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Thermoluminescence dating limitations and delimitations
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The technique is identical with the wooden sword. Functionality[ edit ] Natural crystalline materials contain imperfections: 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 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.
Depending on the depth of the traps the energy required to free an electron from them the storage time of trapped electrons will vary as some traps are sufficiently deep to store charge for hundreds of thousands of years.
In practical use[ edit ] Another important technique in testing samples from a historic or archaeological site is a process known as Thermoluminescence testing. Which involves a principle that all objects absorb radiation from the environment. This process frees electrons within elements or minerals that remain caught within the item.
Thermoluminescence testing involves heating a sample until it releases a type of light.
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This light is then measured to determine the last time the item was heated. When irradiated crystalline material is again heated or exposed to strong light, the trapped electrons are given sufficient energy to escape.
In the process of recombining with a lattice ion, they lose energy and emit photons light quantadetectable in the laboratory. The amount of light produced is proportional to the number of trapped electrons that have been freed which is in turn proportional to the radiation dose accumulated.
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.