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Violations of this assumption can frequently be identified.
Age determinations by radiocarbon content: Checks with samples of known age. Subsequent revisions have been made, e.g., Reimer, PJ et al. In practice, there are sufficient variations in these conditions that it is necessary to correct a sample’s raw radiocarbon age by comparing it with the standard calibration curve. Carbon-14 dating depends on the amount of atmospheric carbon-14 relative to carbon-12. 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.