Result from a comparison of UV and sunlight bleaching of feldspar and quartz

Jungner, H.

doi:10.1016/0277-3791(88)90024-8

Cited by 9 publications

(2 citation statements)

References 3 publications

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“…The uncertainty in determining the correct residual level reached at the time of sedimentation is the major source of error in the dates obtained (Jungner 1988). The stable behavior of the equiv- alent dose (ED) obtainedin the temperature interval 320°400" C, where the main TL signal can be observed ( Fig.…”

Section: Bleaching and Measurementsmentioning

confidence: 99%

Thermoluminescence dates of Weichselian sediments in western Norway

Jungner

Landvik

Mangerud

1989

Boreas

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Thermoluminescence dating has been carried out on feldspar sand grains from the distal sandur of the Godøya Formation and correlated sediments at Sunnmøre, western Norway. The accumulated dose was determined by the regeneration method. The Godøya Formation, which was earlier assumed to be of Middle Weichselian age, was dated to 105–130 ka and is now assumed to postdate immediately the Eemian interglacial. Dates of sediments previously correlated to the Godøya Formation yielded ages in the ranges of 70–90 and 40–50 ka, thus indicating at least three Weichselian ice‐free periods predating the Ålesund interstadial in the area.

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Section: Bleaching and Measurementsmentioning

confidence: 99%

Thermoluminescence dates of Weichselian sediments in western Norway

Jungner

Landvik

Mangerud

1989

Boreas

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“…Erasing kinetics and residual TL depend on several factors including: nature of the minerals, exposure conditions and duration, light spectrum (e.g., Gemmel, 1985, Jungner, 1988, Spooner et al, 1988, Rendell et al, 1994. Recently, Westaway and Roberts (2006), using a regenerativedose protocol, assessed that the residual Red-TL of quartz preliminary annealed by heating was also correlated to the radiation dose acquired before bleaching.…”

Section: Introductionmentioning

confidence: 99%

Residual thermoluminescence for sun-bleached quartz: Dependence on pre-exposure radiation dose

Miallier

Sanzelle

Pilleyre

et al. 2006

Quaternary Geochronology

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Quartz grains zeroed by heat and subsequently irradiated -either in the laboratory, or naturally in volcanic deposits -were exposed to sunlight for several months prior to TL measurements. As a result, the residual TL, either Blue or Red, appeared to grow significantly with the radiation-dose experienced by the grains since zeroing. In another experiment, un-heated sedimentary quartz grains, sampled at the very surface of a coastal sand-dune, were irradiated and subsequently exposed to sunlight before TL measurements.The residual Red-TL still exhibited a strong dose-dependence, but at a level which was higher than the natural signal. Finally, it was concluded that the so-called "un-bleachable TL" is not a constant, intrinsic data, for a given quartz sample.Because the residual TL is strongly correlated to the radiation dose experienced since the last zeroing by heat, it can theoretically be quoted in terms of "dose", as sometimes done.However, this raises the question of its correct evaluation, and, on the other hand, there is a risk of misinterpretation of its physical meaning in the case of un-heated sediments.In the context of sediment dating, the experimentally-estimated residual signal that is routinely subtracted from the total signal for palaeodose estimation is therefore higher than the signal that would have been measured prior to burial. Such effect induces an error which can be significant for Red TL. It can be corrected for, at least roughly, from experimental exploration of the dose-dependence of the residual TL.

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