The individual laboratory code number, which is prefixed to radiocarbon measurements from that particular lab.
Thus, ANU-3546 refers to sample 3546 measured at the Radiocarbon Laboratory at the Australian National University, for example.
Some of the problems associated with interpreting the corpus of radiocarbon data obtained thus far concern variation in reporting.
These may be involved with uncertain reservoir corrections, especially for shell dates, corrections for isotopic fractionation and failure to specify whether the old or new half-life was used.
In many instances, researchers have in recent decades, neglected to publish relevant data describing the sample, laboratory and reference numbers, provenance and reservoir correction details.
Such practices seriously undermine the value of radiocarbon dates because they lack a meaningful context.
The Mayan calendar used 3114 BC as their reference.
More recently is the radiocarbon date of 1950 AD or before present, BP.
They have the same ratio of carbon-14 to carbon-12 as the atmosphere, and this same ratio is then carried up the food chain all the way to apex predators, like sharks.The paper “Phytolith Radiocarbon Dating in Archaeological and Paleoecological Research: A Case Study of Phytoliths from Modern Neotropical Plants and a Review of the Previous Dating Evidence” by Dolores R.Piperno presents radiocarbon analysis of phytoliths from modern Neotropical plants collected between 19.Atoms of the same element that have different numbers of neutrons are called isotopes. Most carbon on Earth exists as the very stable isotope carbon-12, with a very small amount as carbon-13.Here’s an example using the simplest atom, hydrogen. Carbon-14 is an unstable isotope of carbon that will eventually decay at a known rate to become carbon-12.