Old XRD Sample Insertion
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The early unit was manually fed samples. Note the brass ring which holds in
place the sample (a silver membrane filter containing a thin layer deposition of
particulate from an air sample). Samples are spun inside the unit to allow a
more uniform presentation of the sample to the x-ray beam. The silver is used as
an internal calibration on an intense silver diffraction line prior to a scan
for silica, allows an immediate assessment of instrument operation for each
sample, and denotes any absorption of x-rays via a decreased silver signal
intensity for an individual sample.
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