What is the half life of uranium 238?

Uranium-238, the most prevalent isotope in uranium ore, has a half-life of about 4.5 billion years; that is, half the atoms in any sample will decay in that amount of time. read more

Around 99.284% of natural uranium is uranium-238, which has a half-life of 1.41×1017 seconds (4.468×109 years, or 4.468 billion years). Due to its natural abundance and half-life relative to other radioactive elements, 238 U {\displaystyle ^{238}U} produces ~40% of the radioactive heat produced within the Earth. read more

Uranium 238 decays via alpha decay to 234 Th. Half-life of uranium 238 is ~4.5×10 9 years. Uranium 238 occasionally decays by spontaneous fission with probability of 0.000055%. read more