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In absorption meter, which of the following is adjusted until the absorption of two X-ray beams are brought into balance?

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In absorption meter, which of the following is adjusted until the absorption of two X-ray beams are brought into balance?

(a) Collimator

(b) Filter

(c) Photomultiplier tube

(d) Attenuator

I got this question in an interview for internship.

I need to ask this question from X-Ray Absorption Meter topic in chapter X-Ray Spectrometers of Analytical Instrumentation

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The correct option is (d) Attenuator

The explanation: In absorption meter, the attenuator is adjusted until the absorption of two X-ray beams are brought into balance. A variable thickness aluminium attenuator is used.

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