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The trapped charge accumulates over time at a rate determined by the amount of background radiation at the location where the sample was buried.
Annual Review of Earth and Planetary Sciences. Most luminescence dating methods rely on the assumption that the mineral grains were sufficiently "bleached" at the time of the event being dated.
Archived from the original on January 3, This article needs additional citations for verification. These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar. Under stimulation of light the electrons may free themselves from the trap and get into the conduction band.
It is used in at least two applications: The total absorbed radiation dose is determined by exciting, with light, specific minerals usually quartz or potassium feldspar extracted from the sample, and measuring the amount of light emitted as a result.
Please help improve this article by adding citations to Teenage internet dating sources. However, the wind-blown origin of these sediments were ideal for OSL dating, as most of the grains would have been completely bleached by sunlight exposure during transport and burial.
For quartz, blue or green excitation frequencies are normally used and the near ultra-violet emission is measured. For beta particles with energies from keV to in excess of 10 MeV, dose measurement ranges from 10 mrem to rem.
Westerly winds delivered an influx of 14 C-deficient carbon from adjacent soils and Paleozoic carbonate rocks, a process that is also active today. In a study of the chronology of arid-zone lacustrine sediments from Lake Ulaan in southern MongoliaLee et al.
Quartz OSL ages can be determined typically from toyears BP, and can be reliable when suitable methods are used and proper checks are done.
There are advantages and disadvantages to using each. The radiation causes charge to remain within the grains in structurally unstable "electron traps". Optically stimulated luminescence dating wiki photons are detected using a photomultiplier tube.
The electrons that have been excited to the conduction band may become entrapped in the electron or hole traps.
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Occasionally other grain sizes are used. March Learn how and when to remove this template message In physicsoptically stimulated luminescence OSL is a method for measuring doses from ionizing radiation. The signal from the tube is then used to calculate the dose that the material had absorbed.
Events that can be dated using OSL are, for example, the mineral's last exposure to sunlight; Mungo ManAustralia's oldest human find, was dated in this manner. The photons of the emitted light must have higher energies than the excitation photons in order to avoid measurement of ordinary photoluminescence.
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