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Which of the following crystals are not suited for x-ray grating?

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Which of the following crystals are not suited for x-ray grating?

(a) Topaz

(b) Lithium fluoride

(c) Calcium fluoride

(d) Sodium fluoride

I have been asked this question during an interview.

I'm obligated to ask this question of Instrumentation of X-Ray Spectroscopy in division X-Ray Spectrometers of Analytical Instrumentation

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The correct answer is (d) Sodium fluoride

For explanation: The crystal which is not suited for x-ray grating is sodium fluoride. Other crystals which are suitable for x-ray grating are gypsum and sodium chloride.

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