Upgrading of the Neutron Activation Analysis Facility: A Laboratory in the Massachusetts Institute of Technology Center for Geochemical Analysis

9910529免费这笔赠款支持麻省理工学院地球、大气和行星科学系中子激活分析(NAA)设备的升级。升级的主要方面是获得最先进的光谱平台，该平台将数据采集和还原集成到单个计算机系统中。此外，还将购买一个锗半导体，并改进样品制备设施。该设施由F.A.弗雷教授和P.Ila博士监督。它主要用于测定火山岩和地幔岩石中的微量元素丰度。具体地说，麻省理工学院核反应堆中子辐照后的伽马射线能谱被用来确定0.1至0.5克粉状岩石中10至25个元素的丰度。麻省理工学院的本科生和研究生以及麻省理工学院和世界卫生组织联合项目的研究人员以及来自美国东北部其他大学(如马萨诸塞大学阿默斯特分校)的研究人员都可以使用该设施。正在进行的两个主要项目是：(1)夏威夷科学钻探项目回收的熔岩研究，其目标是对夏威夷火山的整个生长和演化进行采样；(2)与东印度洋Kerguelen羽流的1.15亿年火山历史有关的熔岩研究。该项目包括对大洋钻探计划第183阶段从科尔盖伦高原回收的火成岩和科尔盖伦群岛玄武岩的地球化学研究，这些玄武岩是由美国、法国和比利时的科学家共同努力获得的。***

9910529FreyThis grant supports upgrade of the Neutron Activation Analysis (NAA) Facility in the Earth, Atmospheric, and Planetary Sciences, Department at the Massachusetts Institute of Technology. The major aspect of the upgrade is to acquire a state of the art spectroscopy platform which integrates data acquisition and reduction into a single computer system. In addition, a Ge semi-conductor will be acquired as well as improvements to the sample preparation facilities. The facility is supervised by Professor F.A. Frey and Dr. P. Ila. It is principally used to determine abundances of trace elements in volcanic and mantle rocks. Specifically gamma ray spectroscopy following neutron irradiation in the MIT Nuclear Reactor is used to determine abundances of 10 to 25 elements in 0.1 to 0.5 grams of powdered rock. This facility is used by MIT undergraduates and graduate students in the MIT and joint MIT-WHOI programs as well as researchers from other universities in the northeast U.S. (e.g., University of Massachusetts at Amherst). Two ongoing major projects are: (1) Studies of lavas recovered by the Hawaii Scientific Drilling Project whose goal is to sample the entire growth and evolution of a Hawaiian volcano; and (2) studies of lavas related to the 115 Million year volcanic history of the Kerguelen plume in the eastern Indian Ocean. This project includes geochemical research on igneous rocks recovered from the Kerguelen Plateau by Ocean Drilling Program Leg 183 and basalts from the Kerguelen Archipelago obtained in a collaborative effort involving scientists from the USA, France and Belgium. ***