Beyond that timespan, the amount of the original C formed by irradiation of nitrogen by neutrons from the spontaneous fission of uranium, present in trace quantities almost everywhere.
For these samples, other dating methods must be used.
Carbon-dating Carbon dating, like other radiometric dating methods, requires certain assumptions that cannot be scientifically proved.
These include the starting conditions, the constancy of the rate of decay, and that no material has left or entered the sample.
Such a correlation did not exist across all the samples the authors tested and reported.
That pattern occurred only among the eight diamonds listed in part B of Taylor and Southon’s Table 2.
Carbon-14 dates usually appear to be reasonably accurate whenever they can be checked against historical records.
For example, when the Dead Sea Scrolls were dated, three methods could be used: 1) Dates written in the documents themselves (like the date at the start of a letter) 2) Paleography, which uses the style of script used to write documents to date them, and 3) Carbon-14.
C dating consists of measuring the amounts of carbon-14 and carbon-12, and sometimes C-13, in a sample.The RATE team claims the results have yielded convincing and irrefutable scientific evidence of a young earth.John Baumgardner, a geophysicist with expertise in tectonic modeling, presents experimental data claiming to show that all biological material contains intrinsic radiocarbon, no matter how old that material may be thought to be.This data provides clear evidence that at least a significant fraction of the radiocarbon detected by Taylor and Southon in diamond measurements did not come from the diamonds themselves and thus could not be “intrinsic radiocarbon.” In his 2008 critique Bertsche references the Taylor and Southon (2007) paper describing their application of accelerator mass spectrometry (AMS) to natural diamonds.Bertsche calls attention to the authors’ statement, “The oldest C level with high ion current was restricted to only a subset of the authors’ data.Old-earth creationist Kirk Bertsche has been critical of the RATE work on Carbon-14 dating diamonds, which indicate that they are not billions of years old, but less than 56,000 years (with evolutionary assumptions) and less than 7000 years old (with the correct biblical assumptions).