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A crystal monochromator contains which of the following material?

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A crystal monochromator contains which of the following material?

(a) X-ray beam detector

(b) A very small crystal

(c) Crystal electrode

(d) Large single crystal

This question was posed to me during an interview.

This key question is from Modern X-Ray Powder Techniques and their Applications in section X-Ray Diffraction of Solid State Chemistry

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Best answer
The correct choice is (d) Large single crystal

The best explanation: A crystal monochromator consists of a large single crystal of for example quartz oriented such that one set of planes which diffracts strongly for quartz is at the Bragg angle to the incident beam.

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