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Some factual corrections (retired professor of physcience here).
For Polonium to be an isotope of Uranium it would have to have the same atomic number (# of protons in its nucleus).
Polonium is an element in its own right: #84 to be precise. Uranium is #92. Uranium undergoes a series of spontaneous decays until it reaches a stable state. For Uranium-238 that stable state is Lead-206 (element #82).
Polonium-210 is a short-lived isotope (half-life 138.39 days), and when it emits an alpha particle (two protons and two neutrons) it becomes Lead-206. Polonium-210 is made by bombarding Bismuth-209 (#83) with neutron in a reactor, which creates Bismuth-210, which has a half-life of 5-days, and by beta-decay becomes Polonium-210. The most stable isotope of Polonium is Polonium-209, which has a half-life of 102-years. Polonium-210 is much more radioactive that Polonium-209.
