Exponential versus the power law

Consider the two most popular discrimination models the exponential and the power law  

To date, these two laws are the most commonly used for high-predsion isotopic analysis. However, these are not two different models, rather algebraic rearrangements of each other, much like expressions y = e and y=a Therefore, it is not at all surprising that publications aimed at statistical performance evaluation of these laws fail to report any difference between the two [18]. 

Russell s law [40], on the other hand, is not equivalent to the exponential mass bias correction model, although these two names are often used interchangeably. However, the difference in the correction factors for the two models is determined solely by the masses of all nuclides involved. Combining Eqs. (5.5) and (5.6) leads to the following  

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