NSF Arizona Accelerator Mass Spectrometry Facility: Operations and Research Applications

NSF 亚利桑那州加速器质谱设施：运营和研究应用

• 批准号: 9508413
• 负责人: Douglas Donahue
• 金额: $ 98.81万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-01 至 1998-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9508413&HistoricalAwards=false
• 关键词: NSF; Arizona; Accelerator; Mass; Spectrometry

9508413 Donahue An Accelerator Mass Spectrometer (AMS) using a 2 MV General Ionex tandem particle accelerator has been operated at the University of Arizona since 1981. The primary mission of this AMS laboratory is twofold. It operates as both a service laboratory to provide radiocarbon (l4C) determinations of samples of geophysical and archaeological importance to the scientific community at large, but also supports a wide range of in-house scientific research. The laboratory presently analyzes the l4C content of over 3,000 samples a year for many scientists from many parts of the world. Just under half of the current laboratory analyses are for in-house research, or for research undertaken in collaboration with external researchers. Such in-house research has focused on a diverse set of topics. Some of this research has been oriented toward improving AMS technology in terms of chemical preparation of samples, improvements to instrumentation and data reduction and interpretation. The labs efforts have enabled them to obtain unprecedented precision in l4C analyses. They currently are able to produce l4C/l3C ratios with measurement precisions of +0.5% in a counting time of about 30 minutes per sample, for recent material. High-precision measurements as accurate as +0.25% have been reported by this facility using multiple target determinations. Other in-house research projects are oriented towards more basic science goals including studies of in-situ production of 14C in rocks and ice and improvements to the l4C calibration curve using tree rings or coral l4CU-Th measurements. This grant supports operating and maintenance costs of the Arizona Accelerator Mass Spectrometer (AMS) laboratory and will allow them to maintain and improve the high standards of AMS measurements that the scientific community has come to expect from this facility, and to develop new applications of AMS, which will then be available to the scientific community. As part of this grant, Arizona will upgrade their existing AMS system with an injection system with an electrostatic analyzer, a high-resolution injection magnet, a fast isotope pulsing system, a high-energy analysis system with an electrostatic quadrupole lens, a 90 magnetic analyzer, and a cylindrical electrostatic analyzer. Support for the next International Conference on Accelerator Mass Spectrometry, to be held in Tucson in March 1996 is also included. ***

9508413 Donahue 自 1981 年以来，亚利桑那大学一直在使用使用 2 MV General Ionex 串联粒子加速器的加速器质谱仪 (AMS)。该 AMS 实验室的主要任务是双重的。 它既是一个服务实验室，为整个科学界提供具有地球物理和考古重要性的样品的放射性碳 (14C) 测定，同时也支持广泛的内部科学研究。 目前，该实验室每年为来自世界各地的许多科学家分析 3,000 多个样品的 l4C 含量。 目前的实验室分析中有不到一半是用于内部研究或与外部研究人员合作进行的研究。 此类内部研究集中于一系列不同的主题。其中一些研究旨在改进 AMS 技术，包括样品的化学制备、仪器的改进以及数据简化和解释。 实验室的努力使他们能够在 l4C 分析中获得前所未有的精度。 对于最近的材料，他们目前能够在每个样品约 30 分钟的计数时间内产生测量精度为 +0.5% 的 l4C/l3C 比率。该设施使用多个目标测定报告了精确度高达 +0.25% 的高精度测量结果。 其他内部研究项目面向更基础的科学目标，包括研究岩石和冰中 14C 的原位生产以及使用树木年轮或珊瑚 l4CU-Th 测量改进 l4C 校准曲线。 这笔赠款支持亚利桑那州加速器质谱仪 (AMS) 实验室的运营和维护成本，并使他们能够维持和提高科学界对该设施所期望的 AMS 测量的高标准，并开发 AMS 的新应用，然后将其提供给科学界。 作为这笔拨款的一部分，亚利桑那州将升级其现有的 AMS 系统，配备带静电分析仪的注入系统、高分辨率注入磁体、快速同位素脉冲系统、带静电四极透镜的高能分析系统、90 磁力分析仪和圆柱形静电分析仪。 还包括对 1996 年 3 月在图森举行的下一届国际加速器质谱会议的支持。 ***