Luminescence dating mydatingplace comphoenix
16-Sep-2020 17:41
The flux of ionizing radiation—both from cosmic radiation and from natural radioactivity—excites electrons from atoms in the crystal lattice into the conduction band where they can move freely.Most excited electrons will soon recombine with lattice ions, but some will be trapped, storing part of the energy of the radiation in the form of trapped electric charge (Figure 1).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.
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Thermoluminescence dating (TL) is the determination, by means of measuring the accumulated radiation dose, of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments).
The heating must have taken the object above 500° C, which covers most ceramics, although very high-fired porcelain creates other difficulties.
