Isotopic Analysis of Lead with Mass Spectrometer

概要

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In this paper a new design of a simple ion source of mass spectrometer for solid material, and the techniques as well as the results of the experiments on the isotopic analysis of lead are introduced. The instrument is the Hitachi mass spectrometer, Type RMU-5. Slight changes are made on the ion source for gas analysis. The repeller electrode is a thin Platinum plate and can be heated by electron bombardment from the rearside. After the sample is mountedon the front side of the repeller electrode, the electrode is assembled the ion source. The sample is vapourized and ionized by electron impact. The results obtained with the natural lead were consistent with those by others. The analysis of the lead in Enaliteat Gifu Prefecture gave the following results: 204Pb-0.96%, 206Pb-24.98%, 207Pb-21.28%, and 208Pb-52.77%. The age of this mineral was estimated to be about 5×107 years. This ion source can be conveniently used for solid materials which are vapourized at moderate temperature.
日本質量分析学会の論文