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For example, look at this image of the opening of King Tutankhamen's tomb near Luxor, Egypt during the 1920s.
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The technique used is called carbon dating, and in this lesson we will learn what this is and how it is used. Carbon dating, or radiocarbon dating, is a method used to date materials that once exchanged carbon dioxide with the atmosphere. In the late 1940s, an American physical chemist named Willard Libby first developed a method to measure radioactivity of carbon-14, a radioactive isotope.
Libby was awarded the Nobel Prize in chemistry for his work in 1960.
Once they die, they stop taking in carbon-14, and the amount present starts to decrease at a constant half-life rate.
Then the radiocarbon dating measures remaining radioactivity.
This is why radiocarbon dating is only useful for dating objects up to around 50,000 years old (about 10 half-lives).