Prior to the final depositional episode it is necessary that any previously acquired TL is removed by exposure to sunlight.
After burial the TL begins to build up again at a rate dependent upon the radiation flux delivered by long-lived isotopes of uranium, thorium and potassium.
As a result, there is no upper date limit set by the sensitivity of the method itself, although other factors may limit the method's feasibility.
Reliability of age: reliability of technique and association How to know full or absolute age in years before present of different parts of the sequence. Assignment of an age to a physical remain based on direct analysis of that physical remain.
Reliability of age = reliability of technique Two artifacts are buried at the same time within the same archaeo.
to frequencies of their co-occurrence in specific contexts Ordering of physical remains in a series so that adjacent items in the series are more similar to each other than items farther apart. Relies on principally measuring changes in proportional abundance, or frequency, of ceramic style.
Ordering of artifacts according to their frequencies so that the distribution conforms to a "battleship-shaped" curve.