A Study on Re-Os Chemical Separation Method for NTIMS

We developed a new Re-Os chemical separation method that is suitable to NTIMS. The method included alkaline fusion, twice distillation,a micro distillation for Os that had lmproved ion-current to 2 magnitudes and extraction, cationexchange, micro anionexchange for Re. The Re-Os age of newly deve1oped Re-Os age reference HLP by this method was 223. 4±1. 5 Ma.