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Uranium 238 is transformed in thorium 234 by alpha decay.
It is thorium 234.
The decay of a uranium-238 atom into lead-206 involves the emission of 8 alpha particles. This decay process releases 8 helium-4 (α) particles as the uranium nucleus undergoes multiple decay steps to stabilize as lead-206.
Radium naturally decays into radon, which is a radioactive noble gas. This decay process is one of the steps in the radioactive decay chain of uranium-238.
The daughter nuclide resulting from the decay of uranium-235 through an alpha decay followed by a beta decay is thorium-231.