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TL dating is a matter of comparing the energy stored in a crystal to what "ought" to be there, thereby coming up with a date-of-last-heated.
In the same way, more or less, OSL (optically stimulated luminescence) dating measures the last time an object was exposed to sunlight.
He was the European co-ordinator for the IGCP-253 Termination of the Pleistocene ‘North Atlantic Seaboard Program’ (1990-1994), and co-founder, in 1995 of INTIMATE (Integration of Ice core, Marine and Terrestrial Records), now a core program of the INQUA (International Union for Quaternary Research) Palaeoclimate Commission. However, human beings love to see factual precision, and we want to know how old something is.Please remember that all dating methods, even those termed "absolute," are subject to margins of error. That is a very small amount of possible error range. Modern studies almost always use two or more methods to confirm dating work and to build confidence in the results obtained.Pollen samples from 3 tidal wetlands were taken from levels dated with 137Cs and 210Pb profiles.Pollen dates from 2 additional wetlands were compared with 14C dates of botanical macrofossils.
This energy is lodged in the imperfect lattices of the mineral's crystals.