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Which of the following is used in places where ion currents are very low?

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Which of the following is used in places where ion currents are very low?

(a) Faraday cup collector

(b) Channeltron

(c) Micro-channel plate

(d) Electron multiplier transducer

I had been asked this question during an interview.

I want to ask this question from Ion Transducers topic in section Mass Spectrometer of Analytical Instrumentation

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Right answer is (d) Electron multiplier transducer

Easy explanation: Electron multiplier transducer is used in places where ion currents are very low. Its primary cathode detects ions.

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