For a discussion of the meaning of 'natural composition', see Pure Appl. Chem., 37, 591-603 (1974). In any context where the accuracy requires it, the natural nuclide composition
used should be stated.
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(Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.
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