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Rachel Wood does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.Australian National University provides funding as a member of The Conversation AU.Radiocarbon dates are presented in two ways because of this complication.The uncalibrated date is given with the unit BP (radiocarbon years before 1950).Isotopes of a particular element have the same number of protons in their nucleus, but different numbers of neutrons.This means that although they are very similar chemically, they have different masses.

This is particularly important for very old samples.The total mass of the isotope is indicated by the numerical superscript.While the lighter isotopes C has decayed that what remains can no longer be measured. In 5,730 years half of the C in the atmosphere, and therefore in plants and animals, has not always been constant.Luckily, we can measure these fluctuations in samples that are dated by other methods.Tree rings can be counted and their radiocarbon content measured.

In the 19th and early 20th century incredibly patient and careful archaeologists would link pottery and stone tools in different geographical areas by similarities in shape and patterning.

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The field of radiocarbon dating has become a technical one far removed from the naive simplicity which characterized its initial introduction by Libby in the late 1940's. 
13-Jan-2019 02:28
Zinc Reduction as an Alternative Method for AMS Radiocarbon Dating Process Optimization at CIRCE 
13-Jan-2019 02:32
Radiocarbon Dating is the process of determining the age of a sample by examining the amount of C-14 remaining against the known half-life, 5,730 years. The reason this process works is because when 
13-Jan-2019 02:36
Radiocarbon dating has transformed our understanding of the past 50,000 years. Professor Willard Libby produced the first radiocarbon dates in 1949 and was later awarded the Nobel Prize for his efforts 
13-Jan-2019 02:40
The age of the earth is normally estimated by radiometric dating. These physical changes also affect the assumptions in radiocarbon dating and ice core dating. 
13-Jan-2019 02:44
There's quite a few, all of which are types of radioactive dating. They include potassium-argon dating, that's useful for rocks over 100,000 years old. There's also uranium-lead dating, which has an age range of 1-4.5 million years old. 
13-Jan-2019 02:48

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Alternatives to radiocarbon dating