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Carbon dating

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This represents the ideal date for the amount of 14C measured for the sample.

However, as the quantity of 14 absorbed by all life fluctuates from year to year, the figure must be calibrated based on known fluctuation.

The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.

The Great Isaiah Scroll 1QIsa has been tested three times, once by Libby, once at Zurich and once at Tucson.

As a rule, carbon dates are younger than calendar dates: a bone carbon-dated to 10,000 years is around 11,000 years old, and 20,000 carbon years roughly equates to 24,000 calendar years.

The problem, says Bronk Ramsey, is that tree rings provide a direct record that only goes as far back as about 14,000 years.

The results from the latter two were almost identical, which is a good indicator of the basic accuracy of this dating method.

1QS (#15), tested at Zurich, and 4QSam When 4Q258 (#24) was tested at Tucson its result was so anomalous (129-255 or 303-318 CE) that the laboratory was asked to retest another sample from the same document.