Carbon dating faq
Carbon-14 dating does not produce ages in the millions of years, as do some other types of radioisotope dating.C dating consists of measuring the amounts of carbon-14 and carbon-12, and sometimes C-13, in a sample.In most cases, the three methods produced similar results.Surprisingly, in at least one case the date range given by There may be other examples of systematic variation in isotope decay rates.Why do ancient samples of coal, diamonds and other carbon-containing materials consistently contain  The first such curve was published by: Arnold, JR and WF Libby. High-precision (super 14C measurement of Irish oaks to show the natural 14C variations from AD 1840 to 5210 BC. Age determinations by radiocarbon content: Checks with samples of known age. Subsequent revisions have been made, e.g., Reimer, PJ et al. It is widely used in dating fossils or archaeological samples containing organic material such as wood, charcoal, bone, shells, etc.It is not used to date rocks or other inorganic material.
Also, there is a lag time for atmospheric mixing in the northern and southern hemispheres which results in somewhat different ages for the two hemispheres.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.Carbon-14 dating cannot be applied to materials that have no C dates are less than that figure.It is sometimes thought possible to extend the dating range a few half-lives, so one occasionally sees dates as old as 70,000 years or more.
A final assumption is that the various rates of flow of carbon-14 among the respective geophysical reservoirs must be constant, and the residence time of carbon-14 in the various reservoirs must be short relative to its half-life. (Riverside, CA: La Sierra University Press, 1997), 183. Carbon-14 dating models and experimental implications. Origins 24(2, 1997):50-64  The deep ocean waters are estimated to take about 1000 years to circulate back to the surface: Aitken, MJ.