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Carbon dating proven wrong

The cloth has been kept at the cathedral since 1578.

He said the results are the outcome of 15 years of research.

The Telegraph also reports that a new app, sanctioned by the Catholic church and called "Shroud 2.0," allows anyone to use a smart phone or tablet to explore the shroud in detail.

The Vatican, tiptoeing carefully, has never claimed that the 14-foot linen cloth was, as some believers claim, used to cover Christ after he was taken from the cross 2,000 years ago.

Francis, reflecting that careful Vatican policy, on Saturday called the cloth, which is kept in a climate-controlled case, an "icon" -- not a relic.

Hence the growth must incorporate carbon from an external source, and to produce an age shift like that postulated, that source must be the atmosphere, whether by photosynthesis or some other mechanism.

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Accepting that, I can postulate three scenarios that illustrate the problems I have with the theory.The difficulty is that the numbers don't seem to stack up correctly, and a theory that explains away the measured radiocarbon age of the Shroud has to have a quantitative basis since it basically is claiming that a number (the age) derived from an experiment is somehow wrong.Let's start by noting that an organism growing on, and feeding on, the linen threads exclusively will simply re-shuffle the available carbon with no effect on the radiocarbon content.The new examination dates the shroud to between 300 BC and 400 AD, which would put it in the era of Christ.It determined that the earlier results may have been skewed by contamination from fibers used to repair the cloth when it was damaged by fire in the Middle Ages, the British newspaper reported.The burial shroud purports to show the imprint of the face and body of a bearded man.The image also purportedly shows nail wounds at the man's wrist and pinpricks around his brow, consistent with the "crown of thorns" mockingly pressed onto Christ at the time of his crucifixion.This organic material would of course be younger than the linen itself and would not have been removed in pretreatment.As one who earns his crust doing accelerator mass spectrometry radiocarbon dating, I have to say that I have a few problems with the Garza-Valdes & Mattingly theory.As the starting point, assume that the "true" age of the Shroud is 2000 years, and further accept that the measured radiocarbon age (about 600 years) is a good estimate of the radiocarbon that was present in the samples measured. Suppose that the bioplastic layer began at the time the cloth was made (2000 years ago) and has been growing uniformly ever since.Then the carbon in the layer will have an average radiocarbon age of about 1000 years. Suppose that the Shroud remained growth-free right up to around the middle of the 20th century, when some process, or contamination, started the layer growing.

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