What are some uses of radioactive isotope?

Answer:

It can be used in medicine, they use a radioactive isotope of a very short half life to help diagnose medical conditions.

Carbon 14 can also be used to date organic material and is determined by the decay rate and comparison of carbon-14 to carbon-12 as carbon-14 is a radioactive isotope and will hence decay at a half life of 5720 years.

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