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The dating limit of a particular luminescence method depends on signal saturation and its thermal stability. The OSL signal saturates at doses of Gy, equivalent to ages of ka.
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Regarding thermal stability, different studies report a wide range of estimates 0. Here, we investigated the dating limit of TT-OSL, using quartz of Nilotic origin Israelobtained from two sediment sections of similar depth but different dose rates.
In both sections, luminescence intensity grows sub-linearly up to Gy, beyond which it remains constant with depth.
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The absence of equivalent doses De over Gy, at both sections as well as elsewhere regionallysuggest that TT-OSL signal saturation may be an intrinsic property, related to quartz provenance, and independent of the specific ionizing dose rate at each section.
The thermal stability of TT-OSL was investigated on a modern sample from one section, using a combination of analytical techniques varying heating rates, and isothermal storage.
The obtained TT-OSL lifetimes range between ka, and reinforce a significant inter sample variability. A synthesis of our results suggests that TT-OSL ages of Nilotic quartz derived from De values over Gy, are likely underestimates, and should be treated as minimum ages.
The limiting value of Gy for local quartz TT-OSL is likely representative of a steady-state between TT-OSL trap filling due to ionizing radiation, and the concurrent thermal empting of these traps.