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

本研究提出了一种新的方法来确定宇宙射线产生的核素21Ne和26Al的相关生产比P21/P26的同位素测量内华达山脉冰川抛光岩石石英样品中的Ne。最近发现的宇宙射线产生的放射性核素（10Be, 14C, 26Al, 36Cl）与稳定同位素3He， 21Ne， 22Ne和陆地表面物质的生产比率相结合，开辟了一个新的研究领域，这是以前不可能的，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 et al, 1991）表明，可以恢复石英中宇宙射线产生的Ne特征，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Si），以评估复杂的暴露历史，这是典型的地质过程，例如南极冰盖的变化。

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.