Sometimes when diagnosing certain types of diseases, stable atoms in your body are replaced by radioactive atoms of the same element.

Also, those neutrons that were ejected can be used to initiate several other fission reactions.

This 'domino effect' caused by the neutrons is called a chain reaction, and it can be responsible for keeping the reaction going for a long time.

Now, carbon-14 has a half-life of about 5,730 years, so every 5,730 years, half of it is going to decay into nitrogen.

The more carbon-14 that an artifact has, the more recent it is.

Because many things were once living organisms or were once made from living organisms, measuring the percentage of carbon-14 in an artifact is a very reliable way of being able to tell how old the artifact is.

Our next application of nuclear chemistry is in medicine.

The type of nuclear power that is most common on Earth is nuclear fission.

Nuclear fission occurs when a heavier atom splits into smaller pieces.

Radioactive isotopes are used to determine the age of old artifacts, diagnose disease, and treat certain types of medical conditions.