Deternination of Isotopic Ratio of Lithium By Cumulative Method of Ion Curren Intensity

A method by cumulative intensity of ion current to analyse isotopic ratio is proposed in present paper. The isotopic ratio of lithium was determined by cumulating intensity of ion current during evaporation of all samples on evaporation filament. Isotopic mass fractionation has no effect on results almost by using this method. Isotopic fractionations of normal method and the method of cumulative intensity were discussed.