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Which of the following components make use of a thin metal foil to isolate a nearly mono-energetic excitation beam?

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Which of the following components make use of a thin metal foil to isolate a nearly mono-energetic excitation beam?

(a) Transmission-anode X-ray tube

(b) Secondary fluorescence target

(c) Slit

(d) Filters

This question was posed to me in an internship interview.

My question is based upon X-Ray Fluorescent Spectrometer topic in chapter X-Ray Spectrometers of Analytical Instrumentation

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Best answer
Correct choice is (d) Filters

The best explanation: Filters make use of a thin metal foil to isolate a nearly mono-energetic excitation beam. Nickel is one of the metals that is used in filters.

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