A method for determining lead isotope of extraterrestrial sample based on ion probe jump peak method

Abstract

The application discloses an extraterrestrial sample lead isotope determination method based on an ion probe jump peak method, belongs to the technical field of ion probe mass spectrum analysis and planetary sample isotope testing, and solves the problem that an existing determination method is not applicable to extraterrestrial samples and it is difficult to obtain accurate and reliable test data. The extraterrestrial sample lead isotope determination method adopts a single-receiver jump peak mode, combines a beam spot of different mineral scales, a scanning time and a cycle group optimization scheme, reduces the dependence on multi-receiver gain matching and a complex correction process, and reduces additional errors caused by receiver differences and small particle area changes. Through the secondary polishing and repeated screening steps for small particle size target minerals, the minerals with reduced cross-sectional areas are excluded, and false isotope ratio deviation caused by effective bombardment area changes in the jump peak analysis process is avoided. The application realizes the determination of the lead isotope of the extraterrestrial sample, and the test result is accurate and reliable.

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