Uranium-232 is a radioactive isotope of uranium, with a mass number of 232. It is produced naturally in trace amounts through the decay of thorium-232 and can also be generated in nuclear reactors. Uranium-232 has a half-life of about 68.9 years, making it relatively stable compared to other isotopes. This isotope is significant in the context of nuclear energy and nuclear weapons because it can be used in breeder reactors to produce plutonium-233. However, uranium-232 is also a concern due to its high gamma radiation, which poses challenges for handling and storage.