electron microprobe


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electron microprobe

[i′lek‚trän ′mī·krō‚prōb]
(physics)
An x-ray machine in which electrons emitted from a hot-filament source are accelerated electrostatically, then focused to an extremely small point on the surface of a specimen by an electromagnetic lens; nondestructive analysis of the specimen can then be made by measuring the backscattered electrons, the specimen current, the resulting x-radiation, or any other resulting phenomenon. Also known as electron probe.
References in periodicals archive ?
Figure 6 highlights three representative images of exterior shell surfaces of the same left valves used for electron microprobe analysis.
The subject of the contract is the acquisition of the electron microprobe, used for chemical microanalysis of solid phases (mainly geological samples) by wavelength and energy dispersive x-ray spectrometry (esd, wds) and to study samples by scanning using a wide range of imaging techniques (bse, se, cl ) in very high resolution.
A scanning electron microprobe analysis has been completed on a suite of core and rock samples to specifically identify the vanadium mineralogy.
The section on petrology includes a diverse suite of articles that cover apatite in igneous systems (Piccoli and Candela), apatite, monazite, and xenotime in metamorphic systems (Spear and Pyle), electron microprobe analysis of the aforementioned (Pyle, Spear, Wark), and sedimentary phosphates (Knudesen and Gunter).
He started specializing in the Electron Microprobe (EPMA) at the Solar Energy Research Institute in 1981, where he performed research evaluating emerging materials for photovoltaic applications.
5 kg, were crushed and separated into heavy mineral concentrates (HMC) from which garnet, clinopyroxene, orthopyroxene, olivine, ilmenite and chromite indicator minerals were picked and analysed by electron microprobe at a commercial laboratory.
Two types of analysis were used: X-ray fluorescence and electron microprobe.
Initial work on the pegmatite by the OGS and The Open University of the United Kingdom consisted of two field seasons of study, 1648 electron microprobe analyses, 50 bulk chemical analyses, 21 analyses of potassium feldspar and X-ray diffraction work conducted upon 30 samples.
The combination of visual sorting and quantitative X-ray analysis using the electron microprobe permits most artefacts to be quickly and inexpensively analysed.
Mineral compositions were determined on an automated CAMECA electron microprobe with accelerating potential set at 15 keV and sample current at 15 na, with a beam diameter of 10 mm.
The cake is examined for inclusions by metallographic and constitutional analysis that may include optical, electron microprobe and energy dispersive techniques.

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