Adaptation of the X-Ray Milliprobe for the Examination of Small Single Crystals Obtained from Lunar Samples

Authors: Evans, Howard T.; Christian, Ralph P.

Source: Applied Spectroscopy, Volume 26, Issue 2, Pages 173-315 (March/April 1972) , pp. 313-315(3)

Publisher: Society for Applied Spectroscopy

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Abstract:

In this laboratory the x-ray milliprobe apparatus is in standard use for the analysis by x-ray fluorescence under x-ray excitation of samples as small as 1 mm in a flat specimen section. The instrument is a General Electric model XRD6 semifocusing spectrometer. In the holder the specimen is bathed in intense tungsten (or chromium) radiation from a type EA-75 dual target x-ray tube and the excited radiation is collimated by a 1-mm beam tunnel. The collimated x-radiation is then analyzed with a curved LiF crystal and detected with a flow proportional counter. Four different analyzing crystals are available to provide optimum focusing over a wide range of wave-lengths. The apparatus and procedure have been described by Rose et al.

Keywords: Crystallography; Lunar investigations; X-Ray spectroscopy

Document Type: Short Communication

DOI: http://dx.doi.org/10.1366/000370272774352416

Affiliations: U. S. Geological Survey, Washington, D. C. 20242

Publication date: March 1, 1972

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