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Is carbon dating real

By radiocarbon dating a piece of wood which has been dated by counting the annual growth rings of trees back to when that piece of wood grew, a calibration table can be constructed to convert radiocarbon years to true calendar years.

Of course, the table, so constructed, will only give the correct calibration if the tree-ring chronology which was used to construct it had placed each ring in the true calendar year in which it grew.

For example, a sample with a true radiocarbon age of 100,000 radiocarbon years will yield a measured radiocarbon age of about 20,000 radiocarbon years if the sample is contaminated with a weight of modern carbon of just 5% of the weight of the sample's carbon.

It is not too difficult to supply contaminating radiocarbon since it is present in relatively high concentrations in the air and in the tissues of all living things including any individuals handling the sample.

The problem with freshwater clams arises because these organisms derive the carbon atoms which they use to build their shells from the water in their environment.

Long tree-ring chronologies are rare (there are only two that I am aware of which are of sufficient length to be of interest to radiocarbon) and difficult to construct.

They have been slowly built up by matching ring patterns between trees of different ages, both living and dead, from a given locality.

For this reason special precautions need to be exercised when sampling materials which contain only small amounts of radiocarbon.

Reports of young radiocarbon ages for coal probably all stem from a misunderstanding of one or both of these two factors.

463 comments

  1. 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. It is, therefore, not surprising that many misconceptions about what radiocarbon can or cannot do and what it has or has not shown are prevalent among.

  2. Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon 14. C, a radioactive isotope of carbon. The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists. Libby received the Nobel Prize.

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