Support for GeoCAMS: An Accelerator Mass Spectrometry Facility for Earth Science Research

这项拨款将为地球科学同位素研究设施——劳伦斯利弗莫尔国家实验室加速器质谱中心（CAMS） FN串联范德格拉夫加速器的地球科学组成部分GeoCAMS的运行提供两年的部分支持。在十年的成功运行中，GeoCAMS已经开发并展示了测量陆地样品中3H， 7,10Be, 26Al， 36Cl和129I水平以及陨石中41Ca水平的能力。GeoCAMS已经测量了15,000个10Be目标，9400个26Al目标，9800个36Cl目标，300个41Ca目标以及较少数量的3H， 7Be和129I目标。GeoCAMS是由美国能源部和加州大学资助建造的，已经为许多国家科学基金会的项目提供了服务，其中包括去年的20多个项目，事实上，它已经成为美国国家科学基金会地球科学研究所的AMS测量设施。在此期间，GeoCAMS在教育领域发挥了关键作用。GeoCAMS培养了27名博士生和7名硕士生。过去几年里，美国大学新建的绝大多数地表暴露测年实验室都是由在GeoCAMS接受过培训的年轻教师创建的。在这项资助支持的设施能力的同时，GeoCAMS的工作人员还开展了古气候、冰芯研究、地球表面过程和大气混合等广泛的地球科学研究。该提案的目标是使GeoCAMS设备能够为NSF地球科学界提供服务，同时继续提高现有性能并增加新核素的能力，如原位14C和53Mn。GeoCAMS设备的评级在全球同类设备中处于或接近于顶级水平。＊＊＊

0217981FinkelThis grant will provides two years partial support for the operation of GeoCAMS, the Earth Science component of the FN tandem van de Graaff accelerator at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry (CAMS) as a facility for isotopic studies in the Earth Sciences. In ten years of successful operation, GeoCAMS has developed and demonstrated capabilities to measure 3H, 7,10Be, 26Al, 36Cl, and 129I at levels found in terrestrial samples and 41Ca at levels found in meteorites. GeoCAMS has measured 15,000 10Be targets, 9400 26Al targets, 9800 36Cl targets, 300 41Ca targets and a lesser number of 3H, 7Be and 129I targets. GeoCAMS, built with DOE and UC funds, has served numerous NSF PIs, including more than twenty during the past year, and has, de facto, come to serve NSF Earth Sciences as a facility for AMS measurements. During this time GeoCAMS has played a key role in education. Twenty-seven Ph.D. students and seven master's students have been trained at GeoCAMS. The large majority of the new surface exposure dating labs set up at U.S. universities during the past few years have been started by young faculty trained at GeoCAMS. In parallel to the facility capability supported by this grant, a wide range of Earth science research in paleoclimate, ice core research, Earth surface processes and atmospheric mixing is carried out by GeoCAMS staff. The goal of this proposal is to make the GeoCAMS facility, which is rated at or near the top of such facilities worldwide, available to the NSF Earth Science community while at the same time continuing to improve the existing performance and to add capabilities for new nuclides, such as in-situ 14C and 53Mn. ***