Abstract: A Method for the Mass Spectrometric Measurement of Low Abundance IsotopesZhao Motian(National Research Center For CertifiedReference Materials, Beijing 100013, China)Abstract:For low abundance isotope measurement, a rational mass spectrometry have beendiscussed. Pathways to increase abundance sensitivity have described, and the progressof measurement technology has been pointed out.' i:.yKeywords: abundance sensitivity, elastic collision, inelastic collision, scattering, tail peak.