Upgrading of Northern Arizona University Electron Microprobe Laboratory

9812392hoisch这笔拨款用于支持北亚利桑那大学电子显微探针实验室的升级。该仪器是一台上世纪70年代的ETEC自动探测器，将配备现代探测器电子设备和视频光学系统。目前，该仪器配备了原装ETEC前置放大器、脉冲高度分析仪、检测器高压电源和速率计。它们都至少有20年的历史，在运行过程中变得不稳定。由于ETEC不再营业，因此无法提供较新的组件。旧的组件将被现代的现成组件所取代，电子反馈通道将被修改以接受这些新组件。这些升级将无限期地延长仪器的使用寿命，增加仪器的稳定性，并允许易于维修。现有的光学显微镜将增加由摄像机、监视器、图像捕捉板、PC机组成的视频系统。这次升级将大大提高机器的教学和培训能力，允许多人同时观察分析操作。图像捕捉系统将允许生成分析点位置的准确实时记录。该实验室服务于亚利桑那州北部和内华达州南部地区，由北亚利桑那大学人类学和地质系、拉斯维加斯内华达大学地质系、美国地质调查局弗拉格斯塔夫野外办事处和纳瓦霍民族考古部门的研究人员使用。该实验室支持火成岩和变质岩学、考古学和人类学的各种研究

9812392HoischThis grant provides support to upgrade the electron microprobe laboratory at Northern Arizona University. The instrument, an ETEC Autoprobe dating from the 1970's, will be outfitted with modern detector electronics and a video optical system. At present, the instrument is equipped with original ETEC preamplifiers, pulse-height analyzers, detector high-voltage power supplies, and rate meters. All are at least 20 years old and have become unstable over the course of operation. Newer components are not available because ETEC is no longer in business. The old components will be replaced with modern off-the-shelf components and the electronic feed-throughs will be modified to accept these new components. These upgrades will indefinitely extend the lifetime of the instrument, increase instrument stability, and allow for easy repair. The existing light optical microscope will be supplemented with a video system consisting of a video camera, monitor, image-capture board, and PC. This upgrade will enhance teaching and training capabilities of the machine appreciably, allowing a number of people to simultaneously observe analytical operations. The image-capture system will allow accurate real-time records of the locations of analyzed points to be generated. The lab serves the northern Arizona and southern Nevada region and is used by faculty from the Departments of Anthropology and Geology at Northern Arizona University, the Department of Geology at the University of Nevada, Las Vegas, and researchers from the U.S. Geological Survey Flagstaff Field Office, and the Navajo Nation Archaeology Department. The lab supports varied research in igneous and metamorphic petrology, archaeology, and anthropology.***