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Which of the following happens when a large solid angle is intercepted as the detector is placed close to the sample?

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Which of the following happens when a large solid angle is intercepted as the detector is placed close to the sample?

(a) Maximum efficiency increases

(b) Maximum efficiency decreases

(c) Efficiency is not affected

(d) Process response becomes fast

This question was addressed to me in a national level competition.

Question is from Total Reflection X-Ray Fluorescence Spectrometer topic in portion X-Ray Spectrometers of Analytical Instrumentation

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Correct answer is (a) Maximum efficiency increases

Explanation: When the detector is placed very close to the sample, the maximum efficiency increases. This is because large angle is intercepted.

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