自然界中子俘获反应导致行星材料中发现的 Sm、Gd、Er 和 Yb 同位素变化

IF 2.5 4区 化学 Q3 CHEMISTRY, ANALYTICAL
Hiroshi Hidaka
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引用次数: 0

摘要

在陨石和月球表面物质中经常观测到 149Sm-150Sm 和 157Gd-158Gd 的同位素位移,因为它们是由宇宙射线辐照产生的二次中子相关的中子捕获反应引起的。Sm 和 Gd 的同位素位移主要用于估算热中子通量,而 167Er-168Er 的同位素位移最近被用于估算表层中子通量。Sm、Gd和Er的系统同位素数据集有助于我们利用热中子和表层中子之间通量的平衡来考虑行星材料宇宙射线照射条件的细节。本文回顾了一系列与中子俘获反应有关的 Sm、Gd 和 Er 的同位素变化,以应用于行星科学。作为更好地理解中子通量及其能量分布的一种新尝试和可能性,本文利用两种不同的数据源,即月球碎屑和 Oklo 天然反应堆,讨论了 Yb 同位素变化的使用。最后,从化学分离和仪器改进的角度介绍了对镱进行精确同位素测量的初步结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Isotopic variations of Sm, Gd, Er and Yb found in planetary materials caused by neutron-capture reactions in nature
The isotopic shifts of 149Sm–150Sm and 157Gd–158Gd have often been observed in meteorites and lunar surface materials, because they result from the neutron-capture reactions associated with secondary neutrons produced by cosmic-ray irradiation. While the Sm and Gd isotopic shifts can mainly be used for the estimation of thermal neutron fluences that of 167Er–168Er has recently been applied in the estimation of epithermal neutron fluences. The systematic isotopic dataset of Sm, Gd and Er helps us to consider the details of planetary materials’ cosmic-ray exposure conditions using the balance of the fluences between thermal and epithermal neutrons. This paper reviews a series of isotopic variations of Sm, Gd, and Er in association with neutron-capture reactions for the application of planetary sciences. As a new attempt and possibility for better understanding the neutron fluence and its energy distribution, the use of Yb isotopic variation is then discussed using two different data sources, namely lunar regolith and the Oklo natural reactors. Finally, the preliminary result for the precise isotopic measurement of Yb is presented from the viewpoint of chemical separation and instrumental improvement.
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来源期刊
Journal of Analytical Science and Technology
Journal of Analytical Science and Technology Environmental Science-General Environmental Science
CiteScore
4.00
自引率
4.20%
发文量
39
审稿时长
13 weeks
期刊介绍: The Journal of Analytical Science and Technology (JAST) is a fully open access peer-reviewed scientific journal published under the brand SpringerOpen. JAST was launched by Korea Basic Science Institute in 2010. JAST publishes original research and review articles on all aspects of analytical principles, techniques, methods, procedures, and equipment. JAST’s vision is to be an internationally influential and widely read analytical science journal. Our mission is to inform and stimulate researchers to make significant professional achievements in science. We aim to provide scientists, researchers, and students worldwide with unlimited access to the latest advances of the analytical sciences.
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