Luminescence dating definition
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Measurement of N, the number of 14 C atoms currently in the sample, allows the calculation of t, the age of the sample, using the equation above. The above calculations make several assumptions, such as that the level of 14 C in the atmosphere has remained constant over time. The calculations involve several steps and include an intermediate value called the "radiocarbon age", which is the age in "radiocarbon years" of the sample: Radiocarbon ages are still calculated using this half-life, and are known as "Conventional Radiocarbon Age".
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The following are types of luminescence: Chemiluminescence , the emission of light as a result of a chemical reaction Bioluminescence , a result of biochemical reactions in a living organism Electrochemiluminescence , a result of an electrochemical reaction Lyoluminescence , a result of dissolving a solid usually heavily irradiated in a liquid solvent Candoluminescence , is light emitted by certain materials at elevated temperatures, which differs from the blackbody emission expected at the temperature in question. Electroluminescence , a result of an electric current passed through a substance Cathodoluminescence , a result of a luminescent material being struck by electrons Mechanoluminescence , a result of a mechanical action on a solid Triboluminescence , generated when bonds in a material are broken when that material is scratched, crushed, or rubbed Fractoluminescence , generated when bonds in certain crystals are broken by fractures Piezoluminescence , produced by the action of pressure on certain solids  Sonoluminescence , a result of imploding bubbles in a liquid when excited by sound Photoluminescence , a result of absorption of photons Fluorescence , photoluminescence as a result of singlet —singlet electronic relaxation typical lifetime:
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