(b) At appropriate sites, electrons are trapped while holes may become localized.
(c) Thermal (TL) or optical (OSL) stimulation of the material results in electrons being evicted from the traps.
Warning about fakes using ancient materials What about airport x-rays and radiography? Thus, when one measures dose in pottery, it is the dose accumulated since it was fired, unless there was a subsequent reheating.
When pottery is fired, it loses all its previously acquired TL, and on cooling the TL begins again to build up.
It is important to note that incandescence is also realized above 400°C during the first heating (redrawn from Ref. Sensitivity ranges for some detectors are also shown. Main methods employed in determining the equivalent dose.
All major accepted dating techniques are included, as well as all major datable materials.
Chapter abstract: Luminescence ages have an uncertainty of at least 4–5 %, mainly due to systematic errors in both dose rate (conversion factors) and equivalent dose (source calibration) estimation.
By comparing this light output with that produced by known doses of radiation, the amount of radiation absorbed by the material may be found.
Most mineral materials, including the constituents of pottery, have the property of thermoluminescence (TL), where part of the energy from radioactive decay in and around the mineral is stored (in the form of trapped electrons) and later released as light upon strong heating (as the electrons are detrapped and combine with lattice ions).