An a bso lute valu e has bee n o btained for the isotopic ab un da nce rati o of te rrestria l rubidium , us in g sa Ud -sa mple the rma l ionizati o n mass spectro me tr y. Samp les of know n i'!otopic composition , prepa re d from nea rly isotopica Ll y pure se parated rubidium isotopes, we re used 10 calibrat~ the mass s pectrom e ters. The res ultin g a bsolute 85 Rb/ 87 Rb ra ti o is 2.592650. 00170 whi c h yie lds atom pe rcents of: ' Rb = 72. 16540.0132 and 87 Rb =27.8346 0.0132. Th e a tomic weight calc ulated fro m thi s isotopic co mposilion is 85.46776 0 .00026. The indi cated uncerta inties a re overa ll limits of error ba sed on 95 pe rce nt confide nce limits fo r the m ea n a nd a ll owa nces for the effects of know n so urces of poss ibl e syste m ati c e rror.
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Catanzaro et al. (1969) studied this question.
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