Uranium-234 is a naturally occurring isotope of uranium, with an atomic mass of 234. It is a product of the decay of Uranium-238 and is found in trace amounts in natural uranium. Uranium-234 is weakly radioactive, with a half-life of about 245,500 years, which means it takes that long for half of a sample to decay. This isotope is significant in the field of nuclear energy and weapons, as it can be used in the enrichment process to produce fuel for nuclear reactors. While it is not as commonly discussed as Uranium-235, it plays a role in the overall behavior of uranium in the environment and in nuclear applications.