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

9910529 frey该拨款支持麻省理工学院地球、大气和行星科学系中子活化分析（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，还将收购Ge半导体，并改进样品制备设施。该设施由F.A.弗雷教授和P.伊拉博士监督。它主要用于测定火山和地幔岩石中微量元素的丰度。具体来说，麻省理工学院核反应堆中子辐照后的伽马射线光谱学用于测定0.1至0.5克粉末状岩石中10至25种元素的丰度。该设施供麻省理工学院本科生和麻省理工学院和麻省理工学院- whoi联合项目的研究生以及来自美国东北部其他大学（例如马萨诸塞大学阿默斯特分校）的研究人员使用。两个正在进行的主要项目是：(1)研究夏威夷科学钻探项目回收的熔岩，其目标是对夏威夷火山的整个生长和演化进行采样；(2)研究与东印度洋克格伦柱1.15亿年火山史相关的熔岩。该项目包括对海洋钻探计划第183号从克格伦高原开采的火成岩进行地球化学研究，以及由美国、法国和比利时科学家共同努力从克格伦群岛获得的玄武岩。* * *

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. ***