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In a mass spectrometer, the ion currents are measured using which of the following?

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In a mass spectrometer, the ion currents are measured using which of the following?

(a) Scintillation counter

(b) Ion counter

(c) Electrometer tube

(d) Electric fields

I had been asked this question by my school teacher while I was bunking the class.

The query is from Principle of operation of Mass Spectrometer in section Mass Spectrometer of Analytical Instrumentation

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The correct option is (c) Electrometer tube

The best I can explain: The ion currents are measured using a sensitive electrometer tube. The ions reaching the collecting plate are measured.

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