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01-Jun-2016 17:19

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Where partial or heterogeneous bleaching of the optical dating signal is indicated, we recommend that single-grain dating be employed and the burial dose estimated from the population of grains with the lowest absorbed radiation dose.At Wadi Sabra (SW Jordan) human occupation dates back to the Palaeolithic and Epipalaeolithic.It is useful to geologists and archaeologists who want to know when such an event occurred.It uses various methods to stimulate and measure luminescence It includes techniques such as optically stimulated luminescence (OSL), infrared stimulated luminescence (IRSL), and thermoluminescence (TL).

The precision and accuracy of the technique, which has the potential to date sediments deposited during the last 500,000 years or so, is limited by the random and systematic uncertainties associated with producing optical ages."Optical dating" typically refers to OSL and IRSL, but not TL.All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.The IRSL signals from the polymineral fine grains yield an equivalent dose (De) of 3-4 Gy, while a De of 0.3-0.6 Gy was measured using large aliquots of quartz.

Small aliquot analyses of 63-90 μm and 212-250 μm quartz grains confirm that the coarser fraction contains more grains with lower De’s.

The single-grain optical ages are shown to be consistent with AMS radiocarbon ages obtained from planktonic foraminifera from the same core.