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An absolute value for t he isoto Di c abu ndance ratio of II reference sample o f copper has bee n obtained b y thermal emission mass spectrometr y . Samples of known abundance ratio, prepared from n earl y pure separated copper isotopes, were used to calibrate the mass s pectromet ers. The results y ield an absolute valu e of CU 63 / CU 65 = 2.2440 0.0021 and an ato mic weight of 63.54555 0.00040 (C 12= 12). The indicated uncertai n ties are overall limits of error based on 95 perce nt co nfidence limits for the mean and on all owances for the effects of known so urces of possible systemati c error.
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Shields et al. (1964) studied this question.
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