(b) A glow-curve from incandescence resulting from the second heating of the sample to a high temperature. Bleaching rates of quartz (q) and feldspar (f) stimulated using TL and OSL (green light) conducted by Godfrey-Smith et al. For the OSL, both quartz and feldspar used a green laser and a detection window of 380 nm which is violet to near-UV . Examples of TL (a, b) and OSL (c, d) emission spectra (adapted with permission from Ref. For TL spectra, the sharp rise in emissions beyond 650 nm is largely from incandescence (rather than from electrons evicted from traps). Main emission wavelengths for quartz and feldspars used in luminescence dating as well as wavelengths employed for stimulation.
It is important to note that incandescence is also realized above 400°C during the first heating (redrawn from Ref. Sensitivity ranges for some detectors are also shown. Main methods employed in determining the equivalent dose.
All major accepted dating techniques are included, as well as all major datable materials.
Chapter abstract: Luminescence ages have an uncertainty of at least 4–5 %, mainly due to systematic errors in both dose rate (conversion factors) and equivalent dose (source calibration) estimation.
(a) A signal yielded after the first heating of a quartz sample with trapped electrons (paleodose). Detection of TL signals was through a window with a center at 400 nm (violet).No other volume has a similar scope, in terms of methods and applications and particularly time range.Dating methods are used to determine the timing and rate of various processes, such as sedimentation (terrestrial and marine), tectonics, volcanism, geomorphological change, cooling rates, crystallization, fluid flow, glaciation, climate change and evolution.(b) At appropriate sites, electrons are trapped while holes may become localized.(c) Thermal (TL) or optical (OSL) stimulation of the material results in electrons being evicted from the traps.