Note: As an example, this equation is for calculating concentration of Rb, but the basic equation can be used for any system.
ConcN = the Concentration of the sample (what you want to find out)
At. wt.N = the atomic weight of the sample (measured)
99.40/0.6 = the spike 87Rb/85Rb ratio (known)
R = measured isotope ratio (measured)
27.83/72.17 = natural 87Rb/85Rb ratio (known)
wt.s = mass of spike (measured)
wt.n = mass of sample (measured)
ConcS = concentration of spike (known)
At. wt.S = atomic weight of spike (known)
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