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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. Therefore, at that point the thermoluminescence signal is zero. As time goes on, the ionizing radiation field around the material causes the trapped electrons to accumulate Figure 2.
In the laboratory, the accumulated radiation dose can be measured, but this by itself is insufficient to determine the time since the zeroing event. The Radiation Dose Rate - the dose accumulated per year-must be determined first. This is commonly done by measurement of the alpha radioactivity the uranium and thorium content and the potassium content K is a beta and gamma emitter of the sample material. Often the gamma radiation field at the position of the sample material is measured, or it may be calculated from the alpha radioactivity and potassium content of the sample environment, and the cosmic ray dose is added in.
Once all components of the radiation field are determined, the accumulated dose from the thermoluminescence measurements is divided by the dose accumulating each year, to obtain the years since the zeroing event. Thermoluminescence dating is used for material where radiocarbon dating is not available, like sediments.
Its use is now common in the authentication of old ceramic wares, for which it gives the approximate date of the last firing.
An example of this can be seen in Rink and Bartoll, Thermoluminescence dating was modified for use as a passive sand migration analysis tool by Keizars, et al. Optically stimulated luminescence dating is a related measurement method which replaces heating with exposure to intense light. The sample material is illuminated with a very bright source of green or blue light for quartz or infrared light for potassium feldspars.
Ultraviolet light emitted by the sample is detected for measurement. From Wikipedia, the free encyclopedia. This article includes a list of references , but its sources remain unclear because it has insufficient inline citations. Please help to improve this article by introducing more precise citations. October Learn how and when to remove this template message.source link
Luminescence dating - Wikipedia
Canon of Kings Lists of kings Limmu. Chinese Japanese Korean Vietnamese. Lunisolar Solar Lunar Astronomical year numbering. Deep time Geological history of Earth Geological time units. Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating.
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Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating. Fluorine absorption Nitrogen dating Obsidian hydration Seriation Stratigraphy. Retrieved from " https: Dating methods Luminescence Conservation and restoration. Webarchive template wayback links Articles lacking in-text citations from October All articles lacking in-text citations All articles with dead external links Articles with dead external links from August Articles with permanently dead external links Articles with dead external links from June Views Read Edit View history.
We describe data on the thermoluminescence TL of ocean sediments which leads us to propose that exposure to sunlight prior to deposition reduces any previously acquired TL to a small "residual" value.
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Subsequent radiation from radionuclides in the sediment increases the TL and this increase is used for dating. Three methods of separating these two TL components are described.
An equation relating this dose to the age and to dose rates derived from radioactivity analyses is presented. The TL age uncertainty is primarily set by the uncertainty in the water content.
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Lian , Jinsheng Hu , D. Huntley , Stephen R.