<研究報告>質量分析計 JMS-D300 による同位体比測定について

概要

論文の詳細を見る
The JMS-D300 mass spectrometer, virtual image ion optics machine, originally designed for identification of organic materials, has been modified to that for determination of isotopic ratios of elements. The reason, why it is necessary to alter JMS-D300,has been explained connecting with the present purpose, mainly cosmochronological studies, of measuring siotopes. Improvements has been performed more or less to all parts such as ion source, analyzer tube, collector system, magnetic scan system and vacuum system, of JMS-D300. By means of actual isotopic measurements of K, Ca and Cr, performance of the modification was examined and results were described in detail. In present status, fundamental points such as source assembly alignment, sensitivity, resolution, magnetic scan system and collector system are almost completely satisfactory for measurement of normal isotopic ratios of elements. However, for measurements of trace amount of samples, and of a very small peak between large peaks and for much accurate and precise measurements, it is necessary to make further improvements.
国立科学博物館の論文