Optically stimulated luminescence dating cost
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To put it simply, certain minerals (quartz, feldspar, and calcite), store energy from the sun at a known rate.
This energy is lodged in the imperfect lattices of the mineral's crystals.
Consequently, samples analysed without consideration of their water content or using a low estimate of water content will return ages younger than samples corrected for this effect.
For instance, a sample with an actual water content of 44% giving an age of 40Ka dated using a water content value of 30% may give a false age of 31Ka (the precise values depend on the details of the sediment chemistry).
The method is routinely applied to sediments as old as 250Ka and, consequently, is ideal for dating material beyond the range of 14C dating (A short length of undisturbed core is sub sampled in a dark room to extract a few grams of sediment.
TL dating is a matter of comparing the energy stored in a crystal to what "ought" to be there, thereby coming up with a date-of-last-heated.The luminescence of each sample is measured using industry-standard Luminescence Readers (manufactured by Risoe National Laboratories, Denmark) which incorporate 90Sr beta-sources, and 470nm LED optical stimulation.The total absorbed dose (termed De, measured in units of Gy) is measured using standard luminescence dating procedures (Murray and Wintle, 2000).The corresponding Equivalent dose is calculated by reading it down to the x-axis. where there is still scope for much more charge accumulation) the interpolation is simple as illustrated in Figure 1a.If the sample is relatively old then the interpolation of the natural value is at relatively high positions on the OSL axis because it is near a state of saturation as illustrated in Figure 1b.
Strata Data offers a dating service using the Optically Stimulated Luminescence (OSL) technique.