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地球科学进展  2017, Vol. 32 Issue (10): 1111-1118    DOI: 10.11867/j.issn.1001-8166.2017.10.1111
研究论文     
光释光测年中石英颗粒全球标准曲线法(gSGC)与单片再生法(SAR)等效剂量(De)的比对
杨宏宇1, 2, 赵晖1, *, 王兴繁1, 2, 耿建伟1, 2
1.中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室,甘肃 兰州 730000;
2.中国科学院大学资源与环境学院,北京 100049
Optical Dating Equivalent Dose (De) Comparison of Global Standardised Growth Curve (gSGC) and Single-aliquot Regenerative-dose (SAR) Methods for Quartz Grains
Yang Hongyu1, 2, Zhao Hui1, *, Wang Xingfan1, 2, Geng Jianwei1, 2
1.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
2.College of Resources and Environment, University of Chinese Academy of Sciences, Benjing 100049, China
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摘要:

全球标准曲线法(gSGC)的提出为高效快速地测定释光样品的等效剂量(De)值提供了可能。但是由于各个实验室的放射源剂量率、操作流程、仪器误差以及选取的再归一化剂量值等不同,每个实验室得出的gSGC会有参数的不同。通过建立实验室的gSGC曲线和测试流程,并比较gSGC法和SAR法获取的De值的一致性,发现在低剂量范围内(0~100 Gy),使用gSGC法估计的De和SAR法估计的De非常接近,表明在低剂量范围内用gSGC法估计De是可靠的。这将很大程度地提高本实验室的释光测年速度,同时也为其他实验室gSGC的建立提供借鉴。在较高剂量范围(>100 Gy)与SAR方法结果比对时出现较大差别,这可能是由于研究中用于拟合gSGC的样品数量不够多,尤其是年龄较老的样品还不够多,还需在今后工作中逐步积累更多样品,完善gSGC参数,使其也能胜任较老年龄样品。

关键词: 全球标准生长曲线法(gSGC)石英颗粒等效剂量(De)单片再生剂量法(SAR)光释光测年    
Abstract:

Optical dating is a method of measuring the time since the sample was buried from last thermal event or light exposure. Samples such as quartz and feldspar grains are the most commonly used sediment of measurement. Single-Aliquot Regenerative-dose (SAR) method has become the most acceptable procedure for obtaining the equivalent Dose (De) of a sample. The Standardised Growth Curve (SGC) method provides a possible procedure for measuring a large number of samples; the limitation is that the growth curve fitted by different samples or even different aliquots is divergent. The global Standardised Growth Curve (gSGC) method improves the shortage by normalizing the dose response curves using one regenerative dose OSL signal. The gSGC provides a possible method for obtaining the De value of the sample efficiently and quickly. However, due to the radiation dose rate, operating procedures and instrument error and the selected regenerative-dose normalized dose value, etc., each laboratory should develop their own gSGC which has unique parameters. This study established the gSGC curve and measurement process of our laboratory, and then compared the consistency of the equivalent Dose (De) values from gSGC and SAR methods. In gSGC procedure, the De value of an aliquot can be estimated from the nature signal, one regenerative dose signal and their corresponding test dose signal. It will speed up the optical dating measurement rate of our laboratory and provide reference to establish gSGC in other laboratories. It is found that in the low dose range (0~100 Gy) the obtained De values were well consistent by gSGC and SAR methods. There were obviously differences in the higher dose range (>100 Gy) compared to the SAR results. It may be due to the insufficient number of older samples used to fit gSGC in this study. It is necessary to gradually accumulate more samples to improve the gSGC parameters in the future work. For some aliquots, individual quartz grains do not follow the global standardised growth curve, which leads to some deviations of De from gSGC. However, these two methods could obtain the similar average De value when multiple aliquots measuring.

Key words: Single-Aliquot Regenerative-dose (SAR)    Global Standardised Growth Curve (gSGC)    Equivalent dose (De).    OSL dating    Quartz grains
收稿日期: 2017-06-05 出版日期: 2017-10-20
ZTFLH:  P597  
基金资助:

国家自然科学基金项目“巴丹吉林沙漠西南缘山地洪水补给沙漠地下水的沉积学与年代学证据”(编号:41771016)资助.

通信作者: 赵晖(1973-),男,山西忻州人,研究员,主要从事释光年代学和环境演化研究.E-mail:hzhao@lzb.ac.cn   
作者简介: 杨宏宇(1992-),女,山西太谷人,硕士研究生,主要从事环境工程研究.E-mail:yanghongyu15@mails.ucas.ac.cn
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引用本文:

杨宏宇, 赵晖, 王兴繁, 耿建伟. 光释光测年中石英颗粒全球标准曲线法(gSGC)与单片再生法(SAR)等效剂量(De)的比对[J]. 地球科学进展, 2017, 32(10): 1111-1118.

Yang Hongyu, Zhao Hui, Wang Xingfan, Geng Jianwei. Optical Dating Equivalent Dose (De) Comparison of Global Standardised Growth Curve (gSGC) and Single-aliquot Regenerative-dose (SAR) Methods for Quartz Grains. Advances in Earth Science, 2017, 32(10): 1111-1118.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2017.10.1111        http://www.adearth.ac.cn/CN/Y2017/V32/I10/1111

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