiktionary, Creative Commons Attribution/Share-Alike License

uranium + 235 the atomic mass of this isotope.



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