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.
PAC, 1994, 66, 897. 'Quantities and units for centrifugation in the clinical laboratory (IUPAC Recommendations 1994)' on page 901 (https://doi.org/10.1351/pac199466040897)
PAC, 1996, 68, 957. 'Glossary of terms in quantities and units in Clinical Chemistry (IUPAC-IFCC Recommendations 1996)' on page 965 (https://doi.org/10.1351/pac199668040957)