The formula to calculate the isotope ratio (ISR) is:
\[ ISR = \frac{I}{RI} \]
Where:
An isotope ratio is the ratio of the quantity of one isotope to the quantity of a reference isotope. This ratio is used in various scientific fields, including geology, chemistry, and environmental science, to study processes and changes in natural systems.
Consider an example where:
Using the formula to calculate the isotope ratio:
\[ ISR = \frac{50}{25} = 2 \]
This means that the isotope ratio for this example is 2.