The Oregon State University Electron Microprobe Laboratory, located in Burt 150, utilizes and maintains a Cameca SX-100 Electron Microprobe equipped with 5 wavelength dispersive spectrometers (WDS) and one energy dispersive spectrometer (EDS) with thin window for light element detection. The probe has high intensity dispersive crystals for high sensitivity trace element analysis, and a high precision sample stage with 0.1 um stepping capability. The probe is equipped with Cameca Peak Site analysis and imaging software. The SX-100 is capable of quantitative analyses from Z = 4 (Be) to 92 (U) uranium. It has the capability for high-resolution elemental mapping and trace element analysis at low concentrations (generally to 100’s of ppm). The probe has a high speed back scattered electron (BSE) imaging system, transmitted and reflected light imaging, and automated calibration and analysis. The Electron Microprobe Laboratory maintains a wide range of in-house calibration standards for quantitative analyses of silicates, sulfides, carbonates, oxides, and alloys.