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Non-sphericity parameter

The ratio of surface area of a sphere to that of a non-spherical body of equal mass, i.e. η = A0/A. (with regard to ellipsoids, such non-spherical shapes are defined by the body mass and the relative lengths of the minor and major axes). (ICRP Publication 108, 2008, para 96)

ICRP Glossary entry - May 2019

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