Application of pulsed OSL to the separation of the luminescence components from a mixed quartz/feldspar sample

Denby, Phil M.; Bøtter‐Jensen, L.; Murray, Andrew; Thomsen, Kristina Jørkov; Moska, Piotr

doi:10.1016/j.radmeas.2006.05.017

Cited by 89 publications

(40 citation statements)

References 15 publications

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“…From the decay-behaviour analysis, the mean decay lifetime of this quartz sample was evaluated to be 40.5±1.9 µs. This lifetime value agrees with about 35 µs, which was evaluated by Chithambo and Galloway (2000) for other quartz samples by a similar P-OSL method and 40 µs as found by Denby et al (2006). Accordingly, this decay signal could be attributed to the afterglow of the quartz sample.…”

Section: Preliminary Pulsed Osl Measurementsupporting

confidence: 88%

Construction of a Portable Mini Luminescence-Measurement System Equipped with a Miniature X-Ray Generator

2008

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For the purpose of both luminescence dosimetry and dating, a new portable mini automated luminescence-measuring system has been developed. The main parts of the new system consist of the stimulation unit, an irradiation unit and the photon detector. The size of the main measuring box is approximately 300×300×300 mm. In particular, to keep the electric power as low as possible, a miniature X-ray (Oxford, Eclipse II reflection target) generator and a metal-packaged photomultiplier tube (PMT) (Hamamatsu photonics, H7421-40) were adopted here. 16 blue LEDs were employed for the stimulation of quartz OSL. The same LED holder can be used for pulsed-OSL (P-OSL) measurements. The weight of the main part of this system was about 15 kg. In order to check the usefulness of the new system, red thermoluminescence (RTL) glow curves were measured to estimate the signal-to-noise ratio (S/N ratio) using a volcanic quartz sample. These results show that the new system improves the S/N ratio in comparison with an existing handmade system. The estimated RTL equivalent (or paleo) dose using quartz extracted from an archaeological roof tile of Shin-Yakushiji temple by means of the SAR protocol was in good agreement with previous measurements. This proves that the new system is suitable for practical use for RTL-measurements either for dosimetry or for dating with a high S/N ratio.

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Section: Preliminary Pulsed Osl Measurementsupporting

confidence: 88%

Construction of a Portable Mini Luminescence-Measurement System Equipped with a Miniature X-Ray Generator

2008

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“…The SAR protocol was applied for D e determination to 12 aliquots of each sample (limited by the available sample material). Additionally, pulsed measurements using the Risø attachment to the DA-20 reader, the LEDs were pulsed with 40 µs on-time and 150 µs off-time (Denby et al, 2006) and the OSL signal was only recorded during the off-time.…”

Section: Methodsmentioning

confidence: 99%

“…at 220°C (Jain et al, 2003); however, prolonged IR bleaching at 220°C also depletes the quartz OSL. Another possible instrumental method for isolating a quartz signal from a mixed quartz-feldspar sample is pulsed optical stimulation (Denby et al, 2006). Using pulsing, it is possible to observe a quartz dominated signal from a polymineral sample by measuring the OSL after most of the feldspar signal has decayed.…”

Section: Introductionmentioning

confidence: 99%

OSL and TL characteristics of fine grain quartz from Mongolian prehistoric pottery used for dating

et al. 2013

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Abstract:The OSL, post-IR OSL and pulsed post-IR OSL applied to polymineral grains and calculated by fitting to the data the contributions from fast, medium and slow components revealed that the polymineral samples under study are dominated by the medium component. An increase in D e 's with increasing integration intervals was observed, which is considered as an indication of increasing medium and decayed fast component; and the equivalent doses obtained using different components or minerals reflect also the shape of the dose distributions. The identified fast component in polymineral sample has photoionization cross section of 1.2±0.02 × 10 -17 cm 2 . The present study shows the usefulness of the application of different luminescence techniques combined with fitting procedures as a check which should be adopted in dating protocols. Based on luminescence ages obtained on polymineral grains from prehistoric pottery samples from the Boroo settlement, Mongolia, which are in agreement with independent age control by 14 C on charcoal material, it is argued that the manufacturing of Xiongnu -pottery at this site lasted until ca. 130±75 AD.

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“…Pulsed OSL (POSL; Thomsen et al, 2008) was also used; the LEDs were pulsed with 50 µs on-time and 100 µs off-time and the OSL signal was only recorded during the off-time. It has been reported that the luminescence lifetime for feldspar is shorter than for quartz, and thus if the signal is only recorded during the off-time of the LED stimulation, the OSL signal of feldspar contaminated samples should be dominated by quartz OSL signal (Denby et al, 2006;Thomsen et al, 2008).…”

Section: Measurements Of the Post-ir Blue-stimulated Luminescencementioning

confidence: 99%

Geoarchaeological studies on Roman time harbour sediments in Cologne — comparison of different OSL dating techniques

Lauer

Bonn²,

Frechen

et al. 2011

Geochronometria

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Due to the construction of a new North-South subway in Cologne, Roman time harbour sediments were exposed and were sampled for luminescence dating. A very good independent age control was given by the precise knowledge of the chronology of Roman activity and by radiocarbon ages of charcoal samples. Hence, different methodological approaches within luminescence dating were applied for Holocene heterogeneously bleached fluvial samples and were compared to the known ages. For one sample, optically stimulated luminescence (OSL) dating was applied to coarsegrained quartz using a single aliquot regenerative-dose (SAR) protocol. After D e -measurements, different statistical approaches were tested (i.e. arithmetic mean, median, minimum age model, finite mixture model, leading edge method and the Fuchs and Lang approach). It is demonstrated that the Fuchs and Lang approach along with the leading edge method yielded the best matching OSL ages with respect to the known ages. For the other sample which showed feldspar contamination within the quartz signal, the post-IR blue stimulated luminescence (double SAR protocol) was measured in three different ways to calculate the D e -value: with continuous wave (CW) stimulation with an IR-bleach at 50°C and at 225°C for 100 s prior to the OSL, and pulsed OSL (POSL). It was demonstrated that the IR-stimulation at 225°C has very good potential to remove the feldspar signal contribution as well as pulsed OSL, but the former might deplete parts of the quartz OSL signal.

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Application of pulsed OSL to the separation of the luminescence components from a mixed quartz/feldspar sample

Cited by 89 publications

References 15 publications

Construction of a Portable Mini Luminescence-Measurement System Equipped with a Miniature X-Ray Generator

Construction of a Portable Mini Luminescence-Measurement System Equipped with a Miniature X-Ray Generator

OSL and TL characteristics of fine grain quartz from Mongolian prehistoric pottery used for dating

Geoarchaeological studies on Roman time harbour sediments in Cologne — comparison of different OSL dating techniques

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