Carbon 14 in archaeological dating haitian dating
By comparing age of a sample deduced by using carbon-14 dating to results from other dating techniques, discrepancies have been noticed.► With the advancement of nuclear reactors and weapons, it is possible that the amount of carbon-14 has changed in the recent years, specially carbon data from the 1950s and 1960s are questionable.
There is also the likelihood of the sample being contaminated with old or new carbon.
Since carbon-12 doesn't naturally decay while carbon-14 does, once a creature stops incorporating more carbon into its body, the ratio of carbon-12 to carbon-14 in its body begins to change, with less carbon-14 per carbon-12 as time passes.
Since creatures incorporate carbon-12 and carbon-14 into their bodies at about the same ratio as it occurs in the atmosphere during their lifetimes, by looking at the ratio in the atmosphere today and by comparing it to the ratio as it is found in the specimen we are examining, we are able to determine when the specimen stopped consuming more carbon-14 (i.e. This is, of course, assuming that we know how long it takes for carbon-14 to decay and that we know that the ratio of carbon-12 to carbon-14 in the atmosphere today is about the same as if was during the creature's lifetime.
For example, logs of woods cut from different trees were burnt in a fireplace.
The first assumption is fairly reasonable, though some scientists have recently called into question whether or not nuclear decay rates were accelerated in the past (this might change the rate of carbon-14 decay).
Radiocarbon dating is a key tool archaeologists use to determine the age of plants and objects made with organic material.