A demountable water-cooled hollow-cathode lamp for general use as a sharp-line source in atomic-absorption spectroscopy is described. The effective removal of the atomic vapors from the mouth of the cathode and the consequent possibility of raising the discharge current are stressed. The lamp has worked satisfactorily for 1 yr for 13 elements. Sensitivities either comparable to or exceeding those obtained with conventional tubes were observed.

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