Shimadzu Corporation

Shuzo Hayashi

Isao Fukui

Apparatus for emission spectrochemical analysis of a sample containing elements to be analyzed, wherein the sample is cyclically excited with relatively high energy to vaporize the sample elements and successively with relatively low energy to cause the vaporized elements to emit light containing spectral lines characteristic of the elements, which spectral lines are detected by a plurality of photomultiplier tubes corresponding to the spectral lines, with a common negative high-voltage source connected to the dynodes of the photomultiplier tubes. The negative high-voltage source is controlled in such a manner that it supplies a negative high voltage to the dynodes of the photomultiplier tubes to activate the tubes only during the low-energy excitation of the sample.

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Kyoto, Japan

Shuzo Hayashi