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Using which of the following components is the generated x-rays focussed upon the specimen?

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Using which of the following components is the generated x-rays focussed upon the specimen?

(a) X-ray tube

(b) Monochromator

(c) Collimator

(d) Detector

This question was addressed to me during an interview for a job.

The question is from Instrumentation of X-Ray Spectroscopy topic in section X-Ray Spectrometers of Analytical Instrumentation

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Correct choice is (c) Collimator

Easiest explanation: Collimator is used to focus the generated x-rays upon the specimen. The collimator is in between the specimen under analysis and the Coolidge tube.

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