IN a recent communication1 it was concluded that a boron 11/boron 10 ratio of 4.00 approaches the true natural abundance ratio much more closely than the presently accepted value of 4.31. This value of 4.00 had been obtained from the mass spectra of boron hydrides and other volatile compounds.
Lehmann, W. J., and Shapiro, I., Nature, 183, 1324 (1959).
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NEWTON, D., TYRRELL, A. & SANDERS, J. Isotopic Composition of Boron. Nature 184, 185 (1959). https://doi.org/10.1038/184185a0
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