SGER: A Calibration of the Production Ratio 21Ne/26Ae by Cosmic Rays at the Surface of the Earth

SGER：地球表面宇宙射线产生 21Ne/26Ae 比率的校准

• 批准号: 9116689
• 负责人: Kurt Marti
• 金额: $ 2.6万
• 依托单位: University of California-San Diego
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-09-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9116689&HistoricalAwards=false
• 关键词: SGER; Calibration; Production; Ratio; 21Ne

This research presents a novel approach to determine the relevant production ratio P21/P26 of the cosmic-ray-produced nuclides 21Ne and 26Al by isotopic measurements of Ne in quartz samples of glacially polished rocks of the Sierra Nevada range. The recently discovered cosmic-ray-produced radionuclides (10Be, 14C, 26Al, 36Cl) coupled with stable isotopes 3He, 21Ne, 22Ne and production ratios in terrestrial surface materials open up a new field of study which was not previously possible, e.g. determinations of erosion rates and geological processes (uplifts, variations in ice cover). Our feasibility study (Graf et al, 1991) has shown that cosmic-ray-produced Ne signatures in quartz can be recovered, and that determinations of the relative productions of 21Ne and 26Al (in both cases the target element is Si) will be required for the evaluation of complex exposure histories as are typical in geological processes, such as variations in the Antarctic ice cover.

这项研究提出了一种新的方法，通过对内华达山脉冰川抛光岩石的石英样品中Ne的同位素测量，确定宇宙线产生的核素21Ne和26Al的相应产额比P21/P26。最近发现的宇宙射线产生的放射性核素(10Be、14C、26Al、36Cl)与稳定的同位素3He、21Ne、22Ne以及陆地表面物质的产生率相结合，开辟了一个新的研究领域，这是以前不可能实现的，例如确定侵蚀速率和地质过程(隆起、冰盖变化)。我们的可行性研究(Graf等人，1991年)表明，可以恢复由宇宙射线在石英中产生的Ne信号，并且需要确定21Ne和26Al的相对产量(在这两种情况下，目标元素都是硅)，以评估复杂的暴露历史，这在地质过程中是典型的，例如南极冰盖的变化。