Thermoluminescence dating dictionary
Thermoluminescence TL dating 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. As the material is heated, during measurements, thermoluminescence , a weak light signal, is emitted, proportional to the radiation dose absorbed by the material. Natural crystalline materials contain imperfections: impurity ions , stress dislocations, and other phenomena that disturb the regularity of the electric field that holds the atoms in the crystalline lattice together. This leads to local humps and dips in its electric potential.
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status date in Indonesian - English-Indonesian Dictionary | Glosbe
The designation or indication in an instrument of writing, of the time, and usually of the time and place, when and where it was made. When the place is mentioned in the date of a deed, the law intends, unless the contrary appears, that it was executed at the place of the date. This word is derived from the Latin datum, because when deeds and agreements were written in that language, immediately before the day, month and year in which they were made, was set down, it was usual to put the word datum, given. All writings ought to bear a date, and in some it is indispensable in order to make them valid, as in policies of insurance; but the date in these instruments is not inserted in the body of the writing because as each subscription makes a separate contract, each underwriter sets down the day, month and year he makes his subscription. Deeds, and other writings, when the date is an impossible one, take effect from the time of deliver; the presumption of law is, that the deed was dated on the day it bears date, unless, as just mentioned, the time is impossible; for example, the 32d day of January.
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Scientists in North America first developed thermoluminescence dating of rock minerals in the s and s, and the University of Oxford, England first developed the thermoluminescence dating of fired ceramics in the s and s. During the s and s scientists at Simon Frasier University, Canada, developed standard thermoluminescence dating procedures used to date sediments. In , they also developed optically stimulated luminescence dating techniques, which use laser light, to date sediments. The microscopic structure of some minerals and ceramics trap nuclear radioactive energy.
Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating. It is useful to geologists and archaeologists who want to know when such an event occurred. It uses various methods to stimulate and measure luminescence. All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium , uranium , thorium , and rubidium. These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar.
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