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Carbon-14

Oxygen and Carbon-12 are stable, and Carbon-14 is used for dating dead bodies, after they've been dead for a while.....but Uranium results in very long-term radiation.

Ishankahps

Answer is Carbon-14

Radioactive isotopes have half lives. Half life is the time taken by the radioactive isotope to reduce its initial amount by half.

Oxygen-16 and Carbon-12 are stable isotopes of elements O and C respectively. Hence, they do not have half-lives. But Carbon-14
and Uranium-238 are radioactive isotopes. Among them Carbon-14 has relatively short half-life as about 5730 years while Uranium-238 has a long half-life as about 4.5 billion years.

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