Radioactive dating how stuff works

Absolute dating represents the absolute age of the sample before the present.

Historical documents and calendars can be used to find such absolute dates; however, when working in a site without such documents, it is hard for absolute dates to be determined.

In a stratigraphical context objects closer to the surface are more recent in time relative to items deeper in the ground.

Although relative dating can work well in certain areas, several problems arise.

There are two techniques for dating in archaeological sites: relative and absolute dating.

Relative dating stems from the idea that something is younger or older relative to something else.

More recently is the radiocarbon date of 1950 AD or before present, BP.

Looking at the graph, 100% of radiocarbon in a sample will be reduced to 50% after 5730 years.

In 11,460 years, half of the 50% will remain, or 25%, and so on.

The Greeks consider the first Olympic Games as the beginning or 776 BC.

The Muslims count the Prophet’s departure from Mecca, or the Hegira, as their beginning at AD 662.

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