A STUDY ON THE DETERMINATION OF STRONTIUM ISOTOPIC RATIO BY THERMAL IONIZATION MASS SPECTROMETRY SINGLE AS WELL AS MULTIPLE FILAMENT ASSEMBLY

摘要

The experiments conducted were an effort to understand the vaporization and ionization phenomena using two loading assemblies. The two loading assemblies show different vaporization behaviour for strontium which is reflected in the mass discrimination factor. Multiple filament assembly gives more stable observed atom ratio than single filament, loading assemblies for strontium. Multiple filament loading assemblies is better suited than single filament for analysis in presence of impurities. The advantage of single filament, which is, lower cost of analysis cannot be overlooked, especially in the case of Sr where internal normalization takes care of fractionation effects. However, stringent analysis conditions are-required for analysis of low amounts of Sr to avoid high fractionation.