Compared to conventional radiocarbon techniques such as Libby's solid carbon counting, the gas counting method popular in the mid-1950s, or liquid scintillation (LS) counting, AMS permitted the dating of much smaller sized samples with even greater precision.
Regardless of the particular 14C technique used, the value of this tool for archaeology has clearly been appreciated.
(the latest possible date) are the terms that are used for this. Each artefact will have numbers attached telling you exactly where it came from. As most finds can’t be scientifically dated in the lab (or it would be insanely expensive or destructive to do so) a rough date is given by the startigraphy. Over the many centuries (and yes I mean centuries) that archaeology has been studied we have a pretty good knowledge of what forms and types of vessels were made and when they were made. Being the people we are and due to the nature of archaeology this is all recorded. The specialists may be able to give more specific dates depending on the object and its rarity. The date then narrows to the reign of that Emperor or possibly slightly afterwards depending on the relation to the new Emperor.
Those dates are consulted and the fabrics identified to say where and when a piece was likely made. A statue of a Roman emperor could not have been made before that emperor existed. Coins can also be dates because they have dates on them.
Not all are what you would consider scientific dating methods.
Scientific dating can be expensive; especially when there are large amounts of artefacts.
This isn’t always the case but in general there is some form of specific dating linked at least to a ruler for most coinage. These divide artefacts in a set category by style and fabric etc.
Radiocarbon dating was the first chronometric technique widely available to archaeologists and was especially useful because it allowed researchers to directly date the panoply of organic remains often found in archaeological sites including artifacts made from bone, shell, wood, and other carbon based materials.A large part of an archaeologists job is recording the different layers of soil and their relation to each other. These will be in features, natural features are rarely excavated although it does happen.When you dig something up you will know how deep it is in a feature and also if that feature is below anything else. Take a look at the following picture:)This is stratigraphy.The introduction of "old" or "artificial" carbon into the atmosphere (i.e., the "Suess Effect" and "Atom Bomb Effect", respectively) can influence the ages of dates making them appear older or younger than they actually are.This is a major concern for bone dates where pretreatment procedures must be employed to isolate protein or a specific amino acid such as hydroxyproline (known to occur almost exclusively in bone collagen) to ensure accurate age assessments of bone specimens.
However, there are a number of other factors that can affect the amount of carbon present in a sample and how that information is interpreted by archaeologists.