Carbon dating shroud of turin 2016 calculating and validating nmea checksums
In 1988, three radiocarbon dating tests dated a sample of the shroud as being from the Middle Ages, Allegations have been made that the sample of the shroud chosen for testing was defective in some way, usually involving questions about the provenance of the threads: for example that the sample chosen was not from the original shroud but from a repair or restoration carried out in the Middle Ages.
Although the quality of the radiocarbon testing itself is unquestioned, criticisms have been raised regarding the choice of the sample taken for testing, with suggestions that the sample may represent a medieval repair fragment rather than the image-bearing cloth.
They concluded that the radiocarbon dating had been performed on a sample of the original shroud material.
They examined a portion of the radiocarbon sample that was left over from the section used by the University of Arizona in 1988 for the carbon dating exercise, and were assisted by the director of the Gloria F Ross Center for Tapestry Studies.
Atkinson wrote in a scientific paper that the statistical analysis of the raw dates obtained from the three laboratories for the radiocarbon test suggests the presence of contamination in some of the samples.
They conclude that: "The effect is not large over the sampled region; …
They viewed the fragment using a low magnification (~30×) stereo microscope, as well as under high magnification (320×) viewed through both transmitted light and polarized light, and then with epifluorescence microscopy.
They found "only low levels of contamination by a few cotton fibers" and no evidence that the samples actually used for measurements in the C14 dating processes were dyed, treated, or otherwise manipulated.
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The Shroud of Turin is a length of linen cloth bearing the negative image of a man who is alleged to be Jesus of Nazareth.