NSF Arizona AMS Laboratory: Research and Operational Support

该合同将为nsf -亚利桑那加速器质谱（AMS）设施的持续运行提供资金。该设施利用两个AMS仪器，这两个仪器专门用于研究宇宙成因同位素，自1981年以来一直在亚利桑那大学运行。该实验室的主要工作集中在放射性碳（14C）的测量上，还有对10Be和129I的其他研究。美国国家科学基金会-亚利桑那州AMS设施使科学家能够将史前材料追溯到距今50年前，并使用放射性碳作为化学示踪剂来研究碳在自然界中遵循的途径。对这些途径的理解，阐明了海洋、陆地和大气中地球过程的多样性。美国国家科学基金会-亚利桑那州AMS设施的测量使研究人员能够随着时间的推移研究这些过程，并将过去作为研究现在的基准。在过去连续两年里，该设施每年进行6000多次放射性碳测量。美国国家科学基金会-亚利桑那州AMS设施的时间和资源平均分配给服务和研究。这两项活动是互补的，都有助于提案的智力价值和更广泛的影响。研究中心的研究扩展了其为更大的科学界提供服务的能力，反过来，服务工作也有利于新的研究计划。内部研究计划强调各种样品类型的样品处理技术的发展。未来几年拟议的研究活动包括考古学、气象学、放射性碳校准、森林火灾、原位14C和10Be、古气候、海洋学和水文学的研究，以及使用129I和26Al的研究。这项提议的广泛影响体现在使用该设施的科学家的数量和多样性，以及在这里接受培训的学生的数量。这些学生中的许多人接受了实际操作培训，并且大量的学生分析是免费提供的。

0446861JullThis award will provide funding for the continued operation of the NSF-Arizona Accelerator Mass Spectrometry (AMS) Facility. This facility utilizes two AMS instruments which are dedicated to the study of cosmogenic isotopes and has operated at the University of Arizona since 1981. The laboratory focuses most of its effort on radiocarbon (14C) measurements, with other studies on 10Be and 129I. The NSF-Arizona AMS Facility enables scientists to date prehistoric materials to ~50 kyr before present and to use radiocarbon as a chemical tracer to investigate the pathways carbon follows in nature. Understanding these pathways illuminates a diversity of earth processes in the oceans, on land, and in the atmosphere. NSF-Arizona AMS Facility measurements allows researchers to study these processes over time, and use the past as a benchmark for studying the present. For the last two consecutive years the facility has produced over 6,000 radiocarbon measurements annually.The time and resources of the NSF-Arizona AMS Facility are evenly divided between service and research. These two activities are complementary and both contribute to the intellectual merit and broader impacts of the proposal. Research within the Facility expands its capabilities for service to the greater scientific community, and conversely the service work can benefit new research initiatives. The in-house research program emphasizes the development of sample processing techniques for a variety of sample types. Proposed research activities for the coming years include studies in archaeology, meteoritics, radiocarbon calibration, forest fires, in situ 14C and 10Be, paleoclimate, oceanography and hydrology, as well as studies using 129I and 26Al. The broader impacts of the proposal are manifest in the number and diversity of scientists who use the facility, and by the number of students who receive training here. Many of these students received hands-on training and the bulk of student analyses were provided at no cost.