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Please note all users MUST view the X Ray Safety Slideshow (email jharris@pomona.edu for the link)
Please note all users MUST view the X Ray Safety Slideshow (email jharris@pomona.edu for the link)
Users must also complete the General X Ray Safety Quiz, along with the XRF specific X Ray safety quiz before using the instrument.
Users must also complete the General X Ray Safety Quiz, along with the XRF specific X Ray safety quiz before using the instrument.
The quizzes are at the bottom of this page
The quizzes are at the bottom of this page
The calendar below shows user times which have already been scheduled.
Please contact Jonathan Harris (jharris@pomona.edu) to schedule sample preparation and instrument time
How to find us:
The Geology Department's XRD lab is located in Edmunds Hall at 185 E 6th St, Claremont
The Lab houses a Panalytical Axios X-Ray Fluorescence Spectrometer which can analyse both fused glass and pressed powder samples.
Sample preparation is typically conducted within the Geology Department (a brief overview of preparation techniques is given below and detailed instructions are also available for download).
Please contact Jonathan Harris (jharris@pomona.edu) with any questions. Please be aware that we do not offer commercial analyses of any kind.
The XRF Lab is funded by the Course, Curriculum, and Laboratory Improvement (CCLI) program of the National Science Foundation's Division of Undergraduate Education, Pomona College, and the Departments of Geology and Chemistry.
Sample Preparation:
Sample Preparation:
Glass beads are prepared using a 2:1 dilution of sample and di-lithium tetraborate flux, using a double fusion method in graphite crucibles, following methodology developed by the University of Washington. This allows for simultaneous analysis of both major and trace elements. This method is used primarily for rock samples.
Pressed powder samples are typically prepared using a 4:1 mixture of sample and a cellulose binding agent, which are compressed in aluminum cups using a 30 ton hydraulic press. The pressed powder method allows for analysis of trace elements only.
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