luminescence procedures), and literature citations to the original data source.This paper discusses the background to the project, the concept and structure of the chronologic database that forms its core, and gives some examples of the scope of the database and ways in which it can contribute to greater understanding of the spatial and temporal variability in dune development.
The database comprises information on the site location (including coordinates), dune type, and stratigraphic context, pertinent analytical information (e.g.
In order to relate the signal (the thermoluminescence—light produced when the material is heated) to the radiation dose that caused it, it is necessary to calibrate the material with known doses of radiation since the density of traps is highly variable.
Thermoluminescence dating presupposes a "zeroing" event in the history of the material, either heating (in the case of pottery or lava) or exposure to sunlight (in the case of sediments), that removes the pre-existing trapped electrons.
These imperfections lead to local humps and dips in the crystalline material's electric potential.
Where there is a dip (a so-called "electron trap"), a free electron may be attracted and trapped.
The clay core of bronze sculptures made by lost wax casting can also be tested.