https://doi.org/10.1351/goldbook.14593
Ratio measuring the degree of isotopic discrimination, with a ratio of 1 indicating no discrimination.
Note: In the context of discrimination between elements such as cesium and potassium in a trophic exchange, a discrimination factor or ratio is expressed as \([\ce{Cs}]_{\rm{food}}/[\ce{K}]_{\rm{food}}\) divided by \([\ce{Cs}]_{\rm{body}}/[\ce{K}]_{\rm{body}}\).