Development of Nondestructive Elemental Analysis System for Hayabusa2 Samples Using Muonic X-rays
Development of Nondestructive Elemental Analysis System for Hayabusa2 Samples Using Muonic X-rays
复制标题
利用 Muonic X 射线开发隼鸟 2 号样品无损元素分析系统
DOI：
10.1021/acsearthspacechem.2c00303
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Kazuhiko Ninomiya et al
中科院分区：
文献类型：
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作者：
Takahito Osawa;Shunsaku Nagasawa;Kazuhiko Ninomiya et al
小行星样本中碳和其他主要元素的浓度为地球上生命的诞生和太阳系演化提供了非常重要的信息。使用 μ 子 X 射线进行元素分析是确定固体材料元素组成的最佳分析方法之一，尤其是，它是以非破坏性方式确定散装样品中轻元素浓度的唯一方法。我们开发了一种新的分析系统，使用 μ 子 X 射线来测量由隼鸟 2 号航天器从小行星 Ryugu 回收的珍贵且预期微小的样品中碳和其他主要元素的浓度。在这里，我们分四个阶段介绍了该系统的开发过程及其系统配置。该分析系统由不锈钢分析室、用于在清洁环境中操作小行星样本的亚克力手套箱以及围绕分析室布置的Ge半导体探测器组成。分析系统的性能，包括对测量至关重要的背景水平，从第一阶段到后期都有了很大的提高。我们的可行性研究表明，我们的μ子X射线分析系统的最新模型能够确定Hayabusa2样品模型中的碳浓度，在6天的测量中不确定度小于10%。
The concentrations of carbon and other major elements in asteroid samples provide very important information on the birth of life on the Earth and the solar-system evolution. Elemental analysis using muonic X-rays is one of the best analytical methods to determine the elemental composition of solid materials and, notably, is the only method to determine the concentration of light elements in bulk samples in a nondestructive manner. We developed a new analysis system using muonic X-rays to measure the concentrations of carbon and other major elements in precious and expectedly tiny samples recovered from the asteroid Ryugu by spacecraft Hayabusa2. Here we report the development process of the system in 4 stages and their system configurations, The analysis system is composed of a stainless-steel analysis chamber, an acrylic glovebox for manipulating asteroid samples in a clean environment, and Ge semiconductor detectors arranged to surround the analysis chamber. The performance of the analysis system, including the background level, which is crucial for the measurement, was greatly improved from the first stage to the later ones. Our feasibility study showed that the latest model of our muonic X-ray analysis system is capable of determining the carbon concentration in Hayabusa2’s sample model with an uncertainty of less than 10% in a 6 day measurement.