Recent development in luminescence dating; on the extending the age range and the behavior of different OSL components from quartz

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  • ルミネッセンス年代測定法の最近の進歩－適用年代の拡大と石英のOSL成分について－
  • ルミネッセンス ネンダイ ソクテイホウ ノ サイキン ノ シンポ テキヨウ ネンダイ ノ カクダイ ト セキエイ ノ OSL セイブン ニ ツイテ

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The dose estimation method of optically stimulated luminescence (OSL) dating has improved greatly over the last few years, and has been increasingly used in dating various Quaternary sediments. However, the age range of OSL dating using quartz, determined both by the saturation dose and the dose rate, makes its applicability limited only up to about 100 ka. This paper reviews the various ongoing researches, which aims to extend the age range of luminescence dating, using quartz isothermal thermoluminescence (ITL), quartz red TL, feldspar blue OSL with fading correction, and feldspar red OSL. In addition, the luminescence properties of quartz have been found to depend on its host rock type and environment after denudation. Fast and medium OSL components of quartz, which are most suitable for dating, are not always available from sediments, which have been recently denudated and transported short distance. OSL of volcanic quartz gives age underestimation, because of the anomalous fading. Possible solutions for dealing with these problematic samples are suggested. <br>

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