centrifugal radius, \(r\)

https://doi.org/10.1351/goldbook.C00937
The radius at which a component is spinning at the end of the period of centrifugation. For a component sedimented from a dilute suspension, it can be equated with radius of rotation at the bottom of the centrifuge tube.
Sources:
PAC, 1994, 66, 897. (Quantities and units for centrifugation in the clinical laboratory (IUPAC Recommendations 1994)) on page 901 [Terms] [Paper]
PAC, 1996, 68, 957. (Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)) on page 965 [Terms] [Paper]