Acquisition of a New TIMS for Ocean and Earth Sciences at the University of Florida

佛罗里达大学购买新的海洋和地球科学 TIMS

• 批准号: 9601872
• 负责人: Paul Mueller
• 金额: $ 36.07万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2002-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9601872&HistoricalAwards=false
• 关键词: Acquisition; New; TIMS; Ocean; Earth

9601872 Mueller This proposal seeks funding to support 50% of the cost of acquiring and operating a state-of-the-art thermal ionization mass spectrometer (TIMS) for the Geology Department of the University of Florida. The proposed instrument will provide enhanced performance in three areas: 1) The instrument will be capable of providing extended dynamic range (10 ) through the ability to measure sample ion beans with both Faraday and electron multiplier- or scintillation - type detectors simultaneously. This capability is essential for utilizing systems in which the abundance of individual isotopes, including tracers, exceeds the dynamic range of Faraday detectors alone. 2) The instrument will be capable of providing high abundance sensitivity at high mass. This extended capability, relative to traditional TIMS configurations, is also necessary for accurate measurements in the U-Th series and provides benefits in lower mass systems such as Ca. Recent developments in the use of retarding potential lens can provide this capability without the need (and cost) of large, double focusing configurations; 3) The instrument will be capable of high precision isotopic ratio measurements in static mode. Measurement in this mode is necessary in order to combine the advantages of increased dynamic range and extended abundance sensitivity to provide maximum accuracy for small samples, e.g., those containing only picogram (10 g) quantities of Pb, and those with low ionization efficiencies, e.g., Th. Specific applications that will benefit include the analysis of U-series isotopes for recent geochronology; the analysis of individual zircon crystals or parts of crystals for geochronologic and petrogenetic studies; Pb, Sr, and Nd isotopic studies of very small samples for tracer, chronostratigraphic, and paleo-environmental applications; and Sr/Ca isotopes via isotope dilution for paleoenvironme ntal studies. Their current mass spectrometer is heavily utilized by graduate students. Approximately half of these students are women, a minority in the geosciences. The University of Florida is supporting this project with $360,730, which represents a 50% cost share. ***

9601872 Mueller 该提案寻求资金支持佛罗里达大学地质系购买和运行最先进的热电离质谱仪 (TIMS) 的 50% 成本。 拟议的仪器将在三个方面提供增强的性能： 1) 该仪器将能够通过同时使用法拉第和电子倍增器或闪烁型检测器测量样品离子豆的能力来提供扩展的动态范围 (10 )。 这种能力对于利用单个同位素（包括示踪剂）的丰度超过法拉第探测器单独动态范围的系统至关重要。 2) 该仪器将能够在高质量下提供高丰度灵敏度。 相对于传统的 TIMS 配置，这种扩展功能对于 U-Th 系列的精确测量也是必要的，并且为 Ca 等较低质量系统提供了优势。 最近在使用延迟潜在透镜方面的发展可以提供这种能力，而无需（和成本）大型双聚焦配置； 3) 该仪器将能够在静态模式下进行高精度同位素比测量。 为了将增加的动态范围和扩展的丰度灵敏度的优点结合起来，为小样品（例如仅含有皮克（10 g）量的 Pb 的样品和电离效率较低的样品（例如, 钍。 受益的具体应用包括近期地质年代学的 U 系列同位素分析；对单个锆石晶体或晶体部分进行地质年代学和岩石成因研究的分析；用于示踪剂、年代地层学和古环境应用的极小样品的 Pb、Sr 和 Nd 同位素研究；和 Sr/Ca 同位素，通过同位素稀释进行古环境研究。 他们目前的质谱仪被研究生大量使用。 这些学生中大约一半是女性，在地球科学领域占少数。 佛罗里达大学为该项目提供 360,730 美元的支持，占成本份额的 50%。 ***