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In absorption meter, which of the following is placed between the chopper and the reference cell?

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In absorption meter, which of the following is placed between the chopper and the reference cell?

(a) Collimator

(b) Filter

(c) Photomultiplier tube

(d) Attenuator

This question was addressed to me in an interview for job.

This is a very interesting question from X-Ray Absorption Meter in chapter X-Ray Spectrometers of Analytical Instrumentation

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Right answer is (d) Attenuator

To elaborate: In absorption meter, attenuator is placed between the chopper and the reference cell. A variable thickness aluminium attenuator is used.

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