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Which of the following is used to cool the ion source?

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Which of the following is used to cool the ion source?

(a) Liquid sodium shield

(b) Liquid nitrogen shield

(c) Water

(d) Freon

I had been asked this question in unit test.

This interesting question is from Quadrupole Mass Spectrometer in chapter Mass Spectrometer of Analytical Instrumentation

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Correct choice is (b) Liquid nitrogen shield

Explanation: Liquid nitrogen cooled shield is used to cool the ion source. It reduces source contamination.

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