Carbon dating kids
You might be wondering how we know that the Iceman is more than 5,000 years old. Carbon dating is a way of telling the age of a once living thing by measuring the amount of carbon inside of it.
Histories of archaeology often refer to its impact as the "radiocarbon revolution".The results were summarized in a paper in Science in 1947, in which the authors commented that their results implied it would be possible to date materials containing carbon of organic origin.Libby and James Arnold proceeded to test the radiocarbon dating theory by analyzing samples with known ages.Measurement of radiocarbon was originally done by beta-counting devices, which counted the amount of beta radiation emitted by decaying atoms in the sample and not just the few that happen to decay during the measurements; it can therefore be used with much smaller samples (as small as individual plant seeds), and gives results much more quickly.The development of radiocarbon dating has had a profound impact on archaeology.Did you ever wonder how scientists know a fossil is 10,000 years old or a piece of paper is 2,000 years old? In this lesson you'll learn about carbon dating and how it works.
Imagine going for a hike in the mountains and finding a 5,000-year-old body frozen in a block of ice!
The method was developed in the late 1940s at the University of Chicago by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960.
It is based on the fact that radiocarbon ( in a sample from a dead plant or animal such as a piece of wood or a fragment of bone provides information that can be used to calculate when the animal or plant died.
They synthesized Libby and several collaborators proceeded to experiment with methane collected from sewage works in Baltimore, and after isotopically enriching their samples they were able to demonstrate that they contained .
By contrast, methane created from petroleum showed no radiocarbon activity because of its age.
For example, two samples taken from the tombs of two Egyptian kings, Zoser and Sneferu, independently dated to 2625 BC plus or minus 75 years, were dated by radiocarbon measurement to an average of 2800 BC plus or minus 250 years. Carbon dioxide produced in this way diffuses in the atmosphere, is dissolved in the ocean, and is taken up by plants via photosynthesis.