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In Atomic Absorption Spectroscopy, which of the following is the generally used radiation source?

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In Atomic Absorption Spectroscopy, which of the following is the generally used radiation source?

(a) Tungsten lamp

(b) Xenon mercury arc lamp

(c) Hydrogen or deuterium discharge lamp

(d) Hollow cathode lamp

I got this question by my college professor while I was bunking the class.

My question is taken from Atomic Absorption Spectroscopy in section Colorimetry and Spectrometry of Analytical Instrumentation

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Right choice is (d) Hollow cathode lamp

To elaborate: Hollow cathode lamp is the source used in Atomic Absorption Spectroscopy. It emits stable and intense radiation.

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