Luminescence dating in archaeology from origins to optical netdating dk Sorø

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The latter were first applied to burned minerals from archaeological artefacts [thermoluminescence (TL) method].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).Some of the traps are considered ‘unstable’ (“shallow traps”), which means that an electron inside will not remain trapped for the whole duration of burial.On the contrary, defects situated deeper inside the lattice have a higher thermal lifetime.These “deep traps” (stable traps associated with high energy levels) can adequately be used for dating.The total amount of trapped electrons within a crystal is proportional to the total energy absorbed and retained by the crystal (or dose), hence the time it was exposed to radiation.The radiation () comes from radionucleides which are present in the mineral and its natural environment, mainly uranium, thorium (and their decay products), potassium, and for a small proportion from cosmic particles (Aitken, 1985).They lead to the emission of electrons which are subsequently trapped in crystalline lattice defects.

luminescence dating in archaeology from origins to optical-68

luminescence dating in archaeology from origins to optical-54

luminescence dating in archaeology from origins to optical-44

L’objectif de cet article est de proposer une présentation d’ensemble des méthodes de datations par luminescence stimulée optiquement (OSL) et de leurs applications dans le champ des recherches en géomorphologie.

Feldspars have the specificity of being sensitive both to short and to near-infrared or infrared wavelength (800-950 nm; Bøtter-Jensen ., 1994); iv) the sensitivity of the trap to light.

Released electrons can recombine with another kind of crystalline defects (“holes” reflecting electrons vacancies).

Après une présentation des principes physiques généraux, les procédures mises en œuvre aussi bien sur le terrain qu’en laboratoire sont abordées, à partir de l’exemple des analyses réalisées sur des alluvions sableuses issues d’une basse terrasse de la Moselle.

La place des datations OSL dans la recherche géomorphologique en France et son potentiel pour les recherches futures sont décrits à travers une présentation de la diversité des environnements sédimentaires et des problématiques pouvant être traités.

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