Osl Dating Technique

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Optically Stimulated Luminescence - AntarcticGlaciers .org
Optically stimulated luminescence - Wikipedia
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www .antarcticglaciers .org › glacial-geology › dating-glacial-sediments-2 › optically-stimulated-luminescence
Another way of dating glacial landforms is optically stimulated luminescence dating ( OSL ) . OSL is used on glacial landforms that contain sand, such as sandur or sediments in glacial streams . The OSL signal is reset by exposure to sunlight, so the signal is reset to zero while the sand is being transported (such as in a glacial meltwater stream) .
In physics, optically stimulated luminescence ( OSL ) is a method for measuring doses from ionizing radiation . 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
OSL dating is predicated on measurements of a specific mineral and particle size, usually quartz or potassium feldspar . Mineral separations are performed by standard techniques using heavy liquids and hydrofluoric acid (HF) to digest non-quartz minerals and etch the outer 10 to 20 µm of quartz grains which are affected alpha radiation .
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
The technique was first developed in the 1960s, with the aim of dating archeological ceramics to determine the time elapsed since firing (using thermoluminescence, TL, dating ) . In the 1980s, the technique was refined to directly date sediment burial, first using TL signals and later optically stimulated luminescence ( OSL ) signals to establish the timing of the last exposure of sediment to light (Huntley et al ., 1985) . Since then, it has become a widely applied dating technique for . . .
Optically stimulated luminescence: The emission of light from crystalline materials when stimulated by light following previous absorption of energy from radiation Introduction Luminescence dating consists of a family of analytical methods, most of which are used in archaeological research .
Optically Luminescence dating ( OSL ) is one of the state of arts and well-known technique to constrain the timing of identified layers worldwide (e .g ., Fattahi et al ., 2006; Preusser et al ., 2008 . . .
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 .
There are two different methods of OSL dating : multiple-aliquot-dose and single-aliquot-regenerative-dose (SAR) . In multiple-aliquot testing, a number of grains of sand are stimulated at the same time and the resulting luminescence signature is averaged . [4]
Stimulation can be achieved by heating (thermoluminescence or TL) or exposure to light (optically-stimulated luminescence or OSL ) . Luminescence dating has been applied (depending on conditions) from sediments ranging from 10 - 10 6, although more commonly the upper limit is 100-200 ka . It has been applied to aeolian, fluvial, lacustrine, glaciogenic, coastal and marine applications, in addition to a wide range of research in archaeology and art antiquity .
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Osl Dating Technique