2016
DOI: 10.1590/2317-488920160030295
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Abstract: The development of optically stimulated luminescence (OSL) dating of sediments has led to considerable advance in the geochronology of the Quaternary. OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. In this paper, we show examples of OSL d… Show more

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Cited by 18 publications
(13 citation statements)
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“…Briefly, the OSL method is based on the single aliquot dose concept and it functions by treating quartz grains as dosimeters, which record low amounts of ionizing ambient radiation (Aitken, 1985;Murray & Wintle, 2003). Sediment samples from NM1 were collected in a dark room to avoid exposure to sunlight, then wet sieved to 63-125 lm, treated with HCl, H 2 O 2 , and HF, and subjected to heavy liquid separation in order to isolate quartz grains (Sawakuchi et al, 2016). Sample aliquots were bleached for 3-5 h, preheated to 200°C, and delivered a 25 Gy dose using a Risø TL/OSL DA-20 with Sr/Y beta radiation source, in order to determine the OSL age (using the central age model of Galbraith et al, 1999).…”
Section: Sediment Core Analysis and Geochronologymentioning
confidence: 99%
“…Briefly, the OSL method is based on the single aliquot dose concept and it functions by treating quartz grains as dosimeters, which record low amounts of ionizing ambient radiation (Aitken, 1985;Murray & Wintle, 2003). Sediment samples from NM1 were collected in a dark room to avoid exposure to sunlight, then wet sieved to 63-125 lm, treated with HCl, H 2 O 2 , and HF, and subjected to heavy liquid separation in order to isolate quartz grains (Sawakuchi et al, 2016). Sample aliquots were bleached for 3-5 h, preheated to 200°C, and delivered a 25 Gy dose using a Risø TL/OSL DA-20 with Sr/Y beta radiation source, in order to determine the OSL age (using the central age model of Galbraith et al, 1999).…”
Section: Sediment Core Analysis and Geochronologymentioning
confidence: 99%
“…However, previous dating studies demonstrate that a wide range of equivalent doses can be reliably estimated in quartz from southeastern Brazilian sediments using a preheat temperature of 200 o C (e.g. Sawakuchi et al, 2016). Dose recovery tests for the pIRIR 290ºC signal were performed with aliquots of sample COL17-2_15.72 mcd bleached under a solar simulator (24 or 72 hours) and for aliquots bleached on the Risø TL/OSL DA-20 reader.…”
Section: Luminescence Datingmentioning
confidence: 99%
“…A técnica de datação por LOE determina o período de tempo decorrido entre a última exposição direta de grãos minerais (usualmente quartzo e feldspato) à luz solar e o instante da análise em laboratório (Guedes et al 2011, Sawakuchi et al 2016. Ou seja, essa técnica de geocronologia absoluta fornece a idade de deposição do sedimento.…”
Section: Datação Por Loeunclassified