Sr double collector analysis

From the power law Eq. (10.7), we have the measured isotopic ratio ais 

The first scan uses Faraday cup 3 to measure Sr and cup 4 to measure Sr. On the basis of the cup efficiency factor (for cup 3 and for 

Similarly, with the second scan, the measured Sr/ Sr ratio is related to its true ratio by 

Note that mass fractionation factor 6 for power law and the cup efficiency factor K are completely cancelled out in (10.34). However, readers may find that if we use linear law or exponential law, the fractionation factors cannot be completely eliminated by division. 

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