Abstract
Abstract Mass spectrometric analysis of thorium is of great interest to geo-scientists and nuclear technologists. Though thorium is considered to be a mono-isotopic element for all practical purposes, the 230Th/232Th isotopic ratio provides useful information for various applications, e. g. dating of corals, build-up of 232U during reactor irradiation, etc. Among the gamut of mass spectrometric techniques available for the isotopic analysis of different elements, thermal ionization mass spectrometry, inductively coupled plasma mass spectrometry and secondary ion mass spectrometry are more commonly used for Th analysis. The problems of blank contribution and poor ionization efficiency of thorium, which are more serious in thorium mass spectrometric analysis, are discussed. The present state of the Th mass spectrometry is highlighted, with the futuristic increased use of thorium in energy production, in focus. The need to prepare and make available the certified isotopic reference materials for 230Th/232Th isotope ratios is emphasized.
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