Improving the reliability of single-aliquot regenerative聽dose dating using a new method of data analysis

详细信息	查看全文 | 推荐本文 |

• 作者：X.L. Wang^a ; ^{wxl@loess.llqg.ac.cn} ; A.G. Wintle^b ; ^c ; G. Adamiec^d
• 关键词：Coarse quartz ; OSL ; SAR ; Underestimation ; Data analysis
• 刊名：Quaternary Geochronology
• 出版年：2012
• 期刊代码：9_18711014
• 类别：ear
• 出版时间：June, 2012
• 卷：9
• 期：Complete
• 页码：65-74
• 文件大小：1022 K

摘要

The study of quartz grains (diameter 90-125聽渭m) from a modern dune sand from Australia shows a lack of perfect proportionality between the regenerated OSL (L) signal and the subsequent test dose OSL (T) signal when using a single-aliquot regenerative聽dose (SAR) procedure with a fixed 15聽Gy dose repeated five times. This lack of perfect proportionality results in both a broad D_e distribution and systematic offset for the doses measured both with and without a preheat step at the end of each cycle of the SAR procedure. The problems caused by the lack of proportionality are overcome by a new method of handling the data generated by use of the SAR protocol; the OSL intensity is sensitivity-corrected using the slope of a plot of L versus T obtained from a number of aliquots, rather than the ratio of L/T obtained for individual aliquots. This approach is validated using laboratory irradiated quartz with given doses ranging from 5聽Gy to 60聽Gy; for the larger doses, correct values can be recovered using the new data analysis procedure is applied, but not when using the ratio of L/T obtained using conventional SAR analysis.