Luminescence dating in archaeology from origins to optical Camadultfree

As soon as the mineral is exposed to sunlight, for example during its transport, trapped electrons absorb the photon energy (from the Sun), and are released from the traps.The rate of release depends on four main parameters: i) the kind of mineral: the eviction occurs faster for quartz than for feldspars (reduction of the luminescence signal by a factor of 100 in ~ 20 s for the former, but a few minutes for the latter; Godfrey-Smith , these are more efficient to stimulate and release the electrons.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).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.Hence it underlines the increasing importance of the method to geomorphological research, especially by contributing to the development of quantitative geomorphology.

It is exposed again to radiation and accumulates trapped electrons.Ainsi, l’article souligne l’importance de la méthode pour les recherches en géomorphologie, notamment dans le cadre du développement de la géomorphologie quantitative.Absolute dating methods have been developed over the last five decades (Jull and Scott, 2007).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.

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