用于X射线荧光元素定量分析的PIXL飞行前校准
Pre-Flight Calibration of PIXL for X-ray Fluorescence Elemental Quantification
AI总结：
本研究针对NASA火星2020毅力号搭载的PIXL仪器开展飞行前元素校准，通过模拟火星环境测量参考物质，推导不确定性矩阵并集成到配套软件，明确了精度影响因素、校准方法与后续改进方向，保障火星原位成分分析的准确性。
摘要：
行星X射线岩石化学仪器（Planetary Instrument for X-ray Lithochemistry，PIXL）是安装在美国国家航空航天局（National Aeronautics and Space Administration，NASA）火星2020毅力号火星车机械臂上的一种可扫描聚焦束X射线荧光（XRF）光谱仪。为确保PIXL能够在飞行中对火星目标物进行原位的精准成分分析，研究人员在模拟火星环境中对PIXL飞行仪器开展了飞行前元素校准工作。本次校准的细节以及其对火星未知物质测量的启示是本文的研究主题。本次校准的主要目标有两个：一是调试光谱仪以开展精准的元素分析，二是推导一套不确定性矩阵，用于未知物质中所有元素的XRF测量。研究人员使用飞行硬件在模拟火星环境中测量了少量纯元素、纯化合物靶标以及地质相关参考物质。元素校准与定量分析通过PIXL的XRF定量软件（PIQUANT）完成。生成的不确定性数据已被集成到PIXL数据可视化软件（PIXLISE）所使用的PIQUANT软件版本中。本工作概述了影响微束XRF精度的一系列因素、校准涉及的方法与步骤、不确定性矩阵构建的细节、未知物质测量中不确定性的使用与解读说明，以及对后续校准工作中存在的局限性与未来改进方向的评估。
英文摘要：
The Planetary Instrument for X-ray Lithochemistry (PIXL) is a rasterable focused-beam X-ray fluorescence (XRF) spectrometer mounted on the arm of National Aeronautics and Space Administration's (NASA) Mars 2020 Perseverance rover. To ensure that PIXL would be capable of performing accurate in-flight compositional analysis of martian targets, in situ, an elemental calibration was performed pre-flight on the PIXL flight instrument in a simulated martian environment. The details of this calibration, and implications for measuring unknown materials on Mars are the subjects of this paper. The major goals of this calibration were both to align the spectrometer to perform accurate elemental analysis and, to derive a matrix of uncertainties that are applied to XRF measurements of all elements in unknown materials. A small set of pure element and pure compound targets and geologically relevant reference materials were measured with the flight hardware in a simulated martian environment. Elemental calibration and quantifications were carried out using PIXL's XRF quantification software (PIQUANT). Uncertainties generated were implemented into the PIQUANT software version employed by the PIXL's data visualization software (PIXLISE). We outline in this work, a list of factors that impact micro-XRF accuracy, the methodology and steps involved in the calibration, details on the fabrication of the uncertainty matrix, instructions on the use and interpretations of the uncertainties applied to unknowns and an assessment on the limitations and areas open to future improvement as part of subsequent calibration efforts.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
