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The recombination generates the emission of light (the luminescence signal) which can be measured in laboratory through heating (for TL) or through light stimulation for OSL (Huntley ., 1985).The intensity of the signal is proportional to the amount of released 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).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.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 main minerals studied are quartz and K-rich feldspar, which can be found in almost all sedimentary environments.

This phenomenon is associated with a resetting (“zeroing”) of the dosimetric clock; iii) after one or several transport phases the grain is “definitively” buried under a sedimentary cover.

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.

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