strait lins is a fumcticn of Wie beta enersy of the unimnown
isotope and the intercept of the line with the zero abserber
represents the relative amount of that isotope present in a
mixture.
The advantage of thie method lies in ita eppiicability to low
counting levels. This .s possible because the lings slope can
determined from light acsorbers rather than the heavy absorbe
required for Feather analyses. The method is in tentative us
for isotope characterization for mixtures of isotopes and sh
be applicable to determination of Sr°*/*° ratios.
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UNCLASSIFIED
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