Polonium is a metal found in uranium ore whose isotope polonium-210 is highly radioactive, emitting tiny positively charged alpha particles. read more
Expert: Radiation poisoning from polonium-210 looks like the end stage of cancer Whether a radioactive substance called polonium-210 was involved in Yasser Arafat's death is under investigation. The body of the former Palestine Liberation Organization leader was exhumed Tuesday for this purpose and reburied. read more