For historical reasons, uncalibrated radiocarbon measurements are often referred to a half-life of 5568 years.However, this inconsistency is corrected during calibration [the reason for using the (Willard F.) Libby half-life of 5568 years instead of the correct one of 5730 years has to do with the finding in about 1962 that the true half-life was 573030 years.About one carbon nucleus in a trillion contains two extra neutrons, giving a mass of 14.This carbon-14 is radioactive and decays with a half-life of 5730 years. Accelerator mass spectrometry (AMS) is a technique for direct measurement of the concentration of radioisotopes.A radiocarbon measurement can be obtained on a sample of ~0.5 mg of carbon, and measured to 40 years in uncalibrated radiocarbon age in a measurement time of 3040 minutes on each sample.This website also gives you some general information on Radiocarbon Dating, Links to different institutions and a Bibliography.If you have any questions or hints, please Contact us or see under How to use...
Since nearly all applications where the precise age is needed require calibration, this difference is removed in the calibration process].
This is a database in progress, of course many more textiles have been radiocarbon dated/ historical-dated than appeare here so far.
Here you will find some explanations on the single columns - for those using the data as well as for those feeding the columns with new results of datings.
Note: Responsable for the contents of the table are the persons who submitted the information.
We do not change any classification as, for example, "medieval", "tabby" or similar.