Absolute isotopic abundance ratio and the atomic weight of bromine

Abstract

An absolute value is obtained f<?r the isotop~c ab undan ce ratio of bromine us ing thermal emtSS lon mass spectrometers cahbrated for bws by the use of sa mples of known isotopic compos ltwn prepared from nearly pure separated bromine isotopes.The res ult in g absolu te 13r79/13r81 ratI,D, IS 1.02784 ± 0.00190 which yield s an atomic weight (CI2 = 12) of 79.90363 ± 0.0009.2 . .I he l.Ildlcated uncertainties are overall limi ts of error based on 95 percent confid e nce lunl ts for t he mean and allowances for t he effects of known so urces of possible sys-tematIC error plus a coml?onent to cove r poss ible natural variations in isotopic compos ition a lt hough no provable varIatwns were noted among t ile 13r79/13r81 ratios of 29 commercial and naturlll sa mples.Mass s p ectr?m et ri c determination s of th e atomic weights of bromin e and s il ver gIve a comb inin g weight ratio of Ag13r/ Ag = 1.740752.

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