Equipment: MRI: Track #1 Acquisition of electron spin resonance spectrometer for radiation exposure dating

设备： MRI：轨道

• 批准号: 2320509
• 负责人: Kathleen Rodrigues
• 金额: $ 44.06万
• 依托单位: Nevada System of Higher Education, Desert Research Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2320509&HistoricalAwards=false
• 关键词: Equipment; MRI; Track; #1; Acquisition

This Major Research Instrumentation Program (MRI) award supports the acquisition of an electron spin resonance (ESR) spectrometer and standalone X-ray irradiator that will be used for geological and archaeological dating at the Desert Research Institute (DRI) in Reno, Nevada. ESR dating is one of a family of ‘radiation exposure’ dating methods that relies on the accumulated radiation dose stored in a material to determine its age. Other methods in the family include optically stimulated luminescence (OSL) and thermoluminescence (TL), both of which are currently supported at DRI. ESR dating offers two main advantages over OSL and TL: (1) the method can be applied to a much wider range of materials including, but not limited to, quartz, tooth enamel, and carbonates, and (2) its applicable dating range spans the last 2 million years, far surpassing the capabilities of luminescence dating methods. Importantly, acquisition of this ESR spectrometer will establish DRI as one of only two North American institutions with ESR dating capabilities and will vastly increase the number of opportunities for research collaboration and innovation. This new instrumentation will also enhance DRI’s strong track record of undergraduate and graduate student research training and provide new opportunities to attract and train geochronologists from across North America.Acquisition of a Bruker EMXmicro continuous wave X-band ESR spectrometer and benchtop X-ray irradiator (X-ray Dose ESR Version, Freiberg Instruments) will enable a number of multi-disciplinary research projects that address questions spanning a variety of depositional environments and timescales over the Quaternary period. Some of these projects include: (1) defining the timescales and drivers of Quaternary terrace formations along the Rio Grande valley, New Mexico, (2) refining radiocarbon chronologies based on lacustrine shells, (3) paleohydrological modeling of mid- to late- Pleistocene pluvial lakes in the Great Basin, (4) constraining long-term slip rates and the timing of extension in the Great Basin, and (5) reconstructing Antarctic sedimentary provenance using paired ESR and luminescence analyses.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

这项重大研究仪器计划（MRI）奖支持购买电子自旋共振（ESR）光谱仪和独立的X射线辐照器，这些光谱仪和X射线辐照器将用于内华达州里诺的沙漠研究所（DRI）的地质和考古年代测定。ESR测年法是一种“辐射暴露”测年法，它依赖于材料中储存的累积辐射剂量来确定其年龄。该家族中的其他方法包括光致发光（OSL）和热致发光（TL），这两种方法目前都在DRI得到支持。与光释光和热释光相比，ESR测年法有两个主要优点：（1）该方法可以应用于更广泛的材料，包括但不限于石英、牙釉质和碳酸盐;（2）其适用的测年范围跨越了过去200万年，远远超过了发光测年法的能力。重要的是，这台ESR光谱仪的收购将使DRI成为北美仅有的两个拥有ESR测年能力的机构之一，并将大大增加研究合作和创新的机会。这一新仪器还将增强DRI在本科生和研究生研究培训方面的良好记录，并为吸引和培训来自北美各地的地质年代学家提供新的机会。（X射线剂量ESR版本，弗赖贝格仪器）将使一些多-学科研究项目，解决跨越第四纪各种沉积环境和时间尺度的问题。其中一些项目包括：（1）确定新墨西哥州格兰德河河谷沿着第四纪阶地形成的时间尺度和驱动因素，（2）基于湖壳完善放射性碳年代学，（3）大盆地中更新世中期至晚期洪积湖的古水文学建模，（4）限制大盆地长期滑动速率和延伸时间，（5）利用成对ESR和发光分析重建南极沉积物源。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。