A new mathematical approximation of sunlight attenuation in rocks for surface luminescence dating

Laskaris, Nikolaos; Liritzis, Ioannis

doi:10.1016/j.jlumin.2011.04.052

Cited by 43 publications

(20 citation statements)

References 16 publications

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“…If some part of this material is then exposed to daylight by erosion or fracture, the trapped charge population will begin to decrease at the exposed surface. In a sample which has been exposed to light for a prolonged period (decades to millennia) the remaining trapped charge will be zero (fully reset or bleached) at the surface and then increase towards saturation with depth (Polikreti et al, 2002(Polikreti et al, , 2003Laskaris and Liritzis, 2011;Sohbati et al, 2011Sohbati et al, , 2012a. The depth scale of this trapped charge profile depends on the opacity of the material and the daylight spectrum.…”

Section: Osl Surface Exposure Dating Modelmentioning

confidence: 99%

Surface exposure dating of non-terrestrial bodies using optically stimulated luminescence: A new method

Sohbati

Jain

Murray

2012

Icarus

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Section: Osl Surface Exposure Dating Modelmentioning

confidence: 99%

Surface exposure dating of non-terrestrial bodies using optically stimulated luminescence: A new method

Sohbati

Jain

Murray

2012

Icarus

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“…However, recent work has shown that luminescence signals can also be used to determine the duration of daylight exposure for rock surfaces (Laskaris and Liritzis, 2011;Sohbati et al, 2011Sohbati et al, , 2012a. This approach provides similar but complementary information to surface exposure dating using cosmogenic nuclides (CN); the signal in CN surface exposure dating develops over a few hundreds of centimetres of material and is applicable over relatively long time scales (∼10 4 -10 6 a), whereas the OSL surface exposure dating signal develops in a few centimetres of material and is detectable on rather short time…”

Section: Introductionmentioning

confidence: 99%

“…Sohbati et al (2011Sohbati et al ( , 2012aSohbati et al ( , 2012b proposed that the dependence of the OSL signal on depth and exposure-time could be described by a double exponential function: ) is the attenuation coefficient characterising light penetration into the rock. This model is based on first-order kinetics for luminescence decay and an exponential attenuation of light intensity with depth, and it predicts that the longer the exposure duration, the deeper the resetting of the luminescence signal into the rock surface (Habermann et al, 2000;Polikreti et al, 2002Polikreti et al, , 2003Laskaris and Liritzis, 2011;Sohbati et al, 2011Sohbati et al, , 2012a2012b). Thus, there exists chronological information in the luminescence-depth profile, but the estimation of exposure time requires an independent knowledge of the σφ 0 parameter, which is challenging to quantify from the first principles (Sohbati et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

OSL surface exposure dating of a lithic quarry in Tibet: Laboratory validation and application

Gliganic

Meyer

Sohbati

et al. 2019

Quaternary Geochronology

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A B S T R A C TRecent work has shown that the optically stimulated luminescence (OSL) signal can be used to determine the duration of daylight exposure for rock surfaces, complementing the surface exposure dating technique using cosmogenic nuclides. In this study we investigate the feasibility of using the newly developed OSL Surface exposure dating technique (OSL-Surf) to date flake scars at lithic quarry sites. We performed the first quantitative validation of the model describing the OSL-Surf dating technique using a controlled laboratory experiment. Our results show that longer laboratory bleaching durations yield deeper OSL-depth profiles, validating the use of OSL-Surf approach for relative dating of rock surfaces with different exposure ages. The OSL-surf model fitted to the OSL-depth profiles (excluding one outlier) yields accurate estimates of known exposure duration, thus confirming the method's usefulness as an absolute dating tool. Consequently, we used the OSLSurf technique to determine an exposure duration of 117 ± 37 a for a previously unknown-age flake scar that is related to human exploitation of a lithic quarry site in Tibet. The problem of finding a known-age rock surface for parameter calibration was solved by revisiting the sampling site and collecting the scar remaining after earlier sample collection, which has a precisely known exposure age (1.667 a in this study) and identical lithology and irradiation aspect as the flake scar. The calibration sample yielded a measurable OSL-depth profile that could be used to calibrate the model to estimate the exposure duration of a flake scar associated with human exploitation of the area. Finally, we observe that the μ parameter of the OSL-Surf model varies considerably between the laboratory-bleached and two naturally daylight-bleached datasets, despite having identical lithologies. We thus infer that, in addition to lithological controls, the μ parameter is primarily sensitive to the daylight irradiation geometry and only weakly dependent on spectrum of the incident light; this interpretation implies a narrow effective bleaching wavelength band in quartzite. From the practical viewpoint, our results suggest that geometrical factors deserve a careful consideration both while designing the laboratory bleaching experiments as a surrogate of natural bleaching, as well as while choosing the field calibration samples.

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“…Our experiment demonstrated that this type of in situ analysis can induce luminescence in the rock surface itself, especially on the “fresh” unexposed grains as discussed earlier. The use of direct luminescence dating on rock shelter substrates is a technique still in its infancy (Vafiadou, Murray, & Liritzis, ; Laskaris & Liritzis, ) with very few applications to archaeology (e.g., Liritzis, ) and rock art dating (e.g., Chapot et al., ) and where results are available these serve as a caution for future applications (Sohbati et al., ). However, it is again conceivable that samples for luminescence dating taken in conjunction with, or immediately following in situ XRF could incorporate samples with artificially elevated doses.…”

Section: Discussionmentioning

confidence: 99%

Non‐Destructive or Noninvasive? The Potential Effect of X‐Ray Fluorescence Spectrometers on Luminescence Age Estimates of Archaeological Samples

et al. 2016

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The non-destructive nature of X-ray fluorescence (XRF) spectrometers is a principal reason for an increase in their use in archaeological science over the last 15 years, especially for analyzing museum-curated artifacts and in situ site fabrics. Here, we show that low-power XRF spectrometry can be detrimental for luminescence dating (surface applications such as mud-wasp nest dating in particular). We investigated the effects of irradiation by X-rays emitted from handheld and benchtop spectrometers on optically stimulated luminescence (OSL) signals. Measurements were taken using a portable OSL (pOSL) unit on the following unprepared archaeological materials: sedimentary quartz grains, pottery, a mud-wasp nest, stone tools, and a rock flake with anthropogenically applied pigment and natural pigmentation (iron oxides). We observed an increase in luminescence compared to initial background counts for all materials tested, which could lead to overestimation of age determinations in some situations. Our experiment provides a reminder of the potential effects of Xray radiation, and the need for thorough documentation of all recording and analytical techniques applied to archaeological materials. C 2016 Wiley Periodicals, Inc.

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A new mathematical approximation of sunlight attenuation in rocks for surface luminescence dating

Cited by 43 publications

References 16 publications

Surface exposure dating of non-terrestrial bodies using optically stimulated luminescence: A new method

Surface exposure dating of non-terrestrial bodies using optically stimulated luminescence: A new method

OSL surface exposure dating of a lithic quarry in Tibet: Laboratory validation and application

Non‐Destructive or Noninvasive? The Potential Effect of X‐Ray Fluorescence Spectrometers on Luminescence Age Estimates of Archaeological Samples

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