The determination of abundance in high abundance gas isotopes is an important step in the pro-duction of stable isotope products by centrifugation.In this study,a modified magnetic mass spectrometer was used to analyze the isotopic abundance characterization ions of each gas based on the spectra of xenon gas,germanium tetrafluoride,silicon tetrafluoride,and boron trifluoride after ionization in high abundance isotope samples.The Faraday cup and magnetic field positions were determined based on the motion char-acteristics of ions in the magnetic field.A mass spectrometry analysis method of isotopic abundance of xen-on,germanium,silicon,and boron in high abundance gas stable isotope samples(abundance greater than 99％)xenon,of germanium tetrafluoride,silicon tetrafluoride,and boron trifluoride was established.The measurement results indicated that the isotope with the highest abundance was 124Xe(99.955 4％),with a relative standard deviation(RSD)of 0.002％.The natural abundance of 76Ge in germanium tetrafluoride was concentrated from 7.8％to 99.071％,and the RSD of measurement result of each isotope was not greater than 1.6％(among them,the RSD of high abundance 76Ge was 0.01％).The abundance of 28Si in silicon tetrafluoride reached 99.989 5％,and the RSD of measurement result of each isotope abundance was not greater than 1.4％.The abundance of 11B in boron trifluoride reached 99.975 7％,and the maxi-mum RSD of 10B and 11B isotope abundance measurements was 0.17％.During the detection of abundance of gas stable isotopes,the increase of environment passivation process could effectively reduce the memory effect,especially in the determination of high abundance stable isotopes.
high abundancegas stable isotopemass spectrometry analysisxenongermaniumboronsilicon
NETL
NSTL
万方数据
