Facility Support: The Purdue Rare Isotope Measurement Laboratory

设施支持：普渡大学稀有同位素测量实验室

• 批准号: 0452936
• 负责人: Marc Caffee
• 金额: $ 272.41万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2010-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0452936&HistoricalAwards=false
• 关键词: Facility; Support; Purdue; Rare; Isotope

EAR-0452936CaffeeAlthough the application of cosmic-ray-produced (cosmogenic) nuclides in earth surface processes is relatively new, the impact of these studies is astonishing. Ten years ago it was difficult to measure the erosion rate of a landscape over a timescale relevant to geomorphology; few measurements existed, and these were often unreliable. Today, basin-wide erosion rates can be measured with cosmogenic 10Be and 26Al, almost routinely, by measuring their concentrations in stream sediment. The initial success of these studies portends an immense growth in the application of cosmogenic nuclides. The measurement of cosmogenic radionuclides is accomplished using accelerator mass spectrometry (AMS). AMS is an increasingly important tool that is applied to a variety of research problems spanning numerous earth science disciplines. The unique strength of AMS is its ability to measure isotopes of an element in which the abundance ratios range from 10-12 to 10-15. The nuclides most commonly measured by AMS include 10Be, 14C, 26Al, 36Cl, and 129I. These and other radionuclides are produced in a variety of geologic settings; their concentrations can serve as chronometers or tracers of naturally-occurring processes. As demand in the NSF scientific community for AMS measurements increases PRIME Lab must be able to meet this demand and assume leadership in both measurement capabilities and scientific applications. PRIME Lab's ultimate goal is to be the focus point for the measurement and application of AMS radionuclides in Earth sciences in the U.S. During the last several years numerous upgrades have been completed. These enhancements are enabling higher precision and faster measurements. During the next four years we anticipate both improvements in existing measurement capabilities and the development of new capabilities. These developments in AMS technology will proceed in parallel with new application of cosmogenic nuclides in the Earth sciences.

EAR-0452936Caffee 尽管宇宙射线产生的（宇宙成因）核素在地球表面过程中的应用相对较新，但这些研究的影响是惊人的。十年前，很难在与地貌相关的时间尺度上测量景观的侵蚀率。几乎没有测量数据，而且这些测量数据往往不可靠。 如今，几乎可以常规地通过测量河流沉积物中的宇宙成因 10Be 和 26Al 浓度来测量全流域的侵蚀率。这些研究的初步成功预示着宇宙成因核素应用的巨大增长。宇宙源放射性核素的测量是使用加速器质谱（AMS）完成的。 AMS 是一种日益重要的工具，适用于解决众多地球科学学科的各种研究问题。 AMS 的独特优势在于它能够测量丰度比范围为 10-12 到 10-15 的元素同位素。 AMS 最常测量的核素包括 10Be、14C、26Al、36Cl 和 129I。 这些和其他放射性核素是在各种地质环境中产生的；它们的浓度可以作为自然发生过程的计时器或示踪剂。随着 NSF 科学界对 AMS 测量的需求不断增加，PRIME 实验室必须能够满足这一需求，并在测量能力和科学应用方面占据领导地位。 PRIME 实验室的最终目标是成为美国地球科学中 AMS 放射性核素测量和应用的焦点。在过去几年中，已经完成了许多升级。这些增强功能可实现更高的精度和更快的测量速度。在接下来的四年中，我们预计现有测量能力将得到改进，新能力将得到开发。 AMS 技术的这些发展将与宇宙成因核素在地球科学中的新应用同时进行。