Optically Stimulated Luminescence Dating Technique

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OSL is an acronym for Optically-Stimulated Luminescence . Optically-Stimulated Luminescence is a late Quaternary dating technique used to date the last time quartz sediment was exposed to light . As sediment is transported by wind, water, or ice, it is exposed to sunlight and zeroed of any previous luminescence signal .
Optically stimulated luminescence (OSL) is a technique used to date fossils in geological sediments through ionized radiation to determine the last time a mineral was exposed to sunlight . OSL assumes that minerals were both constantly and sufficiently exposed to oxygen before being buried, noticeably bleaching the observed mineral or fossil .
In physics, optically stimulated luminescence (OSL) is a method for measuring doses from ionizing radiation . It is used in at least two applications: It is used in at least two applications: Luminescence dating of ancient materials: mainly geological sediments and sometimes fired pottery, bricks etc ., although in the latter case thermoluminescence dating is used more often
Improvements of this technique led to the development, for more than twenty years, of the optical dating method [commonly referred to as Optically Stimuled Luminescence (OSL)] which is now applied to sediments from various origins (Wintle, 2008) .
Optical stimulated luminescence (OSL) dating Dr Debabrata Banerjee, School of Geosciences, University of Wollongong, Wollongong, NSW 2522, Australia . Introduction Since the pioneering work by Huntley et al . (1985), optical dating is being increasingly recognised as an important technique for establishing a time frame of deposition of sediments
The dating method of applying optically stimulated luminescence (OSL) was initiated in the mid-1980s under the name "Optical Dating ", the green light emitted by an argon laser was used to excite quartz grains and ages were determined successfully (Huntley et al ., 1985) . Since then,
Two forms of luminescence dating are used by archaeologists to date events in the past: thermoluminescence (TL) or thermally stimulated luminescence (TSL), which measures energy emitted after an object has been exposed to temperatures between 400 and 500°C; and optically stimulated luminescence (OSL), which measures energy emitted after an object has been exposed to daylight .
Types of Luminescence Dating Techniques . Thermal (TL) Optically Stimulated (OSL) Green Light (GSL) - Feldspar & Quartz; Blue Light (BSL) - Quartz; Red Light (RSL) - Volcanic Feldspar & Quartz; Infrared Stimulated (IRSL) (IRSL) post-infrared infrared Stimulated (pIRIR) - Feldspar; Luminescence Age Equation, Equivalent Dose, and Dose Rate . Controlling Assumptions - TL and OSL Method
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 . It includes techniques such as optically stimulated luminescence , infrared stimulated luminescence , and thermoluminescence dating . "Optical dating " typically refers to OSL and IRSL, but not TL .
Through heating (thermoluminescence dating ) or optical stimulation in the case of the optical stimulated luminescence , the trapped electrons recombine and the energy is released by luminescence . The brightness of the luminescence corresponds to the amount of trapped charge, which is a measure of the total ionizing radiation received by the crystal since its last exposure to light ( Aitken, 1998 ) .
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Optically Stimulated Luminescence Dating Technique

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