JEOL 8900 Micro Probe
located at the USGS facility in Menlo Park, CA.

Contact information:
Robert Oscarson
(650) 329-5117
roscarson@usgs.gov


The JEOL 8900 Superprobe has 5 wavelength dispersive spectrometers (WDS) an energy dispersive spectrometer (EDS) and a Hewlett-Packard workstation. Quantitative chemical analysis is done on solid materials and typically for silicate rocks, e.g. minerals in polished thin sections or grain mounts. Analysis area is 2 to 100 micrometers. The system can produce images in reflective light, secondary electron or backscattered electron mode. A typical 10 element condition will take 3-4 minutes to complete depending on measurement times. The automated system allows the user to save each analysis site, up to 999, as a coordinate. The sites are recalled and quantitative analysis is performed un-attended.