What is a plutonium bomb? What's the difference between plutonium bombs and uranium bombs?

English title: Basic definition of plutonium bomb: Both uranium-235 and plutonium-239 can be used as charges of atomic bombs, and those containing plutonium-239(239Pu) are called plutonium bombs. The charge of uranium bomb is about 15 ~ 25 kg, and that of plutonium bomb is about 5 ~ 10 kg. Plutonium 239 is produced by the reactor. In the reactor, uranium 238 absorbs a neutron and becomes uranium 239 without fission. Uranium 239 decays into neptunium 239, and neptunium 239 decays into plutonium 239. Because plutonium and uranium are different elements, although only a small part of uranium is converted into plutonium, the separation of plutonium and uranium is much easier than the separation between uranium isotopes, so it is more convenient to extract pure plutonium by chemical methods. The technology of uranium bomb is much more complicated than that of plutonium bomb, but in general, plutonium bomb is more powerful than uranium bomb. Because plutonium bombs are not as stable as uranium bombs, and plutonium is extremely toxic, generally capable countries will not make plutonium bombs. But in the past, many countries used plutonium to cross the nuclear threshold (now plutonium is difficult to handle). First, the technology is simple. Second, plutonium can be artificially synthesized by nuclear reaction, but uranium is naturally purified.