Fractionation corrections for mixed-isotope spikes of Sr, K, and Pb |
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| Authors: | Albrecht Hofmann |
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| Institution: | aLaboratorium für Geochronologie der Universität, Heidelberg ,Germany |
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| Abstract: | Methods are given to correct for isotopic fractionation in the determination of the isotopic composition of mixed-isotope spikes. The simplest method, applicable to Sr, utilizes the fact that the fractionated, measured isotope ratios of a critical three-isotope mixture lie exactly on a tie line that connects the true compositions of spike and normal element. Three-isotope elements that do not have critical mixtures require independent determination of the weight ratio of spike to normal element. A new analytic solution together with a straightforward graphical representation is given to the four-isotope problem. |
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