Optical luminescence dating laboratory
The method can be applied to several types of sediments (loess, sand dune or coastal, rhythmites, ...) and the period covered potentially extends the current to at least 300,000 years.
In addition, the dating of pottery and prehistoric rocks heated in homes is the essence of the first efforts in thermoluminescence dating.
The optimum peak wavelength giving the best clarity of non-dark adapted vision for the least trapped charge loss lies within the wavelength range 590–630 nm; we argue that it is unnecessary to consider dark-adapted vision.
The predicted relative decay rates of quartz optically stimulated luminescence (OSL) and feldspar infrared stimulated luminescence (IRSL) signals by an incandescent light bulb and a compact fluorescent lamp (CFL) through an ILFORD 902 filter are first derived.
At a number of sites in Chile it has been possible to confirm the validity of these OSL ages by comparison with cosmogenic radionuclide measurements on boulders associated with moraines.
When an electron recombines with a luminescence center L, a photon is emitted.Trapping: Upon exposure to nuclear radiation, some bound electrons of the atoms making up a mineral's lattice are detached from their parent nuclei and become freely mobile: they are said to enter the conduction band.Structural defects in the lattice (vacancies, interstitial atoms, and substitutional impurities) create localized charge deficits, which act as traps T for the conduction electrons.As part of the development of new laboratory lighting, we present a methodological approach applicable to the characterization of any light source intended for illumination in optical dating laboratories.We derive optical absorption cross-sections for quartz and feldspar from published data and compare these with the human eye response.