Titlebook: Worked Examples in X-Ray Analysis; R. Jenkins,J. L. Vries Book 1970 Springer Science+Business Media New York 1970 X-ray.spectrometry

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SMART

Continuous radiation — Scattered radiationThe continuous radiation from an X-ray tube is scattered by the sample, diffracted by the analyzing crystal and measured by the detector.

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Detector resolutionThe resolution . of a proportional counter is expressed in terms of the peak width at half height multiplied by 100, and divided by the value of the maximum pulse amplitude.

Arboreal

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Pulse height selection — crystal fluorescenceIt is necessary to set up an X-ray spectrometer for the measurement of sodium in a series of rock specimens. An argon/methane flow counter is being employed and a KAP (potassium hydrogen phthalate) analysing crystal. The rock samples contain quite a lot of calcium and this leads to strong crystal fluorescence.

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Choice of detectorsA A choice has to be made between the scintillation counter and the flow proportional counter for the measurement of a certain wavelength.

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Dispersion of the diffractometerThe dispersion of the diffractometer (dθ/dλ) can be expressed in the given form obtained by differentiating the Bragg law . = 2.sinθ.where the angular separation (dθ) of two wavelengths separated by (dλ) is expressed in terms of the diffraction angle θ for a certain spacing .. . is an integer which can be taken as equal to ..