Infrared-Radiofluorescence (IR-RF) Dating of loess samples with independent age control from central Alaska – further investigations to establish IR-RF as a resilient dating method

红外线放射萤光测年法是一种测定沉积物颗粒最后一次阳光照射的方法。该方法适用于钾长石，具有追溯到几十万年的潜力，红外射频信号具有高稳定性的特点。因此，测年方法是发光测年的一个重要替代方法，尤其适用于建立中更新世沉积物的年代框架。到目前为止，仍然有一些与IR RF相关的方法学问题需要解决，只有少数几个测年实验室应用IR RF。为了在测年专家和第四纪科学家中获得更高的接受度，必须进行进一步的调查，并且必须概述IR-RF产生弹性的年代学结果。本研究项目的目的是测试和进一步发展的IR RF方法，通过应用IR RF的细粒样品与独立的年龄控制主要取自北方美国黄土-古土壤序列。样品的时代从全新世到中更新世。将应用剂量恢复试验来修改IR RF单等份方案。此外，将进行关于IR RF信号的可漂白性和饱和行为的实验。最终的等效剂量测量和年龄测定的可靠性，可以观察到由于给定的独立的年龄控制的研究samples.Based上的实验结果，我们打算获得更详细的了解物理（电子路径）背后的红外射频发射。最后，其目的是提供一种测年方法，满足第四纪测年方法领域所需的高质量标准。

Infrared Radiofluorescence (IR RF) dating is a method to determine the last sunlight exposure of sediment grains. The method is applied to potassium feldspar, has the potential to date back several 100 ka and the IR RF signal is characterized by high stability. Hence, the dating method is an important alternative to luminescence dating and it is especially relevant to establish chronological frameworks for Middle Pleistocene sediments. Until now, there are still several methodological issues related to IR RF, that need to be solved and only few dating laboratories apply IR RF. To obtain a higher acceptance of the method among dating specialists and Quaternary scientists further investigations are mandatory and it has to be outlined that IR-RF yields resilient chronological results. The aim of this research project is to test and further develop the IR RF method by applying IR RF to fine-grain samples with independent age control mainly taken from northern American loess-palaeosol sequences. The age of the samples ranges from the Holocene to the Middle Pleistocene. Dose recovery tests will be applied to modify the IR RF single aliquot protocol. Furthermore, experiments concerning the bleachability and the saturation behavior of the IR RF signal will be conducted. The reliability of final equivalent dose measurements and age determinations can be observed due to the given independent age control of investigated samples.Based on the results of the experiments, we intend to obtain a more detailed understanding of physics (electron pathways) behind the IR RF emission. Finally, the aim is to provide a dating approach that fulfills the high quality criteria needed in the field of Quaternary dating methods.